HVAC Heating Coils / Cooling Coils

H-Mac Systems is Boston Massachusetts HVAC heating coil and cooling coil replacement specialist.

We represent a complete line of HVAC heating and cooling coils including; hot water coils, chilled water coils, dx refrigerant coils, glycol coils and steam coils.

Whether it's a basic duct booster coil, hot water heating coil, or a custom 12 row chilled water replacement coil for a seaside application, we can meet all of your specifications.

Common HVAC coils. (Image)

To obtain pricing on replacement heating coils and cooling coils:

Step 1) Choose the coil section below that best meets your requirements and download the appropriate template. If it's easier, take a digital picture or draw a sketch of your existing coil. Provide as much information you can. The more information you provide, the closer we can match your requirements. We do not need every last detail to generate an estimate. HVAC Coil pricing is primarily dictated by the finned surface area and the number of rows. We will confirm the important fit-up dimensions before entering your coil into production.

Step 2) Fax or e-mail us your completed template, digital pictures or sketches:
               Fax: 978-222-8448 E-mail: sales@h-mac.com

Step 3) Upon receipt, we will run detailed coil selections and send you a quotation with all of the available production cycles. If we can meet your application with a stock coil, we will quote you the stock coil.

Step 4) If you decide to order the coil, we will provide you with a detailed submittal package for your review and approval before entering the coil into production.

Do you need an exact match and you're not comfortable taking your own dimensions? We have solutions!

1) If you are in the New England area, we would be happy to visit your site.

2) If you are outside the New England area, ship us your coil, and we will build an exact match.

Do you need a replacement coil fast?

Our manufacturers can build almost any coil on an emergency 3 day production cycle. Add 3-4 days for standard ground shipping, or we can quote you on overnight expedited freight.

Are you bidding a plan and spec. project?

We don't just specialize in replacement heating and cooling coils. Our manufacturers are very competitive in the plan and spec. market. We can get to the price levels you need, and our submittal packages are quick and accurate.

HVAC Booster Coils

A booster coil is a basic hot water or steam heating coil used to "boost" the temperature in a ducted HVAC system. If you are looking for a quick duct coil, and your dimensions do not have to be exact (you have flexibility in sizing or transitioning your ductwork), the booster coils are quick and inexpensive. Our manufacturers have many booster coils in stock. Most sizes are available for shipment in 3 days. Plan an additional 3-4 days for standard ground delivery, expedited delivery methods are available. If we do not have a size that will work, a custom coil will be quoted, along with several different production cycle options.

Hot water coil with aluminum fins, copper tubes and galvanized casing. (Image)

We offer a wide variety of booster coils.
• 66 Standard 1 and 2 row sizes.
• 30 Sizes available 1 and& 2 row headered.
• 5/8" OD copper tubes with .020 wall staggered tube pattern.
• 6 to 14 Fins per inch.
• 16 gauge galvanized steel casings with 1" flanges on the end plates and side plates.
• All coils are leak tested under water at 450 PSIG dry nitrogen.
• All coils are built to ARI-410 standards.
• All coils suitable for steam up to 5 PSI.

DOWNLOAD TEMPLATES

Booster Coil Template Download

Slip and Drive Booster Coil Template Download

HVAC Built-To-Order Coils

If a booster coil won't work, we can match any coil with our custom coil product offering. Standard production cycles are 3-5 weeks, depending on current factory loading and the materials selected. If you need it faster, we also offer 3, 2 and 1 week production cycles.

Common chilled water coil with aluminum fins, copper tubes and galvanized casing. (Image)

Common Custom Coils
• 3/8", 1/2" and 5/8" OD Tubing.
• Complete Line of Standard and Custom Built Coils.
• Chilled Water Cooling Coils.
• Hot Water Heating Coils.
• DX Evaporator Coils.
• Heat Reclaim Coils.
• Condenser Coils.
• Standard On/Off Steam Coils.
• Non-Freeze Steam Distributing Coils.
• Booster / Duct Mounted Coils.
• 4-16 Fins per Inch.
• .006 Enhanced Plate type aluminum.
• Copper and other specialty materials available.
• Hand brazed with silver bearing alloys.
• Every coil is leak tested under water with 550 PSIG dry nitrogen for 100% quality assurance. (Meets UL Burst Test)
• Custom crating for oversized coils.
• Custom coatings and materials are available.

DOWNLOAD TEMPLATES

Condenser Coil Template Download

DX Coil Template Download

Intertwined DX Coil Template Download

2 Position on/off Steam Coil Template Download

2 Position on/off Steam Coil with Opposite End Connections Template Download

Modulating Non-Freeze Steam Coil Template Download

Chilled Water Coil and Hot Water Coil Template Download

HVAC Cased Cooling Coils

Do you need a cased cooling coil with an integral drain pan? We offer one of the best solutions. Air handling unit manufacturers can sell you a coil "module", but they are expensive and limited by their pre-determined cataloged frame sizes. We can pick the best cooling coil for your application, and then simply encase the exact coil you need. Standard drain pans are galvanized, stainless steel drain pans are available:

To get pricing on a cased cooling coil, use the standard cooling coil templates and note that a full casing is required. Tell us if you would like a galvanized or stainless steel drain pan.

Typical cased coil with integral drain pan. (Image)

How To Measure Your Existing Coil

Helpful Hints for Measuring Your Existing Coil:

1) You rarely have to worry about performance on a replacement coil. If you duplicate the materials, face area, fins, and circuiting on a coil, then you automatically duplicate the performance.

2) When you replace an old dirty coil the new coil will typically give you 30%-50% more performance than the dirty one.

3) Connection sizes and locations are the most difficult part of the coil to measure, especially if the coil is buried inside a dark air handling unit. You only have to get the connections in approximately the same location. When a coil is replaced, a section of piping is easily replaceable.

4) You can make a coil last 100% longer by simply increasing the wall thickness of the tubes and return bends. The cost to do this often is less that20% of the coil.

5) Pricing a coil doesn’t require exact measurements. Give us the coil type,number of rows, fins per inch, height and length.

HVAC Coil Dimension Nomenclature

If you would like to learn more about the dimensions found on our coil templates, detailed descriptions can be found here.

Rows - Also known as the number of "passes" back and forth across the face of the coil. A 2 row coil with same end connections would go across the face of the coil in one direction, and then turn around at the u-bends, and come back in the opposite direction.
• Horizontal rows of tubes in the fin pack (Typical Row Depth)
• Chilled Water and DX Coils – 3 to 12 rows
• Hot Water Coils – 1 to 3 rows
• Steam Coils – 1 to 2 rows
• Condenser Coils – 1 to 8 rows

FPI - Fin density, measured in how many fins per inch.
• 1/2" OD tube coils - 11 to 18 fins per inch
• 3/8" OD tube coils - 10 to 18 fins per inch
• 5/8" OD tube coils - 6 to 14 fins per inch
• Standard fins are .006" die formed aluminum with collared tube holes
• Optional fins are .008 and .010" aluminum and .006" copper
• Contact us for special fin materials and fin coatings

FH – Fin Height. Fin height does NOT include the casing flanges.
Fin heights are dictated by tube patterns
• For 5/8" tube coils, fin heights are available in increments of 1.5"
• For 1/2" tube coils, fin heights are available in increments of 1.25"
• For 3/8" tube coils fins are available in 1.00" increments

FL – Fin Length. Fin length does NOT include the casing flanges.
Fin length can be any size. Center supports (also called tube supports) are required for every 50" of fin length. A center support is sheet metal with tube holes used to support the middle of the fin pack.

SP1, SP2 – Sideplate Flanges
• Standard flanges are typically 1-1/2" and stackable. Minimum stackable flange is 1/2"
• Inverted, flat sideplate flanges are typically 1" and Casing Height (CH) is increased on both sides by the 1/16" thickness of the metal (e.g. 9" Fin Height + Inverted Flat Side Plates = 9 1/8" Casing Height)
• Available casing materials are 16 gauge galvanized steel and 16 gauge stainless steel

Contact us for other casing materials

FAQ: Why are top and bottom flanges called side plates?

ANSWER: When the coil machines are expanding the tubes to the fins at the factory, the coil face lays flat on the table, so the top and bottom flanges are actually viewed as side plates.

EP1, EP2 – End Plates (also called tube sheets)
• Standard flanges are usually 1 1/2" and made of 16 gauge galvanized steel
• 16 gauge stainless steel end plates are also available

CH – Casing Height. Overall height of the complete assembly.
• For coils with stackable flanges, casing height is calculated as follows:
CH = SP1 + FH + SP2
(e.g. SP1 = 1.5, FL = 30, SP2 = 1.5)
CH = 33
• For inverted flat casing, casing height is calculated as CH = FH + 1/8

CL – Casing Length. This does NOT include u-bends and headers.
CL = EP1 + FL + EP2

CD = Casing Depth
Standard coil casing depths are as follows:

NOTE: These dimensions were chosen to ensure that headers remain inside the casing, however; modifications can be made as long as:
The CD is greater then the fin pack:
Where CD is the casing depth
Fin pack = (No. Rows) X (Centerline Distance between Rows)

Max
• MAX is the dimension from the edge of the fin pack to the outside of the return bend. A return bend is simply a bent copper tube connecting two adjacent rows
• Minimum MAX dimension is 1.5"
• Typical MAX dimension is 2.25"
Sometimes the flange, EP1 exceeds the MAX dimension. In such a case, substitute the MAX dimension with EP1

"C" Dimension
• "C" is the dimension from the edge of the fin pack to the outside of the header. For opposite end connection coils, there would be two "C" dimensions – C1 and C2. Attached to the header are copper tubes or "adapter" tubes which connect the coil tubes to the header
• Standard adapter tube lengths are 3 1/8" and 1 7/8"

example: Coil has a 1 1/8" header with 3 1/8" adapter tubes

C = 1 1/8 + 3 1/8 = 4 3/8

NOTE: All double circuit coils to have a minimum adapter tube length of 3 1/8".

OAL – Overall Length
• For same end connection coils, overall length is the dimension from the edge of the return bends on one end to the outside of the header on the other end.
OAL = MAX + FL + C

example: MAX = 2 1/4 + FL = 48 + C = 4 3/8; OAL = 54 5/8

• For opposite end connection coils, overall length measures from the outside of the header on one end to the outside of the header on the opposite end.
OAL = C1 + FL + C2

example: C1 = 3 1/8 + FL = 48 + C2 = 3 1/8; OAL = 54 1/4

NOTE: that connection length "L" is not included in the "OAL" dimension. The L dimensions are the supply and return pipes that typically protrude from the ductwork or air handling unit.

L-Connection Length
• Coil connections are typically copper or steel. Copper connections can be made any length down to a certain minimum.
• Steel Connections have fixed lengths as shown in the chart below.
• Standard connection types for various Precision Coils :
• Water and Steam Coils – Copper MPT connections (with option for Copper FPT or Steel MPT connection).
• DX Coils – Supply connections are brass distributors with removable type orifice and an optional side port connection for hot gas bypass. Suction headers have Copper SWEAT connections.
• Condenser & Heat Reclaim Coils – Copper SWEAT connections.

Typical Connection Lengths for Standard OD Connection Sizes

Connection Sizes-Header Diameters
•As shown in the chart, standard MPT and FPT connection diameters (OD’s) range from 3/4" to 3". Contact factory for special connection sizes.
• For water coils, connection sizes are typically sized based on GPM of water.

For SWEAT connections and header diameters add, 1/8" to the standard connection size.
Header OD = Connection Size + 1/8"
Sweat Connection = Connection Size + 1/8"
(e.g. Coil with 1" MPT connections, header OD = 1 1/8"

Exceptions: Non-Freeze Steam Distributing coils have fixed header diameters regardless of connection size.

1 Row Steam Dist. Coil = 2 5/8" OD Header, unless supply is 3" then header is 3 1/8".
2 Row Steam Dist. Coil = 3 1/8" OD Header

"S" and "R" – Connection Locations
Connection locations may vary according to whether you are replacing an existing coil or designing a new coil. For Precision Coils, standard connection locations "S" and "R" are determined from the centerline of the connection relative to the top & bottom of the casing.
• Typically, for Water Coils, Standard Steam, Direct Expansion, & Condenser Coils
•S or R = 1/2 (Conn size OD) + .5
(e.g. Conn Size = 2, S = 1.5)
- Typically, for Steam Distribution Coils
S + 1/2 (Casing Height)
R + 1/2 (Conn Size OD) .5

"E"and "F" – Connection Locations
"E" & "F" dimensions are determined from the centerline of the connection relative to the sides of the casing. These dimensions are probably the most "mysterious" of all coil dimensions, for they are dependent on many factors – number of rows, tube pattern, header diameter, type of offset adapters available, etc.

The following schematic and respective formulas should help in calculating "E"and "F".

X = (No. Rows –1) * (Distance between rows)
For 5/8" tube coils distance between rows = 1.30
For 1/2 " & 3/8" tube coils Dist. Between rows + 1.08
For 1 row coils – "E" and "F" = 1/2 (CD) +/- (Offset Option)
For 2-12 row coils - "E" and "F" = 1/2 (CD – X+ +/- (Offset Option)
Note: Offset Option - Offset adapters are required if the header diameter is greater than the dimension "X".
Standard offsets for Precision Coils
5/8" tube – 0.75, 1.30, 2.05, 2.60
1/2" tube – 1.08, 2.16

NOTE: All standard offset adapters are 3 1/8" long
We can provide special offset adapters if required. For special offsets contact the factory.

Common HVAC Coil Specifications

Common coil specifications. Give us a call if you don’t find what you’re looking for in these common coil specifications.

Fin Materials
.006, .008, and .010"
Aluminum, copper and custom coatings

Fin Spacing
1/2" OD Tubing - 10 to 16 fins per inch
5/8" OD Tubing - 6 to 14 fins per inch
3/8" OD Tubing - 10 to 20 fins per inch

Tube Material
3/8" OD x .016" Wall -Copper
1/2" OD x .016", .020" Wall - Copper
5/8" OD x .020", .025", .035", .049" - Copper

Casings
16, 14, 12, Gauge Galvanized Steel
16, 14, 12, 10 Gauge 304 and 316 Stainless Steel
Aluminum, copper and special coatings

Headers
Type "L" or "M" from 7/8" OD to 4 1/8" OD Copper

Connections
Water and Steam Coils – Copper, Steel, or Brass
MPT or FPT Connections
DX Distributors – Standard or Hot Gas
DX, Condenser and Heat Reclaim – Copper Sweat Connections
Supply Connections on both ends of Steam Distributing Coils

Testing
All coils are leak tested under water at 450 PSIG dry nitrogen

Other Options
Non-Standard Casing Flange Widths and Casing Depths
Special Coil Coatings
Additional Distributors
Non Standard Circuiting
Intertwined Circuiting (DX Only)
Quick ships

Typical Installation Recommendations for HVAC Coils

This section covers the basic installation, operation and maintenance recommendations for HVAC heating and cooling coils.

Always follow local codes and standards for the installation of equipment and coils for the area in which the coils are to be operated. Following are recommendations for the installation of products manufactured by Precision Coils. Please read this manual completely before installing and operating coils manufactured by Precision Coils including the suggested maintenance. Care should be taken when handling Precision Coils to avoid damage or personal injury.

Failure to observe these recommendations could result in premature failure of the product and / or loss of the warranty provided. Precision Coils will repair or replace any product determined to have failed due to a manufacturing defect after proper evaluation of the product and installation methods have been completed. Please see complete Warranty Statement below.

Precision Coils reserves the right to request information concerning the installation of products it manufactures and / or the return of failed products to our facility for evaluation of the failure before any warranty will be considered.

A Return Authorization Number (RA#) must be requested before the coil is returned to our manufacturing facility. Any product returned without RA # will not be accepted and all charges for the shipment of the coil will be the shipper's responsibility. The product must be crated such to prevent any damage from occurring during shipment. Any product without sufficient crating that allows damage to the product to occur will not be accepted and no warranty will be provided.

Warranty

The Seller warrants to the original user of its manufactured product against defects in material and workmanship for a period of one year from the date of shipment provided the equipment has been correctly installed, applied, and operated under intended design conditions. The Seller's obligation under this warranty is limited to repair or replacement, at Seller's option, of any product, that upon Seller's examination at its factory shall appear to have become defective. Correction of such defects by repair or replacement, plus return freight via lowest common carrier, shall constitute fulfillment of obligations to the buyer. The Seller will accept no expense, liability, or responsibility for repairs made outside the factory by others without prior written approval. In any event and at no time shall the expenses or liabilities arising from the sale of the equipment by the Seller exceed the original net cost of the material sold. Warranty covers material only and not labor required to replace or install.

Water Coil Installation Recommendations

1. Piping should be in accordance with accepted industry standards. Always use a back up wrench on the coil connections when attaching the piping to the coil if pipe thread connections are utilized.

2. When drainable coils are desired, tubes should be installed in a horizontal position. Use a spirit level. If the tubes cannot be installed level, special drain headers are available on request.

3. Connect the water supply to the bottom connection on the air leaving side and the water return to the top connection on the air entering side.

4. When four connections are provided the extra bottom connection can be used for an auxiliary manual drain connection, and the extra top connection can be used for an automatic air vent or the extra connections can be capped. Connecting the supply and/or return in any other manner will result in very poor performance.

5. Water coils are not normally recommended for use with entering air temperatures below 40°F. Glycol solutions or brines are the only freeze-safe media for operation of water coils for low entering air conditions.

6. When fresh and return air are to be heated or cooled by a water coil, care should be used in the design of the ductwork to insure thorough mixing before the air enters the coil. The return air should always enter the bottom of the duct. Fresh air should enter the top of the duct. The greater the distance between the points of mixing and entrance to the coil, the better the application.

7. Two position control valves, modulating valves, three way valves or a combination of these controls can accomplish control of water coils. Follow the recommendations of the control manufacturer regarding types, sizing and locations. Face and bypass dampers may also be used, but do not close off tightly. Air leakage in cooling applications has no appreciable effect. In heating applications, however, the air temperature may rise several degrees and should be considered in system design. Low leakage dampers may be required.

8. Pipe sizes for the system must be selected on the basis of the head [pressure] available from the circulating pump. It is recommended that the velocity should not generally exceed 8 feet per second and that the friction loss should be approximately 3 feet per 100 feet of pipe.

9. When cooling coils are banked two or three high, an intermediate drain pan with plastic drain tubes extending into the main drain pan should be installed on the air leaving side of each coil. On high latent installations, the condensate draining from top coils may load the lower coils with condensate, resulting in reduced air flow and performance or condensate being blown downstream into the ductwork. All individually installed water cooling coils and the bottom of all cooling coil banks should be mounted in drain pans extending at least ten inches from the leaving air edge of the coil. A drain line trap must be installed to allow condensate to drain freely. The drain line trap depth must be twice the negative static pressure of the operating system for the unit to drain correctly. Incorrect trapping can cause the drain pan to overflow.

Note: Vent and Drain connections are provided on Precision Coils water coils unless otherwise specified. This allows the coils to be drained. Keep in mind that when draining the coils, all water may not drain from the coil. In order to completely drain the coil to prevent the possibility of freezing during cold ambient temperatures, air or nitrogen pressure must be utilized to blow any remaining water from the coil.

Steam Coil Installation Recommendations

A. General

1. Provide separate supports and hangers for the coil and for the piping. Always use a back up wrench on coil connections when attaching piping to the coil. Coils not designed with pitched casing or fin pack must be pitched Ό" per foot towards the return connection at installation.

2. Be certain that adequate piping flexibility is provided. Stresses resulting from expansion of closely coupled piping and coil arrangement can cause serious damage.

3. Do not reduce pipe size at the coil return connection. Carry the return connection size through the dirt pocket, making the reduction at the branch leading to the trap.

4. Vacuum breakers and air vents must be installed on all applications to prevent retaining condensate or air in the coil. Generally the vacuum breaker is to be connected between the coil inlet and the trap. For a system with a flooded return main, the vacuum breaker should be open to the atmosphere and the trap design should allow venting of large quantities of air.

5. Do not drip steam mains through coils.

6. Insure steam pressure and condensate line pressure differential is sufficient to allow efficient condensate removal from the steam coil, especially when using modulating steam control valves to control the leaving air temperature of the coil.

7. Do not attempt to lift condensate without the assistance of a condensate pump. The pressure required to lift condensate must also be considered for sufficient pressure differential. Check valves are also required to prevent reverse flow of condensate back into the coil.

8. Entering air temperatures should not be below 40° F to insure freezing doesn't occur.

B. Traps

1. Size traps in accordance with the manufacturer’s recommendations. Be certain that the required pressure differential will always be available. Do not undersize.

2. Float and thermostatic traps are recommended for high or low-pressure steam systems, but bucket traps may be used. Float and thermostatic traps should be used when air venting is necessary. Bucket traps are recommended for use with on-off control only. It is recommended that traps be located at least 12 inches below the coil return connection. When traps without air venting capabilities are used, air vents are required in the system.

3. Multiple coil installations-
a. Each coil or group of coils that is individually controlled must be individually trapped.
b. Coils in series; separate traps are required for each coil, or bank of coils, in series.
c. Coils in parallel; a single trap may be used but an individual trap for each coil is preferred.

C. Control

1. With coils arranged for series airflow, a separate control is required on each bank, or coil, in the direction of airflow.

2. On high-pressure installations, a two-position steam valve with a face and by-pass arrangement is preferred where modulating control is required.

3. Modulating valves must be sized properly—DO NOT OVERSIZE.

Refrigerant Coil Installation Recommendations

Refrigeration coils manufactured by Precision Coils are shipped with a small nitrogen holding charge. Care should be taken when opening these coils for installation. DX coil distributors have caps installed with soft silver solder. Once the cap is removed and if the TEV is to be installed using anything other than soft solder, the distributor connection should be sufficiently cleaned with emery cloth to remove the soft solder. Follow accepted refrigeration piping practices and safety precautions per Ashrae Standards. If bends or 90's are necessary, long radius fittings must be used to keep the pressure drop through the piping at a minimum. General recommendations for component selection and line sizing follow. Nitrogen charged and capped piping is recommended.

A. Liquid Line Sizing
All compressors have a Refrigerant Charge Limit [RCL] that must not be exceeded. Since the RCL and pressure drop are in direct conflict with each other, Precision Coils recommends that the liquid line be sized as small as possible, while maintaining a low enough pressure drop to ensure 5°F of sub-cooling at the expansion valve.

B. Liquid Line Components
Precision Coils recommends the use of a properly sized liquid line filter-drier, installed upstream from the expansion valve and as close to the evaporator coil as possible. Filter-drier selection should be based on a maximum pressure drop of 2 psi at the design condition.

A moisture indicator / sight glass should be installed between the expansion valve and filter-drier. The moisture indicator / sight glass must be sized to match the size of the liquid line at the thermal expansion valve.

A liquid line shut-off valve with an access port should be sized with the selected liquid line OD, and installed close to the condenser.

The use of other valves, tube bends and reducers should be minimized, since these items tend to increase pressure drop and to reduce sub-cooling at the expansion valve. Liquid line receivers, other than those factory-installed, are not recommended.

The Thermal Expansion Valve [TEV] must be selected for proper size, capacity and refrigerant being used. A slightly oversized valve will allow the unit to operate satisfactorily at low-load conditions. An undersized valve should not be used at any time as this will starve the evaporator of refrigerant causing insufficient air temperatures. The use of a hot gas bypass valve should also be considered when sizing the TEV. Select expansion valves with external equalizer connections, and those designed to operate against a backpressure of 20 pounds per square inch higher than actual evaporator pressure.

The TEV must be installed directly on the evaporator coil liquid line connection provided. The liquid distributor must be in a vertical position. Insure that the distributor nozzle is installed in the distributor if required and that the correct nozzle for the refrigerant being used is installed. Sensing bulbs must be mounted on a clean horizontal suction line close to the evaporator outlet and insulated properly. The bulb must be tight against the suction line at a 10 or 2 o'clock position, but take care not to over tighten and cause damage to the sensing bulb. The bulb should not be mounted directly on top or bottom of the suction line.

CAUTION: Disassemble the thermal expansion valve before completing the brazing connections. If necessary, wrap the valve in a cool wet cloth while brazing. Failure to protect the valve from high temperatures may result in damage to the internal components.

C. Suction Line Sizing
Suction line tubes must be sized to maintain refrigerant vapor velocities that are high enough to ensure good oil return to the compressor under all operating conditions. It is necessary to pitch horizontal suction lines toward the compressor to insure sufficient oil return to the compressor. Traps should be provided at the bottom of suction line risers and at 15 foot intervals for sufficient oil return.

D. Suction Line Components
A suction line pressure tap should be installed on the leaving side of the evaporator coil near the TEV sensing bulb location. Accurate superheat measurement and TEV adjustment demands that suction pressure and temperature be measured near the evaporator coil outlet.

Suction line filter-driers are usually only necessary on systems that have experienced a severe compressor motor burn out or other failure that results in extremely high refrigerant temperature. This filter-drier should not be left in the suction line permanently.

Suction lines should be insulated completely with sufficient wall thickness insulation for the application temperature range being utilized.

Installation Checklist

Use the following checklist to verify that all necessary installation procedures have been completed.

1. Coils are installed with airflow in same direction as indicated on the coil nameplate or casing.

2. Suction connection is at the bottom of the suction header on the evaporator coil, suction line is pitched towards compressor and traps are installed in suction risers. Suction line is insulated with correct wall thickness insulation for the temperature application utilized.

3. If stacking coils, stacking channels are properly installed and bypass air is prevented.

4. Condensate drain pans and piping is installed with a trap in the condensate line and piping insulated and heated if installed in applications that are below freezing.

5. Clean filters are installed upstream of the condenser coil when applicable.

6. A liquid line filter-drier is installed upstream of the expansion valve.

7. A moisture indicator/sight glass is installed between the expansion valve and filter-drier.

8. A liquid line shutoff valve with access port is installed close to the condenser.

9. A schrader valve is installed in the suction line close to the evaporator coil outlet.

10. The TEV, with external equalizer connections, is installed directly on the evaporator liquid connection, sensing bulb mounted in the horizontal position on the suction line and insulated. The liquid distributor must be in a vertical position.

11. Piping system is leak-tested with dry nitrogen, evacuated to 500 microns, and charged with correct refrigerant type and amount.

12. Superheat and sub cooling measurements are taken. Thermal expansion valve is adjusted to obtain desired superheat. Desired superheat on most applications is 8° to 12° at the outlet of the evaporator.

Maintenance

Coil Cleaning

Coils should be kept clean to maintain maximum performance. For operation at it's highest efficiency, the coil should be cleaned often during periods of high cooling demand or when dirty conditions prevail. Power should be disconnected and locked out and motors should be covered to insure that no moisture penetrates into the windings causing motor failure if applicable.

Remove large debris from the coils and straighten fins before cleaning.

Clean refrigerant coils with cold water and detergent or with one of the commercially available chemical coil cleaners. Rinse coils thoroughly after cleaning.

CAUTION: Do not clean the coil with hot water or steam. The use of hot water or steam as a refrigerant coil-cleaning agent will cause high pressure inside the coil tubing and subsequent damage to the coil.

CAUTION: Do not use acidic chemical coil cleaners. Do not use alkaline chemical coil cleaners that, after mixing, have a ph value greater than 8.5 without also using an aluminum corrosion inhibitor in the cleaning solution. Failure to follow these guidelines or the manufacturer’s instructions for use of cleaning chemicals could result in damage to the unit.

WARNING: SOME CHEMICAL COIL-CLEANING COMPOUNDS ARE CAUSTIC, AS WELL AS TOXIC. USE THESE SUBSTANCES ONLY IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS. FAILURE TO DO SO COULD RESULT IN SERIOUS INJURY, DEATH OR EQUIPMENT DAMAGE.

Fin Straightening

Coil fins may have been bent during shipping or servicing, and should be straightened to maintain maximum heat transfer. Reduction of the effective coil surface will correspondingly reduce coil capacity. Always check fin appearance after any handling of the coil and after any servicing is done near the coils.

Fin combs are sized according to number of fins per inch of the coil. For relatively small bends that require only minor repair, other tools may be used to evenly space the fins. Be careful not to damage the coils.

Steam Coil Applications

A steam trap maintenance program should be implemented to insure that steam traps are operating correctly and at maximum efficiency. Failure to do so could result in premature failure of the coil and loss of warranty due to condensate backing up into the coil causing leaks or allowing the coil to freeze during low ambient conditions if supply air drops below 40° F.

Note: Steam distributing coils may also be called "NON-FREEZE" coils. These coils will freeze if temperatures drop below the freezing point. Care should be taken to insure that these coils are not operated at or below freezing temperatures. If there is the possibility that the coils will experience freezing temperatures, freeze safeties should be installed in the system to prevent damage to the coils. Any coil that has failed due to freezing temperatures will not be covered under the standard warranty.

Freight Damage Policy

IMPORTANT – PLEASE READ IMMEDIATELY!

Freight terms for Precision Coils are F.O.B. factory. This means the seller is not responsible for damages or losses to equipment in transit. Although not legally bound, should damages or problems occur, Precision Coils will offer assistance to purchasers provided the purchaser adheres to the following criteria.

Freight Delivery Information

When truck drivers arrive, do not let them rush you. Do not sign anything until you inspect your crate/box/carton very carefully for damage upon receipt.

Look for any indentations in box, protruding nails in crates, fork lift damage to piece. Even if outside package is acceptable, look very carefully inside to check the product. Sometimes it is difficult to see damage without taking the product(s) out of the packaging. If there is any question in your mind that there is possible damage you can’t see, or concealed damage, mark "DAMAGED" on the freight bill. Do not make the mistake of assuming the package is ok. You are only protecting your own interests.

If you have any questions on the above, please give Precision Coils a call. Our Customer Service Department will be more than happy to answer all your questions.

IF THE FREIGHT IS DAMAGED – PLEASE DO THE FOLLOWING!

1. Do not refuse shipment!
Refusal of a damaged shipment simply puts everything in limbo. Freight goes back to the terminal and sits there.

2. Accept shipment and sign freight bill – make sure you note the damage on the freight bill.
NOTE: Accepting a damaged shipment does not hold you liable in any way unless "DAMAGE" fails to appear on the freight bill.*
If shipment is not noted as damaged on the freight bill, Precision Coils will not be responsible for the repair cost as we cannot file a damaged claim with the carrier. As far as the trucking company is concerned, the freight was received free and clear of all damage and they will not be held accountable for the repair charges.* It is the responsibility of the receiver to sign the bill as damaged and make certain that someone will be held responsible to get your product fixed at no charge to you.

3. Do not move the damaged piece from the area in which it was received. Do not discard any packaging, even if it is coming apart.
A damaged shipment must have an inspector look at it before anything can be done with it. If the piece is moved, the inspector can blame the damage on you, claiming possible damage when moved. If the packaging is not available, the inspector can claim faulty packaging.

4. Telephone Precision Coils Immediately
Precision Coils can start by getting in touch with the carrier to have an inspector come over to look at shipment. We can also get a preliminary damage report from you, the customer, in order to have accurate, reliable information before an inspector gives his report. We can also answer any questions or concerns you might have.

5. After inspection has been completed, telephone Precision Coils
As soon as inspection has been completed, we can begin steps to get your product repaired or replaced.

* Concealed Damage: Damage not noted on freight bill. The standard allowance from freight motor carriers on this type of claim is 25% of the total claim amount.