STERLING VS Steam or Hot Water Unit Heaters Vertical Airflow

Sterling VS Steam And Hot Water Vertical Delivery Propeller Unit Heaters

Sterling offers steam and hot water unit heaters in a wide range of ratings from 16,200 Btu/hr to 705,000 Btu/hr. Two different air delivery configurations are available: horizontal and vertical. This listing is for the model VS steam and hot water vertical unit heaters. All vertical heaters can be used with steam OR hot water. 

Competitive Cross Reference:
For your reference, these Sterling unit heaters are similar to the following makes and model #'s:
Airtherm VR, Armstrong Hunt A09C, Beacon Morris VB, Dunham Bush C, Fedders 16, Grainger 3E, Grinnell VL/VP, McQuay FUDH, Modine V, New York Blower C/D/E, Reznor HV/WS, Sterling VS, Trane P/UHPA, Transcon TRT VL/VP/HP, Vulcan VV.

Vertical Unit Heaters Features and General Specifications
Sterling vertical projection unit heaters provide heat where it is required in commercial and industrial applications. Mounted near the ceiling, this unit provides air circulation and reduces stratification, without occupying otherwise usable building space. Units can be provided with an optional diffuser for patterned discharge, or, without a diffuser for higher velocity ‘spot’ heating near doorways and other highloss areas.

Sterling vertical units are available in fifteen sizes for steam or hot water heating. Steam capacities range from 140 to 2,580 E.D.R. (26.0 to 705 MBH) (2 PSI w/60° E.A.T.). Hot water capacities range from 18.9 to 519.4 MBH (200° E.W.T./20° drop w/60° E.A.T.).

CONSTRUCTION
The unit casing is formed by two square steel plates. The bottom plate forms an orifice for air delivery. Air ports are stamped in the top plate of standard units for easy conversion of low output units.

FAN
Sterling aluminum blade fans are quiet, factory balanced and sturdy for standard or sparkproof applications.

HEATING ELEMENT
Hot water-steam coils are rectangular 3 or 4-sided, one-pass, multiple circuit, with aluminum fins mechanically bonded to the tubes. Standard coils are seamless copper tubing. Coils tested at 375 psi under water. Supply and return connections are steel pipe. Standard coils have .025 copper tubing suitable for use on steam pressure to 75 psi or hot water up to 225 psi or 325°F.

MOTORS
Standard motors are 115/60/1, totally enclosed, with thermal overload protection for all units through size VS-280. Standard motors for sizes 40, 62 and 77 are shaded pole, sleeve bearing. The VS-104 motor is permanent split capacitor type with sleeve bearings. Motor for unit sizes 125 through 285 are permanent split capacitor types with permanently lubricated ball bearings. Motors used on unit sizes 317 through 700 are 230/460/60/3, totally enclosed, with permanently lubricated ball bearings. Unit sizes smaller than 317 are also available with 230/460/60/3 motors. All motors fractional H.P. and integral H.P., have Class “B” insulation. The 115/60/1 motors used as standard on unit sizes 40 through 104 can be operated at multiple speeds with the addition of a solid-state control. All units are available with 1140 rpm explosion-proof motors.

THERMOSTATS
Line voltage wall thermostats are in stock for immediate shipment. The thermostat is SPST with a bimetal thermometer, knob-type set point adjustment, 40 to 90°F (5 to 30°C) range and selector switches. Other models available on request. Plastic tamperproof one size fits all thermostat guards are also available.

STRAP-ON WATER CONTROL
A SPDT strap-on type hot water control with 100° to 240°F (38 to 116°C) rated at 10 amps at 120V is also available. Control can be used for direct or reverse acting applications as a high or low limit.

STEAM PRESSURE CONTROL
SPST switch opens on a rise in pressure. Control is automatically reset, has a range of 0 to 15 PSIG (0 to 103 KPa) and has an adjustable differential. Other actions, ranges, circuits and manual reset models are available on request.

MANUAL STARTERS
Single and three-phase models are available. Standard models are single-speed, toggle-operated, NEMA Type 1 and are surface-mounted.

WALL MOUNTED SPEED CONTROLLERS
Units up to HS120 and VS104 with standard motors (115V) can be operated at reduced speeds by addition of optional speed controller. Controller is 5 amps, pre-set at factory for maximum and minimum speeds, with intermediate speeds infinitely controllable. All 1/3, 1/2 H.P. and 230V motors operate only at rated speed and CFM – See performance charts.

	For detailed product literature, please review:
	STERLING VS STEAM AND HOT WATER HEATER - PDF Bulletin

Dimensions and Performance






General Notes:
• As always, shipping in the lower 48 states is included.
• Full 1-year parts warranty on the entire unit.


Leadtimes:
-Standard "VS" units in 115/60/1 power are typically stocked. Plan 3-4 days to process the order + 4-5 days for delivery.
-All special voltages other then 115/60/1 and all special motors other then standard are typically 2-3 weeks to produce + 4-5 days to ship. Please call or e-mail for custom quotes.
These leadtimes are typical, but can change. For precise leadtimes and current stock availablility, please contact us.

Control Sequences:
The following control sequence descriptions are typical for steam/hot water unit heaters.

1) Intermittent Fan Operation - Hot Coil
When a room thermostat calls for heat, the motor is energized. Hot water or steam is continuously supplied to the unit heater, even when the motor is not running. When the thermostat is satisfied, the motor is de-energized (Thermostat available in accessories section).

2) Continuous Fan Operation - Intermittent Hot/Cold Coil
When a room thermostat calls for heat, a valve is opened, allowing steam or hot water to enter the unit heater. When the thermostat is satisfied, the valve is closed. The fan runs continuously (Thermostat available in accessories section).

3) Intermittent Fan Operation - Intermittent Hot/Cold Coil
When a room thermostat calls for heat, the motor is energized. At the same time, a valve is opened allowing steam or hot water to enter the unit heater. An aquastat may be attached to the supply or return piping to prevent fan operation until the coil is adequately heated to avoid cold air delivery. When the thermostat is satisfied, the valve closes and the motor is de-energized (Thermostat and aquastat available in accessories section).

Detailed Installation and Operation Instructions: Every heater will ship with detailed installation instructions. You can also view detailed installation instructions by visiting: Sterling Home Page Ordering Information: These VERTICAL heaters are available in 2 types. These unit heaters will ship from Sterling's manufacturing facility in MA. All standard VS 115/1 phase units will ship out in 3-4 days + delivery. All other voltages and special motors have additional costs and will ship out in 2-3 weeks + delivery. Please contact us for special pricing or more precise leadtimes.

Warranty: You are purchasing this item from H-Mac Systems, Inc. We are a HVAC distributor located in Boston, MA. This product has a 1 year total parts warranty. This is a parts only warranty. If a part fails, Sterling will ship a replacement part to you. The labor to install the part is NOT included. This warranty is between you and the manufacturer. Detailed warranty information will be included in the box. H-Mac Systems will help you facilitate post-sale issues with the manufacturer, but please understand that all post-sale issues are ultimately between you and the manufacturer.

Shipping: As always, shipping in the USA (lower 48 states) is included. Heaters less than 100 lbs ship via UPS Ground. Larger heaters ship via common carrier (FedEx Freight, Roadway Express, etc). Local pick-ups at the factory are not allowed. There will be an additional charge for shipments to Hawaii and Alaska. Please contact us for estimates, or visit www.ups.com.

If you have any questions, please EMAIL or call Toll Free: 877-301-4660.