Steam & Water Heating - Page 11

STEAM "SBS" AND HOT WATER "SBS" SYSTEMS

Engineers Specifications

Furnish and install the following Hastings (steam) (hot water) heating system :

Blower Section :

1. A. Blower wheels shall be statically and dynamically balanced, forwardly curved, double width, double inlet, class 1.
2. Blower wheels shall be mounted on a solid furned ground shaft.
3. Bearings shall be ball bearing, self-aligning, greaseable, pillow block or flange mounted.
4. Blower housings, bearings and adjustable motor base shall be mounted on a reinforced frame to insure rigidity and quiet operation.
5. The driver and driven sheave shall be of the keyed hub type. The driven sheave shall be of a fixed pitch diameter and the driver sheave shall-be of a variable pitch diameter through 10 HP and fixed pitch above 10HP . V-belt drives shall be sized for 135% of motor horsepower.
6. Cabinet shall be constructed of high quality (18) (16) (14) gauge aluminized steel to insure long rust-free life.
7. Access panels shall be provided to allow easy access to motors and filters.
8. Outside surface of cabinet  shall be primed with zinc-chromate and finished with a coat of enamel.

Coil Section :

1. A. Coils shall be fabricated of heavy gauge copper tubes, staggered on 11/2 centers, mechanically bonded to energy efficient plate type aluminum fins. Headers shall be constructed of heavy seamless copper tubing and coil casings of double flanged galvanized steel.
2. All coils shall be tested leak free at 315 PSIG air pressure under water.
3. Steam systems shall be furnished with steam distributing coils having free floating cores and pitched in casing to ensure condensate drainage.

Filter Section:

Filter section shall be an integral component of the heating system with "V" or "Z" frames.

Motor :

A T-frame, ODP, 1800 RPM prelubricated ball bearing type motor shall be furnished for voltage and scheduled.

Electric Controls :

The following controls shall be furnished.

Motor starter.

Control transformer.

freezeestat (s)

NEMA 1 master control panel.

Remote control station with system switches and indicating lights.

Temperature Control :

The following control sequence and control components shall be furnished with the heating system.

A. Space Heating

1. Model HS - Two position space thermostat with two position valve and choice of constant or intermittent fan operation.
2. Model HO - Modulating spce thermostat with modulating valve and constant fan operation.

B. Make  up Air

1. Model MA- Single coil having modulating discharge air temperature control of modulating face and by pass damper, two position valve with mild weather air temperature lockout and inlet air shut-off damper.
2. Model MB - Double coil having inlet air temperature control of pre-heat coil with two position valve, modulating discharge air temperature control of downstream coil with modulating valve and inlet air shutoff damper.

C. Heating & Ventilating

1. Model VA - Single coil having modulating space air temperature and over-riding discharge air temperature control of face and by-pass damper, two position calve with mild weather air temperature lockout and mixed air dampers with manual potentiometer. Inlet air shut-off damper replaces mixing dampers with 100% outside air applications.
2. Model VB - Double coil having inlet air temperature control of preheat coil with two position valve, modulating space air temperature and overriding discharge air temperature control of downstream coil with modulating valve and mixed air dampers with manual potentiometer. Inlet air shutoff damper replaces with 1000% outside air applications.

Assembly :

The system shall be factory assembled and wired with the exception of controls that are remote to the unit.

Options and Accessories :

The following items are to be furnished: (insert desired items from page 4 of this bulletin. )

Control valves are shipped by Hastings for field installation in custoers steam or hot water piping manifold. The heating coils furnished with "SBS' or "SBW" systems are subject  to damage from freezing. The like hood of this occurring can be minimized by following the instructions outlined in the installation manual.

In order to maintain our policy of continuous product improvement, we reserve the right to change prices, specifications, ratings or dimensions without notice or obligation.