06-06
3.7 EMERGENCY ELECTRICAL POWER
The following components of the HVAC System shall be on emergency
power:
A. All automatic temperature control systems, including pneumatic air
compressors, air dryers, and local and central engineering controls
(ECC).
B. Ventilation equipment for Emergency Generator Rooms.
C. Ventilation or air-conditioning equipment for elevator machine rooms.
D. Back-up equipment for Telephone Equipment Rooms.
E. Steam condensate return pumps.
F. Computer Room A/C systems.
G. Electric tape for heat tracing of exposed chilled water piping and
condenser water piping requiring freeze protection.
3.8 SMOKE AND FIRE PROTECTION
See Supplement, ATTACHMENT NO.1
4. HEATING SYSTEMS
4.1 GENERAL
As far as possible, hydronic hot water heating system(s) shall be used
to heat the space; and, if the building is on the grounds of the
medical center, the hot water shall be produced from the steam
available from the central boiler plant. The incoming steam pressure
shall be reduced to 207 kPa (30 PSIG) by installing a suitable PRV
station (VA Standard Detail Nos. 15705.31 & 32). Medium pressure steam
207 kPa (30 PSIG) shall be used for the steam preheat coils, steam to
hot water convertors, and humidifiers. If the use of the building
steam from the central boiler plant is not feasible due to elaborate
and cumbersome steam/condensate piping distribution layout, or due to
insufficient boiler capacity, dedicated hot water boilers shall be
used. The electric resistance heating shall not be used unless it is
proven cost effective.
4.2 SELECTION CRITERIA (HOT WATER HEATING)
The following criteria shall apply for sizing and selecting hot water
A. PUMPING CAPACITY 3.7 kW (5.0 HP OR LESS): If the pumping capacity is
equal to or less than 3.7 kW (5.0 HP), two convertors and pumps of
100% capacity each shall be provided. One converter and pump shall
act as standby.
B. PUMPING CAPACITY (LARGER THAN 3.7 kW (5.0 HP): If the pumping
capacity is larger than 3.7 kW (5.0 HP), two convertors and pumps of
50% capacity each shall be provided. No standby equipment is
required.
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