06-06
2. Liquid Type Transformers: 15 W (50 BTUH) per KVA for 225 KVA and
larger sizes.
3. Electrical Equipment Rooms (Switchgear Rooms): Same as Paragraph D
above.
3.8 EMERGENCY ELECTRICAL POWER
The following components of the HVAC systems for the animal research area
shall be on emergency electrical power:
A. All supply and exhaust air fans serving animal research areas and
general and special exhaust air systems.
B. All automatic
temperature control systems including pneumatic air
compressors, air dryers, and local and central (ECC) engineering
controls.
3.9 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, heating hot water shall be produced from the steam
available from the central boiler plant. The incoming steam pressure
shall be reduced to 204 Pa (30 PSIG) by installing a suitable PRV
station (VA Standard Detail Nos. 15705.31 & 15705-32). Medium
pressure steam ( 206 Pa) (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 total pumping
capacity of the heating system is equal to or less than 3.7 KW (5.0
HP), two convertors and pumps of 100% capacity each shall be
provided.
One convertor and pump shall act as standby.
B. PUMPING CAPACITY (LARGER THAN 3.7 KW (5.0 HP): If the total pumping
capacity of the heating system 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.
C. SYSTEM CONFIGURATION: As far as possible, provide a common heating
system for all heating terminal units and for the unit mounted
preheat coils for which there is no danger of coil freeze up.
With a
common heating system for perimeter heating and interior reheat
applications, care must be taken to ensure that the hot water
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