June 99
A.
GENERAL: The type and number of HVAC systems
shall depend upon the configuration and size of the
cemetery buildings. Evaluate a gas and/or oil system
for all facilities. If gas or oil is not available a factory
fabricated self-contained, direct expansion (DX)
cooling unit, with electric resistance heat, or, an
air-to-air heat pump (for locations with minimum 2C
(35F) winter outdoor temperature) unit shall be
evaluated. Depending upon the available space and
building layout, the unit shall be a single piece or a split
system configuration. For relatively larger facilities,
evaluate the use of a hot water heating system (with
natural gas and/or No. 2 oil as the fuel) and a chilled
water cooling system (with air cooled chillers).
B.
SYSTEM FEATURES:
1.
For outdoor installations, the unit shall be fully
weatherized and in modular sections to ensure
ease of servicing maintenance.
2.
Depending upon the unit capacity and availability,
equip the HVAC unit with a return air fan and an
economizer cycle capability to get "free cooling"
during mild weather.
3.
Equip the unit with at least 30% (ASHRAE Test)
efficiency filters with 50 mm (2") thick throw-away
prefilters. If higher efficiency filters are available,
specify the same.
4.
Complete the air distribution arrangement with
supply and return air ductwork, supply and return
air outlets, and duct mounted heating coils or air
terminal units. While the conditioned supply air
shall be distributed to each occupied space by the
network of air supply ducts, the extent of the
return air duct shall depend upon the layout of the
building. Exhaust air shall be ducted from each
area to be exhausted. Transfer of supply, return,
and exhaust air from one occupied area to
another is not permitted without ducted
connections. Exception; Toilets and Janitor
Closets.
5.
Perimeter Heating: Provide perimeter heat for all
locations where winter outdoor temperature is -
17C (0F) and lower. If the building thermal
envelope is not in compliance with the
VA Design Guide -- National Cemetery Administration
Page 5 -59
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