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 l. HVAC equipment should not be installed in attics, overhead, or above suspended ceilings,
unless abso lutely necessary. When dictated by necessity, provide access and floor space for
maintenance. In addition, provide auxiliary coil drain pans below all cooling equipment and
pipe separately from primary system.
m. Avoid use of cooling towers.
n. Electronic/Direct Digital Control (DDC) systems are the preferred HVAC control systems.
If by necessity pneumatic controls need to be utilized, then associated air compressors shall be
installed within mechanical rooms, inaccessible to occupants for periodic
service/maintenance. For HVAC systems being replaced, verify the existence of Utility
Management and Control (UMAC) (Coggins) interface devices. Where present, re -establish
monitoring and control capabilities in new HVAC system.
o. Equipment control cab inets should be located no higher than 5' above finished floor.
Avoid locating in high humidity spaces such as mechanical rooms with steam equipment and
piping.
p. Avoid use of economizers (dry bulb or enthalpy) as locally high humidity conditions and
poor control reliability prohibits successful use.
q. All HVAC systems 7 tons and over should be interfaced with the station UMAC system.
The current system employs the Coggins energy management system that is capable of load
shedding during peak energy consumption.
r. For HVAC systems utilizing gas (propane or natural) as heating source, ensure
specifications for the HVAC unit require contractor to furnish unit compatible with gas
source.
2. STEAM STANDARDS:
a. Minimize the use of steam manholes. T hose that must be used are to be raised 12" above
finish grade and provided with full grated top.
b. Do not install steam pits within mechanical rooms.
c. Equip steam manholes with steam ejector pumps. Add electric sumps where steam is
turned off duri ng the summer.
d. Use schedule 80 black steel carrier pipes for buried steam condensate lines.
e. Use welded valves in steam pits. Inside buildings, flanged valves are permitted.
f. Use Link Seals on steam and condensate piping where they penetrate manho le walls.
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