1.10.2 EXISTING SURGERY UNIT
When air conditioning buildings, the existing surgery air-handling
unit, ducts, and refrigeration unit shall be replaced or upgraded, as
required, to meet current VA HVAC Criteria. See Article 3.21 for
Surgery Suites Systems.
1.10.3 HVAC SYSTEM UPGRADE
Unless directed, or approved otherwise by VA, the existing steam
radiators or convectors heating systems shall be dismantled and
hydronic hot water heating system shall be provided when air
conditioning systems with mechanical cooling are added to an existing
building.
1.10.3.1 If the existing radiators or convectors are to remain in
place, the scope of work, at a minimum, shall include installation of
new modulating control valves in the steam supply lines and
installation of new float and thermostatic steam straps in the steam
condensate return lines. In addition to that, the room temperature
control sequence shall be arranged in such a manner that a single room
thermostat shall control cooling and heating, in sequence, to avoid any
possibility of mechanical cooling and steam heating to be in operation
together. The installation of the new steam control valves and new
steam traps involve considerable expense for retrofitting and existing
steam terminal heating devices. This expense should be carefully
weighed before deciding against hydronic hot water heating systems.
zone control arrangement, the same should be disconnected in place so
that the zone controls do not create any operating conflict with the
room temperature controls proposed above.
the end of wings, size piping, ducts and equipment for future enclosure
and air conditioning of the porches.
HVAC DESIGN MANUAL
1-30
GENERAL REQUIREMENTS
Previous Page
