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Refrigerant-containing components shall comply with ASHRAE 15 and be
factory tested, cleaned, dehydrated, charged, and sealed. Refrigerant
charging valves and connections, and pumpdown valves shall be provided for
each circuit. Filter-drier shall be provided in each liquid line and be
reversible-flow type. Refrigerant flow control devices shall be an
adjustable superheat thermostatic expansion valve with external equalizer
matched to coil, capillary or thermostatic control, and a pilot solenoid
controlled, leak-tight, four-way refrigerant flow reversing valve. A
refrigerant suction line [thermostatic] [thermostatic and water flow
switch] control shall be provided to prevent freeze-up in event of loss of
water flow during heating cycle.
2.8.5
Unit Controls
A unit's basic functions and space ambient conditions shall be controllable
at one station. A temperature and humidity strip-chart recorder, integral
or external to the unit, readable to specified control accuracy, shall be
provided, complete with cartridge ink and chart supply for 1 year of
operation.
2.8.5.1
Externally Accessible Controls
The following controls shall be externally accessible:
a.
Start and stop total system functions.
b.
Audible alarm silence.
c.
Main power disconnect.
2.8.5.2
Status Indicators
The following status indicators shall be externally visible:
a.
Power On.
b.
System On.
c.
Malfunction.
d.
Provision for remote alarm status indication.
2.8.5.3
Alarmed Conditions
The following system status conditions shall be both audibly and visually
alarmed:
a.
Loss of air flow.
b.
Dirty filters.
c.
Compressor overload or lock-out (compressor high head pressure and
low suction pressure).
d.
[High] [High and low] room temperature.
e.
High humidity alarm at [_____] percent relative humidity.
SECTION 15700A
Page 30
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