Installation - Mechanical — Remote Evaporator Option
62 RTAC-SVX01J-EN
displacement. Discharge venting capacity should be
calculated as required by ASHRAE Standard 15-94. Do not
adjust relief valve setting in the field.
Leak Test and Evacuation
After installation of refrigerant piping, thoroughly test the
system for leaks. Pressure test system at pressures
required by local codes.
For field evacuation, use a rotary-type vacuum pump
capable of pulling a vacuum of 500 microns or less. Follow
the pump manufacturer's instructions for proper use of
the pump.The line used to connect the pump to the
system should be copper and be the largest diameter that
can be practically used. A larger line size with minimum
flow resistance can significantly reduce evacuation time.
Use the ports on the suction service valves and the liquid
line
shutoff valves for access to the system for evacuation.
Ensure that the suction service valve, the liquid line shutoff
valve, the oil line shutoff valve and any field installed
valves are open in the proper position before evacuating.
Insulate entire suction line and suction accumulator line.
Where
line is exposed, wrap with weatherproof tape and
seal with weatherproof compound.
Table 33. Pressure Relief Valve Data
Valve
Location
Discharge
Setpoint
(psi) Qty
Rated
Capacity
per Valve
(lba/min.)
Field
Connection
Pipe Size (
NPT)
Factory
Shell
Side
Connec-
tion (in)
Evap 200 2 17.3 5/8 7/8 - 14
WARNING
Hazard of Explosion!
Use only dry nitrogen with a pressure regulator for
pressurizing unit. Do not use acetylene, oxygen or
compressed air or mixtures containing them for
pressure testing. Do not use mixtures of a hydrogen
containing refrigerant and air above atmospheric
pressure for pressure testing as they may become
flammable and could result in an explosion.
Refrigerant, when used as a trace gas should only be
mixed with dry nitrogen for pressurizing units. Failure
to follow these recommendations could result in death
or serious injury or equipment or property-only
damage.
Figure 26. Remote evaporator
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