Trane R Series, Installation Operation & Maintenance

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RLC-SVX07A-EN 43
Installation - Mechanical
CAUTION
Equipment Damage!
To prevent capacity reduction and relief valve damage, do not
exceed vent piping code specifications.
Relief valve discharge setpoints are 450 psig. Once the relief valve has
opened, it will reclose when pressure is reduced to a safe level.
Pipe each relief valve on the unit into a common vent line. Provide access
valve located at the low point of the vent piping, to enable draining of any
condensate that may accumulate in the piping.
WARNING
Contains Refrigerant!
System contains oil and refrigerant under high pressure. Recover
refrigerant to relieve pressure before opening the system. See
unit nameplate for refrigerant type. Do not use non-approved
refrigerants, refrigerant substitutes, or refrigerant additives.
Failure to follow proper procedures or the use of non-approved
refrigerants, refrigerant substitutes, or refrigerant additives could
result in death or serious injury or equipment damage.
If multiple chillers are installed, each unit must have a separate venting for its
relief valves. Consult local regulations for any special relief line requirements.
Evaporator Pressure Relief Valve Venting (for RTWA and RTUA
units only)
All RTWA and RTUA units utilize a low-side refrigerant-pressure relief valve for
each circuit which must be vented to the outdoor atmosphere. The valves are
located on the refrigerant head of the evaporator, one per circuit. Relief valve
connections are 3/8” flare. Refer to Figure
21 and Table 5 . Refer to local
codes for relief valve vent line sizing requirements.
NOTE: Vent line length must not exceed code recommendations. If the line
length will exceed code recommendations for the outlet size of the valve,
install a vent line of the next larger pipe size.
Table 5 Relief Valve Descriptions
Relief Setpoint 450 psig 300 psig
Units RTWA/RTUA RTWA/RTUA
Quantity 1 per ckt 1 per ckt
Relief Rate
Superior
Henry
N/A
35.8lba/min 10.21 Iba/min
N/A