Relief Valves; Refrigerant Relief Valve Venting - Trane RTWD Installation Operation & Maintenance

Refrigerant Relief Valve Venting

To prevent injury due to inhalation of R134a or R1234ze
gases, do not discharge refrigerant anywhere. If multiple
chillers are installed, each unit must have separate
venting for its relief valves. Consult local regulations for
any special relief-line requirements.
All relief-valve venting is the responsibility of the
installing contractor.
Note: After being opened once, relief valves tend to leak.
Condenser Pressure Relief Valve Venting
All RTWD units utilize a refrigerant-pressure relief valve
for each circuit which must be vented to the outdoor
atmosphere. The valves are located at the top of the
condenser. 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.
RTUD units are not equipped with refrigerant pressure
relief valve on the high pressure side. The safety valve
calibration installed on refrigerant piping or on the
condenser must not exceed 25 bar.
Figure 7 - Condenser Relief Valves
A = Condenser relief valves
RLC-SVX14H-GB
CAUTION Equipment Damage!
To prevent capacity reduction and relief valve damage,
do not exceed vent piping code specifi cations. RTWD
relief valve discharge setpoints are 21 bar rel. 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.
Note: Units can be ordered with "Dual Relief Valve"
options. Model number digit 16 is a "2". RTWD units this
option will have 4 total relief valves.

Relief Valves

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