44
RLC-SVX09Q-EN
NOTICE
Equipment Damage!
To prevent shell damage, install pressure relief valves
in both the evaporator and condenser water systems.
NOTICE
Equipment Damage!
Failure to comply with specifications may result in
capacity reduction, unit damage and/or relief valve
damage.
Do NOT exceed vent piping code specifications!
High Pressure Side Relief Valve Venting
(RTWD-Condenser)
All 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. Relief
valve connections are 5/8 inch MFL. Refer to local codes
for relief valve vent line sizing requirements.
High side relief valve discharge setpoint is 300 psig. Once
the relief valve is opened, it will re-close when pressure is
reduced to a safe level.
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.
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.
If multiple chillers are installed, each unit may have
separate venting for its relief valves. If multiple relief valves
are vented together, see ASHRAE 15, and/or local codes
for sizing requirements.
Note: RTWD units can be ordered with Dual Relief Valve
options. Model number digit 16 is a 2. Units with this
option will have two valves on each circuit for a total
of four on the condenser. Only two valves would
release at the same time - never all four.
Low Pressure Side Relief Valve Venting
(Evaporator)
Low-side refrigerant-pressure relief valves are located on
the top of the evaporator shell, one per circuit. Each must
be vented to the outdoor atmosphere. Relief valve
connections are 3/4 inch NPTFI.
Note: Units can be ordered with Dual Relief Valve option.
Model number digit 16 is a 2. Units with this option
will have two valves on each circuit for a total of four
on the evaporator. Only two valves would release at
the same time.
See and Table 16, p. 45. Refer to local codes for relief
valve vent line sizing requirements.
Installation - Mechanical
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