38 CGWF-SVX01A-EN
Installation Mechanical
40-60 T for units with HGBP
Pressure Relief Valve Venting
All CGWF units utilize two refrigerant-pressure relief valves for each circuit (one high
side and one low side) which must be vented to the outdoor atmosphere. The high
side relief valves are located at the left end of each condenser at the top (facing the
control panel). The low side relief valves are located at the right end of the
evaporator.Relief valve connection sizes are 5/8” flare on the condenser and 3/8” flare
on the evaporator.
CCAF units have evaporator relief valve(s) only.
All relief valve venting is the responsibility of the installing contractor.
Vent pipe size must conform to the ANSI/ASHRAE Standard 15 for vent pipe sizing. All
federal, state, and local codes take precedence over any suggestions stated in this
manual.
Consult local regulations for any special relief line requirements.
CAUTION
Proper Vent Piping!
Vent piping must be installed to code specifications. Failure to heed
specifications could result in capacity reduction, unit damage and/or
relief valve damage.
Once the relief valve has opened, it will re-close when pressure is reduced to a safe
level. The valve may leak and should be replaced.
Pipe each relief valve on the unit into a common vent line. Provide an access valve on
the common line to connect vacuum pump discharge and vent excess refrigerant out
of the mechanical room. The access valve must be located at the low point of the vent
piping to enable draining of any condensate that may accumulate in the piping.
Table 7 Percent Glycol and Freeze Solution Temperatures
% Glycol
Ethylene Glycol Propylene Glycol
Solution Freeze Point (°F) Solution Freeze Point (°F
032 32
529 29.3
10 25.5 26.4
15 21.5 23.1
20 16.8 19.3
25 11.4 14.8
30 5.1 9.3
35 -2.3 2.7
40 -10.8 -5.2
45 -20.7 -14.6
50 -32.1 -25.8
54 -42.3 -36.1
CWSP
∆T
4
-------4°F+
– LWTCS=
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