Installation Mechanical
RTHD-SVX02H-EN 59
Refrigerant Pressure Relief Valve Venting
D
WARNING
Hazardous Gases!
Consult local regulations for any special relief line
requirements. Refrigerant vented into a conned equip-
ment room could displace available oxygen to breathe,
causing possible asphyxiation or other serious health
risks. Failure to follow these recommendations could
result in death or serious injury.
Note: 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 sug-
gestions stated in this manual.
All relief valve venting is the responsibility of the install-
ing contractor.
All RTHD units use evaporator, compressor, and con-
denser pressure relief valves (Figure 28) that must be
vented to the outside of the building.
Relief valve connection sizes and locations are shown in
the unit submittals. Refer to local codes for relief valve
vent line sizing information.
D
CAUTION
Equipment Damage!
Do not exceed vent piping code specications. Failure
to comply with specications may result in capacity
reduction, unit damage and/or relief valve damage.
Relief valve discharge setpoints and capacities rates are
given in Table 14. Once the relief valve has opened, it will
reclose when pressure is reduced to a safe level.
Note: Once opened, relief valves may have tendency to
leak and must be replaced.
Figure 28. Relief Valve Location
Evaporator Shell
Pressure relief valve discharge capacities will vary with
shell diameter and length and also compressor displace-
ment. Discharge venting capacity should be calculated
as required by ASHRAE Standard 15-94. Do not adjust
relief valve setting in the field.
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