Specifications

24 YORK INTERNATIONAL
FIG. 11 – TYPICAL REFRIGERANT VENT PIPING FROM RUPTURE DISK
LD03300
Checking Piping Circuits and Venting Air
After the water piping is completed, but before any
water box insulation is applied, tighten and torque the
nuts on the liquid head flanges (to maintain between
30 and 60 ft. lbs. / 41 and 81 nm). Gasket shrinkage
and handling during transit cause nuts to loosen. If
water pressure is applied before this is done, the gas-
kets may be damaged and have to be replaced. Fill the
chilled and condenser water circuits, operate the
pumps manually and carefully check the cooler and
condenser water heads and piping for leaks. Repair
leaks as necessary.
Before initial operation of the unit both water circuits
should be thoroughly vented of all air at the high points.
REFRIGERANT RELIEF PIPING
Each unit is equipped with relief device(s) on the cooler,
condenser and oil separator for the purpose of quickly
relieving excess pressure of the refrigerant charge to
the atmosphere in case of an emergency. The relief
1. Piping should be properly supported
to prevent any strain on bursting disk
mounting.
2. Be careful not to puncture bursting
disk when thread protector is removed.
valve is furnished in accordance with American Soci-
ety of Heating, Refrigeration and Air Conditioning En-
gineers Standard 15 (ASHRAE 15) and set to relieve at
300 PSIG (2069 kPa). The rupture disk on the oil sepa-
rator is set at 345 PSIG (2379 kPa) and sized to accom-
modate the compressor pumping capacity. The relief
valve is furnished in accordance with ASHRAE-15 and
is set to relieve at 300 PSIG (2060 kPa).
Refrigerant relief vent piping (by others), from the re-
lief valves to the outside of the building, is required by
code and should be installed on all units. Refer to Fig-
ures 10, 11 and Table 4. For additional information on
relief valve discharge line sizing, refer to Form 160.47-
AD2 (Application Data).