Redi Controls Redi-Purge PRG-113-C3, Installation, Operation & Maintenance Manual, Page: 13 / 68

13
Refrigerant Line Connections
The purge requires three separate refrigerant line connections (see Figure 1 on page 12):
1. A 1/2" purge inlet line between the purge tank and the condenser purge outlet. The
same condenser outlet the old purge used.
2. A 1/4" liquid return line from the purge tank dra in solenoid valve to the liquid return angle
valve on the evaporator. (
Can be same valve used by old purge unit drain back line
provided it enters Evaporator above liquid refrigerant level - see NOTE on next page ).
3. A 3/8" vent line from the discharge port on the pumpout compressor to the emission
collection canister, or the rupture disc vent line or direct to the outdoor atmosphere.
Auxiliary Condenser and Heat Recovery Units
When the purge is applied to a heat recovery unit or a unit with an auxiliar y condenser, some
additional piping considerations are required:
1. The purge unit vapor inlet line must be connected to both the cooling and auxiliary heat recovery
condensers. The entire length of both lines must slope toward either the purge unit or
condensers.
Avoid sagging of the tubing where pockets of liquid refrigerant can condense
and accumulate .
2.
Shutoff valves (½ inch ball valves) must be provided at both condensers so the non-operating
condenser can be isolated.
Purge Vapor Inlet Line
The purge vapor inlet line runs between the original purge pickup point on the condenser shell
(this point is typically beneath an internal baffle plate inside the condenser), and the purge
inlet connection on the purge tank. This line must be 1/2 -inch refrigeration-grade copper
tubing.
The existing shutoff valve, or solenoid valve
must be removed and discarded, and the 1/2 -inch
line adapted to connect direct to the condenser purge pickup fitting. Chiller manufacturers
have generally utilized three different size purge connections, 1/2-inch NPT, 3/8-inch NPT,
and 1/4-inch NPT. In any case, the 1/2-inch line can be easily adapted to connect to any of
the three connections.