Nor-Lake Refrigeration Systems - Manual (Page 13)

09/14 Rev. E 101628 13
5. Locate the tubing entrance holes. Center
punch the locations. Using the proper size
hole saw, cut tubing holes straight in, not at an
angle. Two-inch diameter holes, one for the
suction line and one for the liquid line are
sufficient for coupling clearance. Caution:
Tubing entrance holes must be positioned to
clear any panel section joint, panel metal
seam, and should not fall within a six-inch
radius from the center of any panel lock
access hole. See drawing.
6. Remove the dust caps and plugs from the
couplings and inspect them to make sure the
synthetic seals are intact.
7. Using a clean cloth, wipe the coupling seals
and threaded surfaces to prevent any dirt or
foreign material from getting into the system.
8. Lubricate the synthetic seal in the male half of
the couplings with refrigeration oil and thread
the two coupling halves together BY HAND to insure proper mating of the threads. Note: Make
certain that the insulated suction line is connected to the coupling half marked “Suction Line”
and that the bare tube liquid line is connected to the coupling half mar
ked “Liquid Line”.
9.
Using the proper size wrench on the union nut, tighten until the coupling bodies “bottom”, or until
a definite resistance is felt. Tighten an additional 1/6 to 1/4 turn. This final turn is necessary to
insure that the knife-edge metal seal bites into the brass seat of the coupling halves, forming a
leak-proof joint. Note: Always use two wrenches on the coupling body hex nut and on the union
to prevent twisting of the tube while you are tightening.
10. All valves are shipped open and ready for operation. Remember that the refrigeration couplings
on this system are self-sealing and, if the need ever arises, the couplings may be disconnected
without any loss of refrigerant.
11. It is the installing contractor’s responsibility to ensure that the quick-connect refrigerant
couplings are properly mated, tight, and leak free.
Note: All wall penetrations must be sealed. During installation the ends of the suction line insulation
must be taped off and sealed. After the pre-charged lines are installed, the suction line insulation
must be pulled over the quick connects, taped off, and sealed to prevent condensation build up.
CONDENSATE DRAIN LINE
All condensate water from an evaporator must be disposed of properly and not allowed to
accumulate in the unit cooler drain pan or elsewhere causing a safety hazard. Condensate water
must never be drained onto the cooler or freezer floor, or onto adjacent room floors or walkways.
Drain properly to prevent personal injury.
a. All condensate drain plumbing must be installed in accordance with local codes. Caution: The
drain line hole must be positioned to clear any panel section joint, panel metal seam, and should
not fall within a six-inch radius from the center of any panel lock access hole. See drawing
above.
b. Drain lines must be copper tubing for freezer rooms. For cooler rooms, if code permits, the lines
may be PVC.
c. Drain lines must not be smaller than the unit cooler drain connection.
d. The length of drain lines within the refrigerated space must be kept as short as possible before
exiting the room.
e. For proper drainage, drain lines must be pitched downward a minimum of four inches per foot in
freezer rooms, and a minimum of one inch per foot in cooler rooms.