Installing Outdoor Unit; Charging With Refrigerant - Panasonic CS-ME7CKPG Service Manual

CS-ME7CKPG / CS-ME10CKPG / CS-ME12CKPG / CS-ME14CKPG / CS-ME18CKPG / CU-2E15CBPG / CU-2E18CBPG / CU-3E23CBPG / CU-4E27CBPG
3P097711-1
(M02B043)
Outdoor Unit
1

Installing Outdoor Unit

When installing the outdoor unit, refer to "Precautions for Selecting the Location" and the "Indoor/outdoor
Unit Installation Drawings."
If drain work is necessary, follow the procedures below.
2
Drain Work
(CU-3E23CBPG)
Use drain plug for drainage.
If the drain port is covered by a mounting base or floor surface, place
additional foot bases of at least 30 mm in height under the outdoor
unit's feet.
In cold areas, do not use a drain hose with the outdoor unit.
(Otherwise, drain water may freeze, impairing heating performance.)
(CU-4E27CBPG)
1. Insert drain receiver (C) onto drain socket (A) and drain cap (B)
beyond 4 projections around drain socket and drain cap.
2. I nsert drain socket and drain caps into their matching drain hole ;
Drain socket (A) into drain hole I and drain caps (B) into drain hole II
and III. After insertion, turn them about 40 clockwise.
(Be sure not to insert them into wrong drain holes, or
there causes water leakage.)
II
I
(View from bottom)
III
3. Connect vinyl hose on the market (intemal diameter of 25 mm) to drain socket (A)
(If the house is too long and hangs down, fix it carefully to prevent the kinks.)
Note
If the drain holes of the outdoor unit are covered with the mounting bracket or the floor, raise the unit to provide
the space of more than 100mm under the leg of the outdoor unit.
3
Refrigerant Piping
1. Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with
the torque wrenches.
Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and escaping gas.
Flare nut tightening torque
14.2-17.2N·m
Flare nut for 6.4
φ
(144-175kgf·cm)
32.7-39.9N·m
Flare nut for φ 9.5
(333-407kgf·cm)
2. To prevent gas leakage, apply refrigeration machine oil on both inner and outer surfaces of the flare.
(Use refrigeration oil for R-410A)
4
Purging Air and Checking Gas Leakage
When piping work is completed, it is necessary to purge the air and check for gas leakage.
5

Charging with Refrigerant

If the total length of piping for all rooms exceeds the figure listed below, additionally charge with 20 g of
refrigerant (R-410A) for each additional meter of piping.
Outdoor capacity class CU-4E27CBPG
Total length of piping for all rooms
CAUTION
Even though the shut-off valve is fully closed, the refrigerant may slowly leak out; do not leave the flare nut
removed for a long period of time.
6
Refrigerant Piping Work
Cautions on Pipe Handling
Protect the open end of the pipe against dust and moisture.
All pipe bends should be as gentle as possible. Use a pipe
bender for bending.
(Bending radius should be 30 to 40 mm or larger.)
Selection of Copper and Heat Insulation materials
When using commercial copper pipes and fittings, observe the following:
Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052kW/mK (0.035 to 0.045 kcal/mh C)
Refrigerant gas pipe's surface temperature reaches 110 C max.
Choose heat insulation materials that will withstand this temperature.
Be sure to insulate both the gas and liquid piping and to provide insulation
dimensions as below.
Pipe size
O.D : 6.4mm / Thickness : 0.8mm
O.D : 9.5mm, 12.7mm / Thickness : 0.8mm
O.D : 15.9mm / Thickness : 1.0mm
Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Drain-water hole
Bottom frame
Drain plug
Hose (available
commercially, inner
dia. 16mm)
(A) Drain socket (B) Drain cap
(C) Drain receiver
Valve cap tightening Service port cap
torque tightening torque
Liquid pipe
10.8-14.7N·m
26.5-32.3N·m
(110-150kgf·cm)
(270-330kgf·cm)
CU-3E23CBPG
40m 30m
Be sure to place
a cap.
Rain
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
or water out.
°
°
Inter-unit wiring
Gas pipe
Pipe insulation
I.D : 8-10mm / Thickness : 10mm min.
I.D : 12-15mm / Thickness : 13mm min.
I.D : 16-20mm / Thickness : 13mm min.
Gas pipe
insulation
Finishing tape
76
While
pressing
Wall
Liquid pipe
Liquid pipe
insulation
Drain hose