Install The Expansion Valve, Liquid Valve, Bypass Valve And Waste Heat Recovery Valve; Preparation For Operation - Panasonic 2WAY MULTI U-16GE3E5 Main Parts Replacement

Expansion Valve, Liquid Valve, Bypass Valve and
Waste Heat Recovery Valve Replacement Procedure

5. Install the expansion valve, liquid valve, bypass valve and waste heat recovery valve.

(1) Attach the replacement expansion valve, liquid valve, and bypass valve to the piping on the side of the unit.
Caution
When replacing the expansion valve, liquid valve, bypass valve and waste heat recovery valve, take care not to
apply shock to the valves.
(2) Weld the piping while cooling the expansion valve, liquid valve, bypass valve and waste heat recovery
valve units with a wet cloth (valve units: 120°C or less).
*When soldering, be sure to replace with nitrogen gas.
(3) Install the solenoid valve coils.
(4) Perform an air tightness test with nitrogen from the low pressure outlet, and make sure there are no
leaks from the welded parts.
Air tightness test pressure 2.3 [MPa]
(5) If the air tightness test is satisfactory, reinstall the pipe securing bracket, thermal insulation, and rubber.
(6) Purge the refrigeration circuit..
Degree of vacuum
Set to valve open and carry out evacuation from the low pressure outlet. After evacuation is finished, cancel the
valve open setting.

6. Preparation for operation

(1) Cancel pump-down.
Set each of the closing valves from the fully closed position to the fully open position. (Figures 2 & 3)
Outdoor unit
3WAY MULTI
Other than above
: Applicable
Set the refrigerant gas and refrigerant liquid closing tubes and the balance tube from the fully closed position to
the fully open position.
The figure below illustrates valves
other than 3-way valves.
Refrigerant
gas tube
Note) For details on 3WAY MULTI valves, refer to "5.
Basic Operation for Shutoff Valves of 3WAY
MULTI" under "Basic Operations" in this manual.
0.133 [kPa/abs]
1.0 [mmHg]
Refrigerant liquid
tube
NA: Not applicable
3WAY MULTI
Closed
Refrigerant
liquid tube
Refrigerant gas Refrigerant intake
tube
NA
Refrigerant liquid tube, refrigerant intake tube, and
refrigerant discharge tube (total of three closing valves)
Refrigerant
gas tube
Figure 2
Shutoff valve
open/close
Status
46
Refrigerant
tube discharge tube
NA NA
Open
Refrigerant
liquid tube
Fully open Fully closed
Figure 3