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2WAY SYSTEM
Outdoor Unit Repair Procedures
3
8. Pumping Out Refrigerant from Outdoor Unit
8-2. If Remote Controller is Not Available for Maintenance of Outdoor Unit
(1) Connect the manifold gauge valves at the Lo-side to the low-pressure outlet port of the outdoor unit to be
repaired. Also connect the refrigerant recovery cylinder to any one of the normal outdoor units at the liquid
line service port (Schrader-type push-to-release valve). Perform the connection work quickly so that no air is
allowed to enter them. (Fig. 14)
* Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during this
operation by recovering the refrigerant from the outdoor unit to be repaired.
(Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures,
such as installing a high-pressure cutout in the circuit.)
The hoses may be subject to internal pressure from the refrigerant inside the out-
door unit. Check that the manifold gauge valves are fully closed beforehand.
A Schrader-type push-to-release valve is provided at each connection port.
CAUTION
(2) Determine the outdoor unit where the unit No. setting (SW5)(3P DIP switch)(Black) on the outdoor unit control
PCB is set to No.1.
(3) Short-circuit the MODE pin ("HEAT" side of CN40) on the outdoor unit control PCB of the No. 1 unit.
(4) Short-circuit the CHK pin (CN23) to start operation, leave the unit running for a while. Touch the gas tubing with
fingers to determine whether the unit is running in heating.
While closing the valves, the rise in discharge temperature or another factor may
cause a protective device to activate, stopping the operation of the outdoor unit. If this
occurs, immediately fully close the gas tube valve on the outdoor unit to be repaired.
CAUTION
(5) Close the balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube service valve.
* When the low pressure at the outdoor unit to be repaired reaches 0.5 MPa or below, pull out the SCT connec-
tor (2P) (YEL) (CN65) from the outdoor unit control PCB of that outdoor unit. Then immediately fully close the
gas tube valve on that outdoor unit.
* Pulling out the SCT connector immediately stops all of the outdoor units.
(6) Connect the high-pressure gauge side of the manifold gauge to the high-pressure outlet port on the outdoor
unit to be repaired, and connect the manifold gauge to the refrigerant recovery device. Be sure that no air enters
the tubing at this time.
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