COMFORT-AIRE A-DVC09SF-0, Service Manual

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Service Manual - DVC 09/12/18/24 SF Series
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Procedure:
1). Connect the charge hose to the 3-way service
port, open the 2-way valve and the 3-way valve.
Connect the charge hose to the valve at the
bottom of the cylinder. If the refrigerant is
R410A, make the cylinder bottom up to ensure
liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder
and press the check valve on the charge set to
purge the air (be careful of the liquid
refrigerant).
3) Put the charging cylinder onto the electronic
scale and record the weight.
4) Operate the air conditioner at the cooling
mode.
5) Open the valves (Low side) on the charge set
and charge the system with liquid refrigerant.
6).When the electronic scale displays the proper
weight (refer to the gauge and the pressure of the
low side), disconnect the charge hose from the
3-way valve’s service port immediately and
turn
off the air conditioner before
disconnecting the hose.
7). Mount the valve stem caps and the service
port cap.
Use torque wrench to tighten the service port
cap to a torque of 18N.m.
Be sure to check for gas leakage.
5.6 Re-installation after indoor unit
repair s
1. Collecting the refrigerant into the outdoor
unit
Procedure
1). Confirm that both the 2-way and 3-way valves
are set to the opened position
Remove the valve stem caps and confirm that the
valve stems are in the opened position.
Be sure to use a hexagonal wrench to operate the
valve stems.
2). Connect the charge
hose of low pressure
handle to the 3-way valve gas service port.
3). Air purging of the charge hose.
Open the low pressure handle of the manifold
valve slightly to purge air from the charge hose
for 5 seconds and then close it quickly.
4). Set the 2-way valve to the close position.
5). Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 500
microns.
6). Set the 3-way valve to the closed position
immediately.
Do this quickly so that the gauge ends up
indicating 700 to 800
microns .
Disconnect the charge set, and tighten the 2-way
and 3-way valve’s stem nuts.
Use a torque wrench to tighten the 3-way valves
service port cap to a torque of 18N.m.
Be sure to check for gas leakage.
5.7 Re-installation after outdoor unit
repairs
1. Evacuation for the whole system