15
3)
Air purging-
Open the valves on the charging cylinder and the
charge set. Purge the air by loosening the flare
nut on the 2-way valve approximately 45’ for 3
seconds then closing it for 1 minute; repeat 3
times.
After purging the air, use a torque wrench to
tighten the flare nut on the 2-way valve.
4)
Check the gas leakage. Check the flare connections
for gas leakage.
5)
Discharge the refrigerant. Close the valve on the
charging cylinder and discharge the refrigerant
by loosening the flare nut on the 2-way valve
approximately 45’ until the gauge indicates 0.3 to
0.5 Mpa.
6)
Disconnect the charge set and the charging cylinder,
and set the 2-way and 3-way valves to the open
position. Be sure to use a hexagonal wrench to
operate the valve stems.
7)
Mount the valve stems nuts and the service
port cap. Be sure to use a torque wrench to
tighten the service port cap to a torque 18N·m.
Be sure to check the gas leakage.
5.5 Adding the refrigerant after running the
system for many years
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. 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 while the indoor unit needs
to be repaired
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.
Summary of Contents for DA1221-H2-I
Page 1: ...DuctlessAire ES Series Service Manual 2016 ABSSA B4 1601 ...
Page 8: ...6 For DA1221 H2 I For DA1821 H2 I DA2421 H2 I ...
Page 10: ...8 For DA1221 H2 O ...
Page 11: ...9 For DA1821 H2 O ...
Page 12: ...10 For DA2421 H2 O ...
