mrcool 13seer r410 cond install manual 4web
Unitary Ducted Split AC & HP
12
6. Recovering Refrigerant from Existing System
6.1 Disconnect Power
Disconnect all power to the existing outdoor unit at the disconnect switch or main fuse box/
breaker panel.
6.2 Connect Manifold Gauge Set
Connect a gauge set, clean recovery cylinder and a recovery machine to the service ports of
the existing unit. Use the instructions provided with the recovery machine to make the connections.
Manifold Gauges
Recovery Machine
Clean Recovery Cylinder
Outdoor Unit
High
Low
Disconnect Switch
Main Fuse Box/Breaker Panel
Fig.13
6.3 Recovering Refrigerant
Remove existing HCFC−410A refrigerant using one of the following procedures:
METHOD 1:
Us this method if the existing outdoor unit is not equipped with shut−off valves, or if the unit is
not operational and you plan to use the existing HCFC−410A to ush the system.
Remove all HCFC−410A refrigerant from the existing system. Check gauges after shutdown to
conrm that the entire system is completely void of refrigerant.
METHOD 2:
Use this method if the existing outdoor unit is equipped with manual shut−off valves, and you
plan to use new HCFC−410A refrigerant to ush the system.
The following devices could prevent full system charge recovery into the outdoor unit:
● Outdoor unit’s high or low−pressure switches (if applicable) when tripped can cycle the
compressor OFF.
● Compressor can stop pumping due to tripped internal pressure relief valve.
● Compressor has internal vacuum protection that is designed to unload the scrolls
(compressor stops pumping) when the pressure ratio meets a certain value or when the suction
pressure is as high as 20 psig. (Compressor suction pressures should never be allowed to go into
a vacuum. Prolonged operation at low suction pressures will result in overheating of the scrolls and
permanent damage to the scroll tips, drive bearings and internal seals.)
Once the compressor can not pump down to a lower pressure due to one of the above system
conditions, shut off the vapor valve. Turn OFF the main power to unit and use a recovery machine
to recover any refrigerant left in the indoor coil and line set.
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