INSTALLING THE CONDENSING UNIT(continued)
Charging
•
The chart below provides the approximate refrigerant charge amount for initial startup based on the line set length. Please see the
chart below for the initial charge amount. The installing technician may still need to add additional charge and dial in the desired
subcooling to achieve optimum performance.
•
Subcooling range is between 5-15°F.
o
When charging during colder ambient temperatures (below 60°F), your target will be the lower end of the subcooling range.
o
When charging during hotter ambient temperatures (above 95°F), the target will be the upper end of the subcooling range.
•
Invert refrigerant tank on a scale. Purge the charging hose up to the manifold and then zero out the scale in preparation for liquid
refrigerant charging.
•
With the power off to the condensing unit, admit liquid refrigerant through the liquid line service valve.
•
Prior to turning on condensing unit, ensure evaporator (air handler) unit is ON and controller is calling for cooling.
•
Turn on the circuit breaker for the condensing unit. The compressor and condenser fan should begin to operate.
•
After startup, wait a minimum of 10 minutes for system to stabilize before checking subcooling or superheat.
•
Place refrigerant tank in upright position in preparation for adding vapor refrigerant (if necessary).
•
Add refrigerant (in vapor form) to the low side of the system through the suction line service port if necessary to achieve
recommended subcooling.
•
Check the superheat at suction service valve on the condensing unit.
•
Adjust the TXV until the superheat is between 10-25°F at the service valve.
•
After recommended superheat and subcooling is achieved, place the service valve stems in the back-seat position (all the way out
counter-clockwise) and reinstall the Schrader valve cores. Once hoses are disconnected, reinstall all caps on service valves
TXV
.
Adjustments
A. System ships with TXV preset for 50ft.
B. A TXV adjustment may be necessary based on ambient temperatures in the cellar and at the condensing unit.
C. Adjust the TXV until the total superheat measured at the suction line service valve is 10-25°F.
i. During colder ambient temperatures (below 75°F), the target will be the lower end of the superheat range.
ii. During hotter ambient temperatures (above 85°F) the target will be the upper end of the superheat range.
TXV
The TXV is preadjusted at the factory. If the superheat is not within
10-25° at the service valve, the TXV will need to be adjusted.
ADJUSTING THE TXV
Use a 5/32˝” hex key to remove the cap from the TXV superheat
adjustment port. With the cap removed, insert the hex key into
the superheat adjustment port. Increase superheat by turning
the hex key clockwise. Decrease superheat by turning the hex
key counterclockwise.
Page 35
Page 35
08/04/21
L
ine Set
Charge Total
10' Line Set
20' Line Set
4.
38
lbs
30' Line Set
4.
54
lbs
4.7
lbs
40' Line Set
4.
22
lbs
50' Line Set
60' Line Set
5.
02
lbs
70' Line Set
5.
18
lbs
5.
34
lbs
80' Line Set
4.86
lbs
90' Line Set
5.
5
lbs
5.66
lbs
100' Line Set
Approximate Initial
Charge Chart
