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7.TXV Replacement Information
Please follow the steps below when replacing TXV:
(1). Disassemble the front panel.
(2). Remove the thermal bulb down by undoing the copper strips around it.
(3). Seal the pressure pipe from the gas pipe with a welding gun. Be careful not to burn the gas pipe.
(4). Remove the TXV off from the liquid pipe with a welding gun. Be careful not to burn the liquid pipe.
(5). Wrap the new TXV with a piece of wet cloth to prevent damage caused by heat from being too hot and
connect the nitrogen flow to the liquid pipe to prevent it from being oxidized. Weld the TXV to the liquid
pipe, and pay attention to the direction of the TXV, then weld the pressure pipe to the gas pipe.
(6). When the pipe cools down, connect it with 150PSI nitrogen equipment and examine the work for any leaks.
(7). Secure the thermal bulb to the gas pipe with copper strips and perform insulation works.
(8). Vacuum the unit, start up the system and the unit will start cooling operation.
(9). Allow the unit to operate for 20 minutes, then adjust the TXV superheat to 6℉.
(10). After the unit has operated for another 20 minutes, examine whether the superheat is appropriate and
record the reading.
Electric
Air
Heat Kit
Handler
Model
Model
21-4245-01
24K
21-4245-02
21-4245-03
21-4245-01
21-4245-02
36K
21-4245-03
21-4245-04
21-4245-01
21-4245-02
21-4245-03
48K/60K
21-4245-04
21-4245-05
NOTE:
Heat kit is an optionalpart, and it must have a separate power supply.
It is recommended that the electric heater kit should be installed in cold climate regions or when long piping is used.
Properly size the axillary heater per the table above.
Ampacities for MCA and Fuse/breaker include the blower motor.
Heat pump systems require a specified airflow. Each ton of cooling requires between 350 and 450 cubic feet of air per
minute(CFM).
Electric
MIN. Circuit Ampacity
Heat
(kW)
230VAC
208VAC
5
28.3
25.9
7.5
40.7
37.2
10
53.2
48.5
5
29.8
27.4
7.5
42.2
38.7
10
54.7
49.9
15
42.2+36.9 38.6+33.8
5
31.8
29.4
7.5
44.8
40.7
10
56.7
51.9
15
44.8+36.9 40.7+33.8
20
56.7+49.9 51.9+45.2
Installation and Maintenance
Installation and Maintenance
MAX. Fuse or Breaker
(HACR) Ampacity
230VAC
208VAC
30
30
45
40
60
50
30
30
45
40
60
50
45+40
40+35
35
30
45
45
60
55
50+40
50+35
60+50
60+50
10
Fan Speed Tap
2
3
4
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