Carrier PHJ4 - Table 1 - Electric Heater Usage Chart; Table 2 - Minimum Airflow for Heater Operation; 7. Open heater package and remove heater module; secure heater module to standoffs on blower inlet with (3) bolts provided (see Fig. 3). Adjust mounting position so that all hardware and sheetmetal clears the heating element wire by at least 1;4 in....; 8. Reinstall rear motor support bracket and attached motor wiring. Reinsert motor power plug and speed tap plug into motor. The connectors are polarized to prevent mis-wiring.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2
X= Not Approved Combination
X= Not Approved Combination
7. Open heater package and remove heater module; secure heater
module to standoffs on blower inlet with (3) bolts provided (see
Fig. 3). Adjust mounting position so that all hardware and
sheetmetal clears the heating element wire by at least 1/4 in.
Reinstall heater/blower assembly.
8. Reinstall rear motor support bracket and attached motor wiring.
Reinsert motor power plug and speed tap plug into motor. The
connectors are polarized to prevent mis-wiring.
9. Remove heater wiring cover plate from interior partition between
blower and control box (See Fig. 4) and install heater wiring plug
attachment plate provided with heater.
10. Remove unit front panel to access unit control box compartment.
11. Open heater package and remove heater control panel; set heater
control panel on top of unit (See Fig. 5).
12. Heater control panel will have black and yellow power wires
ending in panel mounted plugs; reach through large rectangular
opening in control panel and snap these plugs into mating openings
in heater wiring plug attachment plate installed in step 9 above (See
Fig. 4).
13. Rotate heater control panel into unit control box area and locate it
into top left corner of control box; secure heater control panel to
unit control box with (4) screws provided (See Fig. 6).
14. Open flexible “fish paper” insulation cover provided with unit
control box and route heater low voltage wires along the bottom of
the unit control box. Route low voltage leads from heater relay(s)
through hole in unit control box and into low voltage splice box.
(See Fig. 6 and Fig. 7.) dress wires and secure them to existing unit
control wires with wire ties provided .
15. Re-close flexible “fish paper” insulation cover; insure unit black
and yellow power “pigtails” from contactor are properly routed
through insulation cover (See Fig. 8).
16. Attach the adhesive backed wiring label provided with the heater to
the back of the access panel near the unit wiring label (See Fig. 1).
17. Return to blower compartment and locate black and yellow power
wires from heater module; these wires will terminate in plug
connectors that mate with the plug from the heater control installed
in Step 13 above. Snap these connectors into place; dress and secure
wires to fan wires with wire ties provided (See Fig. 9).
18. The factory speed tap for electric heat operation is tap 2. Refer to
blower performance table in the unit installation instructions or
pre-sale literature to determine available airflow at duct system
external static pressure. Compare the actual airflow with the
minimum required airflow from Table 2. If tap 2 airflow is lower
than minimum required airflow, recheck blower performance table
to see if minimum airflow can be achieved on tap 3. If tap 3 airflow
meets the minimum CFM requirement, change speed tap for
electric heat from tap 2 to tap 3 in unit control box. See unit
instructions and wiring diagram. If tap 3 airflow does not achieve
minimum CFM requirement, then another electric heater that meets
the minimum CFM requirement must be used.
19. Reattach the blower access panel.
Table 1 – Electric Heater Usage Chart
CPHEATER
Agency
Approval
kW V PH
Circuit
Breaker
Air Conditioner Models (PAC) Heat Pump Models (PHP)
24 30 36 42 48 60 24 30 36 42 48 60
125 UL 5 208/240 1 N           
126 UL 5 208/240 1 Y            
127 UL 7.5 208/240 1 N           
128 UL 7.5 208/240 1 Y            
129 UL 10 208/240 1 N     
130 UL 10 208/240 1 Y            
131 UL 15 208/240 1 Y          
132 UL 20 208/240 1 Y      
Table 2 – Minimum Airflow for Heater Operation
Air Conditioner
Unit Size
Minimum Airflow (CFM)
5 kW 7.5 kW 10 kW 15 kW 20 kW
24 600 750 750 X X
30 600 750 750 X X
36 600 750 750 1050 X
42 600 750 750 1050 X
48 600 750 750 1050 1400
60 600 750 750 1050 1400
Heat Pump
Unit Size
Minimum Airflow (CFM)
5 kW 7.5 kW 10 kW 15 kW 20 kW
24 750 800 800 X X
30 750 800 800 X X
36 750 800 800 1200 X
42 750 800 800 1200 X
48 750 800 800 1200 1700
60 750 800 800 1200 1700