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24
ELECTRIC HEATERS
The 50HCQ units can be equipped with field-installed accesso-
ry electric heaters. The heaters are modular in design, with
heater frames holding open coil resistance wires strung through
ceramic insulators and control contactor(s), using a combina-
tion of 24v control side break/auto-reset or line-break/auto-re-
set limit switches and a pilot-circuit/manual reset limit switch
to protect the unit against over-temperature situations. One or
two heater modules can be used in a unit.
Fig. 37 — Typical Access Panel Location (3-6 Ton)
Heater modules are installed in the compartment below the in-
door (supply) fan outlet. Access is through the indoor access
panel. Heater modules slide into the compartment on tracks
along the bottom of the heater opening. See Fig. 37-39.
Not all available heater modules can be used in every unit. Use
only those heater modules that are UL listed for use in a specif-
ic size unit. Refer to the label on the unit cabinet re approved
heaters.
Unit heaters are marked with Heater Model Numbers. Howev-
er, heaters are ordered as and shipped in cartons marked with a
corresponding heater Sales Package part number. See Table 10
for correlation between heater Model Number and Sales Pack-
age part number.
NOTE: The value in position 9 of the part number differs between
the sales package part number (value is 1) and a bare heater model
number (value is 0).
Fig. 38 — Typical Component Location
Fig. 39 — Typical Module Installation
Table 10 — Heater Model Number
DI
S
CONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
OUTDOOR
ACCE
SS
PANEL
INDOOR
ACCE
SS
PANEL
DI
S
CONNECT
MOUNTING
LOCATION
EMT OR RIGID CONDUIT
(FIELD-
S
UPPLIED)
S
INGLE
POINT BOX
CENTER
PO
S
T
HEATER
COVER
S
HEATER
MOUNTING
BRACKET
HEATER
MODULE
(LOCATION 2)
HEATER
MODULE
(LOCATION 1)
S
INGLE POINT
BOX
MOUNTING
S
CREW
BRACKET AND
CONDUIT
DRIP BOOT
MAIN
CONTROL
BOX
CONTROL WIRE TERMINAL BLOCK
MANUAL RE
S
ET
LIMIT
S
WITCH
TRACK
FLANGE
BARE HEATER
MODEL NUMBER
C
R
H
E
A
T
E
R
0
0
1
A
0
0
Heater Sales Package
P/N includes:
C
R
H
E
A
T
E
R
1
0
1
A
OR
B
0
0
Bare Heater
Carton and packing
materials
Installation sheet
Summary of Contents for 50HCQ04---12
Page 86: ...86 APPENDIX E WIRING DIAGRAMS cont Fig C 50HCQA04 A05 Control Wiring Diagram 575 3 60...
Page 88: ...88 APPENDIX E WIRING DIAGRAMS cont Fig E 50HCQ 06 Control Wiring Diagram 575 3 60...
Page 93: ...93 APPENDIX E WIRING DIAGRAMS cont Fig J 50HCQ 04 05 06 Power Wiring Diagram 208 230 1 60...
Page 94: ...94 APPENDIX E WIRING DIAGRAMS cont Fig K 50HCQ 04 05 06 Power Wiring Diagram 208 230 3 60...
Page 95: ...95 APPENDIX E WIRING DIAGRAMS cont Fig L 50HCQ 04 05 06 Power Wiring Diagram 460 3 60...
Page 96: ...96 APPENDIX E WIRING DIAGRAMS cont Fig M 50HCQ 04 05 06 Power Wiring Diagram 575 3 60...
Page 100: ...100 APPENDIX E WIRING DIAGRAMS cont Fig Q 50HCQ 12 Power Wiring Diagram 208 230 3 60...
Page 101: ...101 APPENDIX E WIRING DIAGRAMS cont Fig R 50HCQ 12 Power Wiring Diagram 460 3 60 575 3 60...
Page 102: ...102 APPENDIX E WIRING DIAGRAMS cont Fig S 50HCQ PremierLink Control Diagram...
Page 103: ...103 APPENDIX E WIRING DIAGRAMS cont Fig T 50HCQ RTU Open Control Diagram...