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The 50HCQ units use a various number of control wires, col-
ors, and terminal boards depending on voltage and unit size.
See Fig. 43-46 and the unit wiring diagram for proper place-
ment.
Fig. 43 — Accessory Electric Heater Control
Connections (HP-1 Size 08-12, HP-2 Size 08-09)
(CRHEATER128B00, 129B00 only)
Fig. 44 — Accessory Electric Heater Control
Connections (HP-1 Except Size 12 and 121, HP-2
Except Size 12)
Fig. 45 — TB4 Wiring (HP Only)
Fig. 46 — TB4 Terminal Use (HP Only)
SMOKE DETECTORS
Smoke detectors are available as factory-installed options on
50HCQ models. Smoke detectors may be specified for Supply
Air only or for Return Air without or with economizer or in
combination of Supply Air and Return Air. Return Air smoke
detectors are arranged for vertical return configurations only. All
components necessary for operation are factory-provided and
mounted. The unit is factory-configured for immediate smoke
detector shutdown operation; additional wiring or modifications
to unit terminal board may be necessary to complete the unit and
smoke detector configuration to meet project requirements.
System
The smoke detector system consists of a four-wire controller
and one or two sensors. Its primary function is to shut down the
rooftop unit in order to prevent smoke from circulating
throughout the building. It is not to be used as a life saving de-
vice.
Controller
The controller (see Fig. 47) includes a controller housing, a
printed circuit board, and a clear plastic cover. The controller
can be connected to one or two compatible duct smoke sensors.
The clear plastic cover is secured to the housing with a single
captive screw for easy access to the wiring terminals. The con-
troller has three LEDs (for Power, Trouble and Alarm) and a
manual test/reset button (on the cover face).
Smoke Detector Sensor
The Smoke Detector Sensor (see Fig. 48) includes a plastic
housing, a printed circuit board, a clear plastic cover, a sam-
pling tube inlet and an exhaust tube. The sampling tube (when
used) and exhaust tube are attached during installation. The
sampling tube varies in length depending on the size of the
rooftop unit. The clear plastic cover permits visual inspections
without having to disassemble the sensor. The cover attaches to
DEFRO
S
T
BOARD
ORN
BRN
Field
Connection
s
E-HEAT
P
3
-
3
3
1
ORN
BRN
ORN
BRN
VIO
TB4
VIO
HR
3
HR1
ORN
BRN
Elec Htr
L
S
: Prim
a
ry Limit
S
witch
For
s
implicity, not
a
ll control
wiring intern
a
l to the electric
he
a
ter
s
i
s
s
hown.
DEFRO
S
T
BOARD
ORN
BRN
Field
Connection
s
E-HEAT
P
3
-
3
3
1
ORN
BRN
VIO
BRN BRN
VIO
TB4
VIO
HR2
HR1
BRN
VIO
BRN
Elec Htr
HR1: On He
a
ter 1 in Po
s
ition #1
HR2: On He
a
ter 2 in Po
s
ition #2 (if in
s
t
a
lled)
NOTE 4
AND 6
RED
EHR
EHR
ORN
TRAN2 FROM POWER SCHEMATIC
24V
BRN
24V
CB
3.2 AMPS
BRN
GRN/
YEL
24V
RED
BRN
1
0
1
0
8
6
FPT
BLK
BLK
BRN
BRN
BRN
RED
ELECTRIC
HEAT(ACCESSORY)
SEE HEATER LABEL DIAGRAM
BRN
BRN
24V
5
TRAN1 FROM POWER SCHEMATIC
24V
BRN
24V
GRN/
YEL
CB
3.2 AMPS
BRN
OFR
VIO
TB4
3
ORN
ORN
RED
NOTE:
Optional Outdoor Temperature Control
at One Heater Stage –
Move heater wire to this terminal and
connect outdoor temperature switch
between second and third terminals.
W2 Use
R Use
C Use
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...