Smoke Detectors; System; Controller; Smoke Detector Sensor - Carrier WeatherMaster 50HCQ04-12 Service And Maintenance Instructions

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.
DEFROST
BOARD
E-HEAT ORN
P3-3 BRN
ORN
1
TB4
ORN
Field
Connections
For simplicity, not all control
wiring internal to the electric
heaters is shown.
Fig. 43 — Accessory Electric Heater Control
Connections (HP-1 Size 08-12, HP-2 Size 08-09)
(CRHEATER128B00, 129B00 only)
DEFROST
BOARD
E-HEAT
ORN
P3-3 BRN
ORN
1
TB4
VIO
Field
Connections
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
Fig. 44 — Accessory Electric Heater Control
Connections (HP-1 Except Size 12 and 121, HP-2
Except Size 12)
BRN
3
BRN
VIO
Elec Htr
VIO HR3
ORN HR1 BRN
LS: Primary Limit Switch
BRN
3
VIO BRN BRN
Elec Htr
VIO HR2 BRN
VIO HR1 BRN
TRAN1 FROM POWER SCHEMATIC
CB
24V 24V BRN
GRN/
3.2 AMPS
YEL
RED
EHR
RED 8 6
NOTE 4
AND 6
FPT
BLK
BLK
BRN
Fig. 45 — TB4 Wiring (HP Only)
W2 Use
R Use
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
26
TRAN2 FROM POWER SCHEMATIC
CB
24V
24V
GRN/
3.2 AMPS
YEL
RED
ORN 1 EHR
1 OFR
VIO
ORN
ORN
RED
TB4
ELECTRIC
BRN
HEAT(ACCESSORY)
SEE HEATER LABEL DIAGRAM
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.
C Use
BRN 5
BRN
0 BRN 3
0 BRN
24V
BRN
BRN 24V
BRN