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UNIT
CONNECT
VOLTAGE
AS
L1: RED +YEL
208, 230
240
L2: BLU + GRA
L1: RED
460
480
Splice BLU + YEL
L2: GRA
L1: RED
575
600
L2: GRA
Fig. 29 — Powered Convenience Outlet Wiring
Duty Cycle
The unit-powered convenience outlet has a duty cycle limitation.
The transformer is intended to provide power on an intermittent
basis for service tools, lamps, etc; it is not intended to provide 15A
loading for continuous duty loads (such as electric heaters for
overnight use). Observe a 50% limit on circuit loading above 8A
(i.e., limit loads exceeding 8A to 30 minutes of operation every
hour).
Maintenance
Periodically test the GFCI receptacle by pressing the TEST button
on the face of the receptacle. This should cause the internal circuit
of the receptacle to trip and open the receptacle. Check for proper
grounding wires and power line phasing if the GFCI receptacle
does not trip as required. Press the RESET button to clear the
tripped condition.
Fuse on Powered Type
The factory fuse is a Bussmann Fusetron
screw-in (Edison base) type plug fuse.
USING UNIT-MOUNTED CONVENIENCE OUTLETS
Units with unit-mounted convenience outlet circuits will often re-
quire that two disconnects be opened to de-energize all power to
the unit. Treat all units as electrically energized until the conve-
nience outlet power is also checked and de-energization is con-
firmed. Observe National Electrical Code Article 210, Branch Cir-
cuits, for use of convenience outlets.
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PRIMARY
TRANSFORMER
CONNECTIONS
TERMINALS
H1 + H3
H2 + H4
H1
H2 + H3
H4
H1
H2
1
T-15, non-renewable
SMOKE DETECTORS
Smoke detectors are available as factory-installed options on
48JC(G/H) models. Smoke detectors may be specified for sup-
ply air only, for return air without or with economizer, or in com-
bination of supply air and return air. Return air smoke detectors
are arranged for vertical return configurations only. All compo-
nents 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 roof-
top unit in order to prevent smoke from circulating throughout
the building. It is not to be used as a life saving device.
Controller
The controller (see Fig. 30) includes a controller housing, a print-
ed 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 controller has three
LEDs (for Power, Trouble and Alarm) and a manual test/reset but-
ton (on the cover face).
Smoke Detector Sensor
The smoke detector sensor (see Fig. 31) includes a plastic housing,
a printed circuit board, a clear plastic cover, a sampling 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 the sensor housing using four
captive screws and forms an airtight chamber around the sensing
electronics. Each sensor includes a harness with an RJ45 terminal
for connecting to the controller. Each sensor has four LEDs (for
Power, Trouble, Alarm and Dirty) and a manual test/reset button
(on the left-side of the housing).
Duct Smoke Sensor
Controller
Controller
Housing
and Electronics
Conduit Couplings
(Supplied by Installer)
Fastener (x2)
Alarm
Fig. 30 — Controller Assembly
18
Conduit Nuts
(Supplied by Installer)
Conduit Support Plate
Terminal Block Cover
Cover Gasket
(Ordering Option)
Controller
Cover
Trouble
Power
Test/Reset
Switch
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Table of Contents
Troubleshooting
