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3.
Repair ground wire connections as needed and correct line
phasing.
4.
Press the RESET button to clear the tripped condition.
Fuse On Powered Type
The factory fuse is a Bussmann
able screw-in (Edison base) type plug fuse.
Using Unit-Mounted Convenience Outlets
Units with unit-mounted convenience outlet circuits will often
require that two disconnects be opened to de-energize all pow-
er to the unit. Treat all units as electrically energized until the
convenience outlet power is also checked and de-energization
is confirmed. Observe National Electrical Code Article 210,
Branch Circuits, for use of convenience outlets. Always use a
volt meter to verify no voltage is present at the GFIC recepta-
cles before working on unit.
Installing a Weatherproof Cover
A weatherproof while-in-use cover for the factory-installed
convenience outlets is now required by UL standards. This
cover cannot be factory-mounted due to its depth. The cover
must be installed at unit installation. For shipment, the conve-
nience outlet is covered with a blank cover plate.
The weatherproof cover kit is shipped in the unit's control box.
The kit includes the hinged cover, a backing plate and gasket.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lock(s)
and lockout tag(s). Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit rating
plate. Unit may have more than one power switch.
1.
Remove the blank cover plate at the convenience outlet.
Discard the blank cover.
2.
Loosen the two screws at the GFCI duplex outlet, until
approximately
1
/
-in. (13 mm) under screw heads is
2
exposed.
3.
Press the gasket over the screw heads. Slip the backing
plate over the screw heads at the keyhole slots and align
with the gasket; tighten the two screws until snug. Do not
over-tighten.
4.
Mount the weatherproof cover to the backing plate as
shown in Fig. 29.
5.
Remove two slot fillers in the bottom of the cover allow-
ing service tool cords to exit the cover.
6.
Check cover installation for full closing and latching.
1. Bussman and Fusetron are trademarks of Cooper Technologies
Company.
1
"Fusetron" T-15, non-renew-
COVER - WHILE-IN-USE
WEATHERPROOF
Fig. 29 — Weatherproof Cover Installation
SMOKE DETECTORS
Smoke detectors are available as factory-installed options on
48HC models. Smoke detectors can be specified for supply air
only, for return air with or without economizer, or in combina-
tion 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 mount-
ed. The unit is factory-configured for immediate smoke detec-
tor shutdown operation. Additional wiring or modifications to
unit terminal board can 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
(HT28TZ001) and one or two sensors (HT50TZ001). Its pri-
mary function is to shut down the rooftop unit in order to pre-
vent smoke from circulating throughout the building. It is not
to be used as a life saving device.
Controller
The controller includes a controller housing, a printed circuit
board, and a clear plastic cover. See Fig. 30. 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: Power, Trouble and Alarm. A manual
test/reset button is located on the cover face.
25
GFCI RECEPTACLE
NOT INCLUDED
GASKET
BASEPLATE FOR
GFCI RECEPTACLE
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Troubleshooting
