Smoke Detectors - Carrier 48TC 17 Series Service And Maintenance Instructions

The primary leads to the convenience outlet transformer
are not factory−connected. Selection of primary power
source is a customer−option. If local codes permit, the
transformer primary leads can be connected at the
line−side terminals on
disconnect or circuit breaker switch; this will provide
service power to the unit when the unit disconnect switch
or circuit breaker is open. Other connection methods will
result in the convenience outlet circuit being de−energized
when the unit disconnect or circuit breaker is open. See
Fig. 33.
GFCI Maintenance
Periodically test the GFCI receptacle by pressing the
TEST button on the face of the receptacle.
1. Press the TEST button on the face of the receptacle.
This should cause the internal circuit of the receptacle
to trip and open the receptacle.
2. Check for proper grounding and power line phasing
should the GFCI receptacle fail to trip.
3. Repair ground wire connections as needed and correct
the line phasing.
4. Press RESET button to clear the tripped condition.
Fuse On Powered Type
The factory fuse is a Bussman "Fusetron" T−15,
non−renewable 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 power 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 GFCI receptacles before
working on the 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 the unit installation.
For shipment, the convenience 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, backing plate and
gasket.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing service or maintenance operations
on the convenience outlets, Lockout/Tagout all
electrical power to the unit.
a unit−mounted non−fused
COVER - WHILE-IN-USE
WEATHERPROOF
BASEPLATE FOR
GFCI RECEPTACLE
Fig. 34 − Weatherproof Cover Installation
1. Remove the blank cover plate at the convenience out-
let. Discard the blank cover.
2. Loosen the two screws at the GFCI duplex outlet until
approximately / −in (13 mm) under the screw heads
1 2
is exposed.
3. Press the gasket over the screw heads. Slip the back-
ing 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. 34.
5. Remove two slot fillers in the bottom of the cover to
allow service tool cords to exit the cover.
6. Check the cover installation to confirm full closing
and latching.

SMOKE DETECTORS

Smoke detectors are available as factory−installed options
on 48TC 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
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 (HT28TZ001) and one or two sensors
(HT50TZ001). 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 device.
Controller
The controller (see Fig. 35) 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
28
GFCI RECEPTACLE
NOT INCLUDED
GASKET
C09022
immediate smoke detector