30
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 a unit--mounted non--fused
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. 35.
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 GFCI
receptacle. This should cause the internal GFCI
circuit to trip and open the receptacle.
2. Inspect for proper grounding and power line phasing
should the GFCI receptacle fail to trip.
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 “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 GFIC receptacles 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 its
depth. The cover must be installed at 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, a backing plate
and gasket.
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, LOCK--OUT/TAGOUT all
electrical power to the unit.
!
WARNING
TOP
TO
P
TOP
WET LOCATIO
NS
W
ET
L
OC
AT
IO
NS
COVER - WHILE-IN-USE
WEATHERPROOF
BASEPLATE FOR
GFCI RECEPTACLE
GASKET
GFCI RECEPTACLE
NOT INCLUDED
C09022
Fig. 36 -- Weatherproof Cover Installation
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
/
2
-in (13 mm) under screw heads
is 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. 36.
5. Remove two slot fillers in the bottom of the cover
allowing service tool cords to exit the cover.
6. Check cover installation for full closing and latching.
SMOKE DETECTORS
Smoke detectors are available as factory--installed options
on 48HC models. Smoke detectors can be specified for
Supply Air only and/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 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 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 includes a controller housing, a printed
circuit board, and a clear plastic cover. See Fig. 37. The
controller can be connected to one or two compatible duct
smoke sensors. The clear plastic cover is secured to the
48H
C
Summary of Contents for 48HC D17 Series
Page 77: ...77 APPENDIX IV WIRING DIAGRAMS C12616 Fig 77 48HC D17 D28 Power Diagram 208 230 3 60 48HC...
Page 78: ...78 APPENDIX IV WIRING DIAGRAMS C12617 Fig 78 48HC D17 D28 Power Diagram 460 3 60 48HC...
Page 79: ...79 APPENDIX IV WIRING DIAGRAMS C12618 Fig 79 48HC D17 D28 Power Diagram 575 3 60 48HC...
Page 86: ...86 APPENDIX IV WIRING DIAGRAMS C13767 Fig 86 RTU OPEN Wiring Diagram 48HC...
Page 87: ...87 APPENDIX IV WIRING DIAGRAMS C13768 Fig 87 RTU OPEN Wiring Diagram with Humidi MiZer 48HC...