Bryant Legacy 549J 12 Series, Руководство по установке

Страница: 22 / 44

22
Fig. 39 — Typical Component Location
Single Point Boxes
When heaters are installed, power wiring to both heaters and
the rest of the unit is connected via the single point box acces -
sory, which will be installed directly under the unit control box,
just to the left of the partition separating the indoor section
(with electric heaters) from the outdoor section. The single
point box has a hinged access cover. See Fig. 40. The single
point box also includes pigtails to complete the wiring between
the single point box and the unit’s main control box terminals.
Refer to the accessory heater and single point box installation
instructions for details on tap connections.
Fig. 40 — Typical Single Point Installation
Heater and Supplementary Fuses
When the unit MOCP device value exceeds 60-A, unit-mount -
ed supplementary fuses are required for each heater circuit.
These fuses are included in accessory Single Point Boxes, with
power distribution and fuse blocks.
All fuses on 549J units are 60-A. (Note that all heaters are
qualified for use with a 60-A fuse, regardless of actual heater
ampacity, so only 60-A fuses are necessary.)
Heater Low-Voltage Control Connections
One or two heaters can be installed in the unit. Use the wiring
procedure listed below for each heater as determined by the
number of stages in the heater.
Single Stage Heaters
Single-stage heaters will have an orange and a brown control
wire. Connect these to the orange and brown wires located on
TB4.
Two Stage Heaters
Two-stage heaters will have orange, purple, red and brown
wires. The orange and the purple are the control wires and the
red and brown wires feed the safety circuit. Connect both the
orange and the purple wires to the orange wire locations of
TB4. Connect the red and brown wires to red and brown wires
on TB4. If more than one heater is installed, repeat the wiring
procedure for the second heater. The 3 locations across the top
of TB4 do allow a switch to be installed in series with some of
the heaters in order to add additional heater control.
See Fig. 41 for additional details.
CONTROL AND POWER WIRING DIAGRAMS
Figures 42-44 are typical control and power wiring diagrams.
HEATER
MOUNTING
BRACKET HEATER
MODULE
(LOCATION 2) HEATER
MODULE
(LOCATION 1) SINGLE POINT
BOX
MOUNTING
SCREW
SINGLE
POINT BOX HEATER
COVERS MANUAL RESET
LIMIT SWITCH
DISCONNECT
MOUNTING
LOCATION
ALLIED PA
MODEL NO.
ERIAL NO.
CORP.
OD
22.2
3
1
23
ISTED AIR
NDITIONING
UIP ACCESS
346N .
P / N 2-
5610-4 REV
1
1
1 3
2
1
2 3
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
FOAM
BUSHING
DRIP BOOT
BRACKET
MOUNTING
SCREWS
HEATER
RELAYS
POWER
WIRES
HEATER
MOUNTING
SCREWS