Carrier WeatherMaster 50HC*D08 Series - Page 21

21
Table 3 — Heater Model Number
Fig. 32 — Typical Access Panel Location
Fig. 33 — Typical Component Location
Fig. 34 — Typical Module Installation
Single Point Boxes and Supplementary Fuses
When the unit MOCP device value exceeds 60-A, unit-
mounted supplementary fuses are required for each heater
circuit. These fuses are included in accessory single point
boxes, with power distribution and fuse blocks. The single
point box 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. 35. The single
point box also includes a set of power taps and 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 on field-installed electric heat accessory.
All fuses on 50HC 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.)
Single Point Boxes without Fuses
Unit heater applications not requiring supplemental fuses
require a special single point box without any fuses. The ac-
cessory single point boxes contain a set of power taps and
pigtails to complete the wiring between the single point box
and the unit’s main control box terminals. Refer to accessory
heater and single point box installation instructions for details
on tap connections on field-installed electric heat accessory.
Fig. 35 — Typical Single Point Installation
Low-Voltage Control Connections
Pull the low-voltage control leads from the heater mod-
ule(s) — VIO and BRN (two of each if two modules are in-
stalled; identify for Module #1) — to the 4-pole terminal
board TB4 located on the heater bulkhead to the left of Heater
#1. Connect the VIO lead from Heater #1 to terminal TB4-1.
Except for CRHEATER128B00-129B00, for 2 stage heating,
connect the VIO lead from Heater #2 to terminal TB4-2. For
1 stage heating with 2 heater modules connect the VIO lead
from both Heater #1 and #2 to terminal TB4-1. Connect both
BRN leads to terminal TB4-3. See Fig. 36.
Bare Heater Model Number CRHEATER001A/B00
Heater Sales Package PN
Includes:
Bare Heater
Carton and packing materials
Installation sheet
CRHEATER
101A/B00
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
OUTDOOR
ACCESS PANEL
INDOOR
ACCESS
PANEL
DISCONNECT
MOUNTING
LOCATION
EMT OR RIGID CONDUIT
(FIELD-SUPPLIED)
SINGLE
POINT BOX
CENTER
POST
HEATER
COVERS
HEATER
MOUNTING
BRACKET
HEATER
MODULE
(LOCATION 2)
HEATER
MODULE
(LOCATION 1)
SINGLE POINT
BOX
MOUNTING
SCREW
BRACKET AND
CONDUIT
DRIP BOOT
MAIN
CONTROL
BOX
CONTROL WIRE TERMINAL BLOCK
MANUAL RESET
LIMIT SWITCH
TRACK
FLANGE
AL
L
I
E
D
P
A
M
O
DE
L
NO
.
E
R
I
A
L
N
O.
C
O
RP
.
O
D
2
2
.
2
3
1
2
3
ISTED
AIR
NDITIONING
UIP
ACCESS
346
N
.
P
/
N
2-
56
1
0-
4
RE
V
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