Carrier WeatherMaster Series - Single Point Boxes and Supplementary Fuses; Single Point Boxes Without Fuses; Low- - Voltage Control Connections

22
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
C08134
Fig. 30 -- Typical Component Location
TRACK
FLANGE
C08135
Fig. 31 -- 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 t he 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. 32. 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 installa tion 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 f uses. The
accessory 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.
A
L
LIE
D
P
A
M
O
DE
L
NO
.
ER
I
A
L
N
O.
C
O
R
P
.
O
D
2
2
.
2
3
1
2
3
ISTED
AI
R
NDITIONIN
G
UI
P
ACCES
S
346
N
.
P
/
N
2
-
5
6
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
C14253
Fig. 32 -- Typical Single Point Installation
Low--Voltage Control Connections —
Pull the low--voltage control leads from the heater
module(s) — VIO and BRN (two of each if two modules
are insta lled; 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. 33.
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
2
3
12
132
TB4
HR2
HR1
Elec Htr
CONTL
BOARD
CTB
Field
Connections
for Field-Installed
Electric Heat
VIO BRN BRNVIO
VIO BRN
VIO BRN
ORN
BRN
VIO
ORN VIO BRN
C12106
Fig. 33 -- Optional or Accessory Electric Heater Control
Connections (Except CRHEATER128B00--129B00)