Carrier 50LC 07, Service And Maintenance Instructions, Page: 25 / 100

25
Table 5 – Heater Model Number
Bare Heater Model
Number
C R H E A T E R 0 0 1 A 0 0
Heater Sales Package
PNO
Includes:
Bare Heater
Carton and packing
materials
Installation sheet
C R H E A T E R 1 0 1 A 0 0
ALLIED PA
MODEL NO.
ERIAL NO.
CORP.
11 13
21 23
OD
22.2
3
1
23
ISTED AIR NDITIONING
UIP ACCESS
346N
.
P / N 2- 5610-4 REV
1 1
13
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
C08136
Fig. 31 -- Typical Single Point Installation
On 50LC units, all fuses are 60--A. Single point boxes
containing fuses for 208/230--V applications use UL Class
RK5 250--V fuses (Bussman FRNR 60 or Shawmut TR
60R). Single point boxes for 460--V and 575--V
applications use UL Class T 600--V fuses (Bussman JJS
60 or Shawmut A6T 60). (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.)
Unit heater applications not requiring supplemental fuses
require a special Single Point Boxes without fuses. The
accessory Single Point Boxes contain a terminal block and
a set of power taps 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.
Safety Devices
Electric heater applications use a combination of
line--break/auto--reset limit switches and a
pilot--circuit/manual reset limit switch to protect the unit
against over--temperature situations.
Line--break/auto--reset limit switches are mounted on the
base plate of each heater module. (See Fig. 32.) These are
accessed through the indoor access panel. Remove the
switch by removing two screws into the base plate and
extracting the existing switch.
Pilot--circuit/manual reset limit switch is located in the
side plate of the indoor (supply) fan housing. (See Fig.
29.)
ALLIED PA
MODEL NO.
ERIAL NO.
11 13
21
23
OD
3
1
23
ISTED AIR
NDITIONING
UIP ACCESS
346N .
P / N 2-
5610-4
REV
Line-Break
Limit Switches
C08330
Fig. 32 -- Typical Location of Heater Limit Switches
(3--phase heater shown)
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 installed; 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. Connect the VIO lead from Heater #2 to
terminal TB4--2. Connect both BRN leads to terminal
TB4--3. (See Fig. 33.)