Bare Heater Model Number
Heater Sales Package PNO
Includes:
Bare Heater
Carton and packing materials
Installation sheet
Table 2 - Heater Model Number
Single Point Boxes and Supplementary Fuses i
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. 30. 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.
All fuses on 50TC 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 i
Unit heater applications not requiring supplemental fuses
require a special Single Point Box without any fuses. 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.
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 30 - Typical Single Point Installation
C14253
Low-Voltage Control Connections i
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. 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. 31.
CTB
I
CONTL 11
BOARD I
<Z2> "
IT- VlO
,,
I
_> --4---OaN----
I
I
@.,@1 BRN
L ........ .I
ORN VlO BRN
','.... 4 ........... ;,
Field
Connections o--I ..... h ....
i .::>.,-vlo ,
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
C08331
Fig. 31 - Accessory Electric Heater Control
Connections
18
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