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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
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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