49
Fig. 78 — Typical Single Point Installation
(Sizes 07-14)
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; iden-
tify 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 heat-
ing, 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. 79.
Fig. 79 — Accessory Electric Heater Control
Connections (Sizes 07-14)
For CRHEATER128B00-129B00 only
Connect the ORN lead from Heater Relay 1 (HR1) to terminal
TB4-1. For 2-stage heating, connect the VIO lead from Heater
Relay 3 (HR3) to terminal TB4-2. For 1-stage heating with
CRHEATER128B00 or CRHEATER129B00, connect the ORN
lead from HR1 and the VIO lead from HR3 to terminal TB4-1.
Connect the BRN lead from HR1 to TB4-3. See Fig. 80.
Fig. 80 — Accessory Electric Heater Control
Connections for CRHEATER128B00-129B00 Only
(Sizes 07-14)
50TC 16 UNIT ELECTRIC HEATERS
50TC-D16 units may be equipped with field-installed accesso-
ry electric heaters. The heaters are modular in design. One or
two heater modules may be used in a unit.
Heater modules are installed in the compartment below the in-
door (supply) fan outlet. Access is through the indoor access
panel (see Fig. 82). Heater modules slide into the compartment
on tracks along the bottom of the heater opening. See Fig. 81.
Single Point Boxes
When heaters are installed, power wiring to both heaters and
the rest of the unit is connected via the single point box acces-
sory, which 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. 83. The single
point box also includes tap conductors 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.
A
L
L
I
E
D
P
A
M
O
D
E
L
NO
.
E
R
I
A
L
N
O.
C
O
R
P
.
O
D
2
2
.
2
3
1
2
3
I
STED
A
I
R
NDITIONIN
G
UI
P
AC
C
ES
S
346
N
.
P
/
N
2
-
5
6
1
0
-
4
R
E
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
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
2
3
12
13
2
TB4
HR2
HR1
Elec Htr
CONTL
BOARD
CTB
Field
Connections
VIO BRN BRNVIO
VIO BRN
VIO BRN
ORN
BRN
VIO
ORN VIO BRN
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Not all available heater modules and single point boxes
may be used in every unit. Use only those heater modules
that are UL listed for use in a specific size unit. Refer to the
label on the unit cabinet for the list of approved heaters and
single point boxes.
CTB
CONTL
BOARD
ORN
BRN
Field
Connections
LS: Primary Limit Switch
2
3
12
31
VIO
ORN VIO BRN
BRNVIO
2
TB4
VIO
HR3
HR1
ORN BRN
Elec Htr
ORN
For simplicity, not all control
wiring internal to the electric
heaters is shown.
LS
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