50Tc 16 Unit Size - United Technologies Carrier WeatherMaker 50TC A08 Series Installation Instructions Manual

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 — Unit heater applications
not requiring supplemental fuses require a special Single Point
Box without any fuses. The accessory Single Point Boxes con-
tain a set of power taps and pigtails to complete the wiring be-
tween the Single Point Box and the unit's main control box ter-
minals. Refer to accessory heater and Single Point Box installa-
tion 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. 55 — 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 installed; identify for Module #1) -
to the 4-pole terminal board TB4 located on the heater bulk-
head to the left of Heater #1. Connect the VIO lead from Heat-
er #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 ter-
minal TB4-3. See Fig. 56.
LCTB
CONTL
BOARD
2
VIO
3
ORN
12
BRN
ORN
1
TB4
VIO
Field
Connections
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
Fig. 56 — Accessory Electric Heater Control
Connections
BRN
VIO
2 3
VIO
BRN BRN
Elec Htr
VIO BRN
HR2
VIO
HR1 BRN
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. 57.
CTB
CONTL
BOARD
2
VIO
3
ORN
12 BRN
ORN
TB4
Field
Connections
For simplicity, not all control
wiring internal to the electric
heaters is shown.
Fig. 57 — Accessory Electric Heater Control
Connections for CRHEATER128B00-129B00 Only

50TC 16 UNIT SIZE

50TC-D16 units may be equipped with field-installed acces-
sory 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
indoor (supply) fan outlet. Access is through the indoor access
panel. Heater modules slide into the compartment on tracks
along the bottom of the heater opening. See Fig. 59.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment dam-
age.
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.
Single Point Boxes — When heaters are installed, power wir-
ing to both heaters and the rest of the unit is connected via the
single point box accessory, which will be installed directly
under the unit control box, just to the left of the partition sepa-
rating the indoor section (with electric heaters) from the out-
door section. The single point box has a hinged access cover.
See Fig. 58. 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.
30
VIO BRN
1 2 3
ORN VIO BRN
Elec Htr
VIO
HR3
LS
ORN BRN
HR1
LS: Primary Limit Switch
CAUTION