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22
Electric Heaters
The 50HC 14 units may be equipped with factory-installed
or field-installed electric heaters. The heaters are modular in
design, with heater frames holding open coil resistance wires
strung through ceramic insulators, line-break limit switches
and a control contactor. 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 ac-
cess panel. Heater modules slide into the compartment on
tracks along the bottom of the heater opening. See Fig. 40.
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
accessory, which will be installed directly under the unit con-
trol 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. 41. The
single point box also includes pigtails to complete the wiring
between the single point box and the unit’s main control box
terminals. The pigtails will already be connected into the
unit’s main control box on units with factory installed electric
heat. Refer to the accessory heater and Single Point Box in-
stallation instructions for details on tap connections for field
installed electric heat accessory.
Fig. 41 — Typical Single Point Installation
HEATER AND SUPPLEMENTARY FUSES
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.
All fuses on 50HC 14 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.)
HEATER LOW-VOLTAGE CONTROL CONNECTIONS
One or two heaters can be installed in the unit. Use the
wiring procedure listed below for each heater as determined
by the number of stages in the heater.
Single Stage Heaters
Single-stage heaters will have an orange and a brown con-
trol wire. Connect these to the orange and brown wires locat-
ed on TB4. See Fig. 42.
Fig. 42 — Single Stage Heaters: TB4 Wiring
Connections
Two Stage Heaters
Two-stage heaters will have orange, violet, red and brown
wires. The orange and the purple are the control wires and the
red and brown wires feed the safety circuit. Connect both the
orange and the purple wires to the orange wire locations of
TB4. Connect the red and brown wires to red and brown
wires on TB4. If more than one heater is installed, repeat the
wiring procedure for the second heater. The 3 locations across
the top of TB4 do allow a switch to be installed in series with
some of the heaters in order to add additional heater control.
See Fig. 43.
NOTE: The low voltage wiring will already be completed on
units with factory installed electric heat.
Fig. 43 — Two Stage Heaters: TB4 Wiring
Connections
Humidi-MiZer
®
System Control Connections
HUMIDI-MIZER — SPACE RH CONTROLLER
NOTE: The Humidi-MiZer system is a factory-installed option.
The Humidi-MiZer dehumidification system requires a
field-supplied and installed space relative humidity control
device. This device may be a separate humidistat control
(contact closes on rise in space RH above control setpoint) or
a combination thermostat-humidistat control device such as
Carrier’s Edge
®
Pro Thermidistat with isolated contact set for
dehumidification control. The humidistat is normally used in
applications where a temperature control is already provided
(units with PremierLink™ control).
WARNING
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.
ALLIED PA
MODEL NO.
ERIAL NO.
CORP.
OD
22.2
3
1
23
ISTED AIR
NDITIONING
UIP ACCESS
346N
.
P / N
2-
5610-4
REV
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
NOTE:
Optional Outdoor Temperature Control
at One Heater Stage –
Move heater wire to this terminal and
connect outdoor temperature switch
between 2nd and 3rd terminals.
W2 Use
W1 Use
VIO
12
CONTROL
BOARD
8
CONTROL
BOARD
R Use
C Use
VIO
Summary of Contents for WeatherMaster 50HC14
Page 4: ...4 Fig 2 Unit Dimensional Drawing 14 Size Unit ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing 14 Size Unit cont HORIZONTAL ECONOMIZER VERTICAL ECONOMIZER ...
Page 8: ...8 Fig 4 Roof Curb Details ...
Page 24: ...24 Fig 46 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 39: ...39 Fig 54 50HC14 Control Box Component Locations with ComfortLink Controls ...
Page 40: ...40 Fig 55 50HC14 ComfortLink Control Wiring Diagram ...
Page 41: ...41 Fig 56 50HC14 ComfortLink Power Wiring Diagram ...
Page 42: ...42 Fig 57 50HC14 ComfortLink with Humidi MiZer Power Wiring Diagram ...
Page 44: ...44 Fig 60 PremierLink Wiring Schematic ...
Page 45: ...45 Fig 61 PremierLink Wiring Schematic with Humidi MiZer System Option ...
Page 53: ...53 Fig 80 RTU Open System Control Wiring Diagram ...
Page 54: ...54 Fig 81 RTU Open System Control Wiring Diagram with Humidi MiZer System Option ...
Page 64: ......
Page 65: ......