Low-Voltage Control Connections; Humidi-Mizer System - Space Rh Controller - Carrier WeatherExpert 50LC 07 Series Installation Instructions Manual

BARE HEATER
MODEL NUMBER
Heater Sales Package PNO Includes:
Bare Heater
Carton and packing materials
Installation sheet
SINGLE POINT BOXES AND SUPPLEMENTARY FUSES
When the unit MOCP device value exceeds 60-A, unit-mount-
ed 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. 39. The single point box also in-
cludes 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 or field-
installed electric heat accessory.
All fuses on 50LC 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.)
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 39 — Typical Single Point Installation
SINGLE POINT BOXES WITHOUT FUSES
Some unit heater applications not requiring supplemental fuses
require a special single point box without any fuses. The acces-
sory 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 or field-installed electric heat accessory.

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. 40.
Table 3 — Heater Model Number
C R H E
C R H E
Fig. 40 — Optional or Accessory Electric Heater
Humidi-MiZer
NOTE: It is suggested to ensure the Auto-Changeover function of
an installed thermostat is enabled when used in conjunction with
the Humidi-MiZer Adaptive Dehumidification system.
HUMIDI-MIZER SYSTEM – SPACE RH CONTROLLER
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 clos-
es on rise in space RH above control setpoint) or a combination
thermostat-humidistat control device with isolated contact set
for dehumidification control.
NOTE: Use of a humidistat device is not permitted on 50LC units
equipped with RTU Open control; these units require use of a
field-supplied RH sensor (33ZCSENSRH-02 or 33ZHCSEN-
DRH-02), or a ZS series sensor with humidity sensing. System-
Vu™ controls requires a Space Humidistat (HL38MG029), a Wall
Mount Space Humidity Sensor (33ZCSENSRH-01), or a Duct
Mount Humidity Sensor (33ZCSENDRH-01).
To connect the Carrier humidistat (HL38MG029)
1. Route the humidistat 2-conductor cable (field-supplied)
through the hole provided in the unit corner post.
2. Feed wires through the raceway built into the corner post
(see Fig. 35) to the 24-v barrier located on the left side of
the control box. The raceway provides the UL-required
clearance between high-voltage and low-voltage wiring.
3. Use wire nuts to connect humidistat cable to the leads in
the low–voltage wiring (as shown in Fig. 42), connecting
PNK to PNK and PNK/BLK to PNK/BLK.
NOTE: 50LC**07 units require a 3-stage cooling thermostat de-
vice and are not compatible with Carrier's Edge
24
A T E R 0
A T E R 1
Control Connections
®
System Control Connections
0 1 A 0 0
0 1 A 0 0
INTEGRATED
STAGING
CONTROL
(ICS)
BOARD
® Pro thermidistat.