Heater And Supplementary Fuses; Heater Low-Voltage Control Connections; Humidi-Mizer System - Space Rh Controller - Carrier WeatherExpert Puron 50LC 08 Series Installation Instructions Manual

CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
FOAM
BUSHING
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 48 — 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 dis-
tribution and fuse blocks.
All fuses on 50LC 08-12 units are 60-A. (Note that all heaters are
qualified for use with a 60-A fuse, regardless of actual heater am-
pacity, 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 pro-
cedure below for each heater.
The two-stage electric heaters have orange, violet, red and brown
wires. The orange and the violet are the control wires and the red
and brown wires feed the safety circuit. Connect the orange and
the violet wires to the orange and violet 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. 49.
NOTE: The low voltage wiring will already be completed on units
with factory-installed electric heat.
Fig. 49 — Optional or Accessory Electric Heater
Control Connections
Humidi-MiZer ® System Control Connections
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. See
Fig. 51.
HUMIDI-MIZER SYSTEM – SPACE RH CONTROLLER
The Humidi-MiZer dehumidification system requires a field-sup-
plied and installed space relative humidity control device. This de-
vice may be a separate humidistat control (contact closes on rise in
space RH above control setpoint) or a combination thermostat-hu-
midistat control device with isolated contact set for dehumidifica-
tion control. The humidistat is normally used in applications
where a temperature control is already provided (units with RTU
Open control), or a ZS series sensor with humidity sensing.
SystemVu™ controls require 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) (See Fig. 50)
1. Route the humidistat 2-conductor cable (field-supplied)
through the bushing in the unit's louvered end panel (see
Fig. 46).
2. Route the cable through the snap-in wire tie and up to the
web bushing near the control box.
3. Feed the cable through the bushing and into the bottom
left side of the control box after removing one of the two
knockouts in the corner of the box. Use a connector to pro-
tect the cable as it enters the control box.
4. Use the connector and the wire tie to reduce any slack in
the humidistat cable to ensure that it will not be damaged
by contact with the condenser coil (see Fig. 46).
5. Use wire nuts to connect humidistat cable to the leads in
the low-voltage wiring (as shown in Fig. 51), connecting
PNK to PNK and PNK/BLK to PNK/BLK.
NOTE: 50LC**08/09/12 units require a 3-stage cooling ther-
mostat device and are not compatible with Carrier's Edge
thermidistat.
Fig. 50 — Accessory Field-Installed Humidistat
RTU Open Controller (Factory-Installed Option)
For details on operating 50LC**08/09/12 units equipped with the
INTEGRATED
STAGING
factory-installed RTU Open option, refer to the 48/50LC 07-26
CONTROL
Factory Installed Option RTU Open Multi-Protocol Controller
(ICS)
BOARD
Controls, Start-up, Operation and Troubleshooting manual.
SystemVu™ Controller (Factory-Installed Option)
For details on operating 50LC**08/09/12 units equipped with the
factory-installed SystemVu control option, refer to the 48/50LC
04-26 Single Package Rooftop Units with SystemVu Controls Ver-
sion 2.X Controls, Start-up, Operation and Troubleshooting
manual.
30
% RELATIVE HUMIDITY
Pro
®