Carrier WeatherMaster 50HC14 Installation Instructions Manual page 20

CONNECTOR
PLATE
ASSEMBLY
GASKET
Fig. 35 — Installing Thru-the Base Option
Check tightness of connector lock nuts before connecting
electrical conduits.
Field-supplied and field-installed liquid-tight conduit con-
nectors and conduit may be attached to the connectors on the
basepan. Pull correctly rated high voltage and low voltage
through appropriate conduits. Connect the power conduit to the
internal disconnect (if unit is so equipped) or to the external
disconnect (through unit side panel). Remove one of the two
knockouts located on the bottom left side of the unit control
box. Use this hole for the control conduit.
UNITS WITHOUT THRU-BASE CONNECTIONS
1. Install power wiring conduit through side panel openings.
Install conduit between disconnect and control box.
2. Install power lines to terminal connections as shown in
Fig. 23.
FIELD CONTROL WIRING — The 50HC**14 unit re-
quires an external temperature control device. This device can
be a thermostat (field-supplied) or a PremierLink™ controller
(available as factory-installed option or as field-installed acces-
sory, for use on a Carrier Comfort Network
control) or the RTU Open Controller for Building Management
Systems using non-CCN protocols (RTU Open controller is
available as a factory-installed option only).
THERMOSTAT — Select a Carrier-approved accessory
thermostat. When electric heat is installed in the 50HC unit, the
thermostat must be capable of energizing the G terminal (to en-
ergize the Indoor Fan Contactor) whenever there is a space call
for heat (energizing the W1 terminal). The accessory thermo-
stats listed on the unit price pages can provide this signal but
they are not configured to enable this signal as shipped.
Install the accessory thermostat according to installation in-
structions included with the accessory.
Locate the thermostat accessory on a solid wall in the condi-
tioned space to sense average temperature in accordance with
the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24-v pow-
er, use a thermostat cable or equivalent single leads of different
colors with minimum of seven leads. If the thermostat does not
require a 24-v source (no "C" connection required), use a ther-
mostat cable or equivalent with minimum of six leads. Check
the thermostat installation instructions for additional features
which might require additional conductors in the cable.
For wire runs up to 50 ft (15 m), use no. 18 AWG (Ameri-
can Wire Gage) insulated wire (35°C minimum). For 50 to
75 ft (15 to 23 m), use no. 16 AWG insulated wire (35°C mini-
mum). For over 75 ft (23 m), use no. 14 AWG insulated wire
(35°C minimum). All wire sizes larger than no. 18 AWG
® or as a stand alone
20
cannot be directly connected to the thermostat and will require
a junction box and splice at the thermostat.
Typical
Thermostat
Connections
C
G
W2
(Note 2)
W1
O/B/Y2
(Note 1)
Y1
NOTES:
1. Typical multi-function marking. Follow manufacturer's configu-
R
ration instructions to select Y2. Do not configure for O output.
2. W2 connection not required on units without electric heating.
Field Wiring
Note 1: Typical multi-function marking. Follow manufacturer's configuration
instructions to select Y2. Do not configure for O output.
Note 2: W2 connection not required on units without electric heating.
Field Wiring
Fig. 36 — Typical Low-Voltage Control
Connections
UNIT WITHOUT THRU-BASE CONNECTION KIT —
Pass the thermostat control wires through the bushing on the
unit end panel. Route the wire through the snap-in wire tie and
up to the web bushing near the control box. Route the wire
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. Using a connector at the control box to protect the
wire as it passes into the control box. Pull the wires over to the
terminal strip at the upper left corner of the Central Terminal
Board (CTB). Use the connector at the control box and the
wire tie to take up any slack in the thermostat wire to ensure
that it will not be damaged by contact with the condenser coil.
See Fig. 37.
NOTE: If thru-the-bottom connections accessory is used, refer
to the accessory installation instructions for information on
routing power and control wiring.
Fig. 37 — Thermostat Wire Routing
Central
Terminal
Board
X
C
T
H
G
E
R
W2
M
O
W1
S
T
Y2
A
T
Y1
R