Step 5 -Make Electrical Connections; Field Power Supply; Field Control Wiring; Heat Anticipator Settings - Carrier 50HE003-006 Installation Instructions Manual

Step 5 —Make Electrical Connections
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death,
Unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may
consist of electrical wire connected to unit ground lug in
control compartment, or conduit approved for electrical
ground when installed in accordance with NEC (National
Electrical Code), ANSI/NFPA (National Fire Protection
Association), latest edition, and local electrical codes. Do
not use gas piping as an electrical ground.

Field Power Supply

All units except 208/230-v units are factory wired for the voltage
shown on the nameplate. If the 208/230-v unit is to be connected
to a 208-v power supply, the transformer must be rewired by
disconnecting the black wire from the 230-v 1/4- -in. terminal on
the transformer and connecting it to the 200-v 1/4- -in. terminal
from the transformer.
Refer to unit label diagram for additional information. Pigtails
are provided for field service. Use factory-supplied splices or UL
(Underwriters' Laboratories) approved copper connector.
When installing units, provide a disconnect per NEC.
All field wiring must comply
requirements.
Install field wiring as follows:
1. Install conduit through side panel openings. For units
without electric heat, install conduit between disconnect
and control box.
2. Install power lines to terminal connections as shown in
Fig. 12.
3. For units with electric heat, refer to Accessory Electric
Heat Installation Instructions.
During operation, voltage to compressor terminals must bewithin
range indicated on unit nameplate (also see Table 3 and 4). On
3- -phase units, voltages between phases must be balanced within
2% and the current within 10%. Use the formula shown in Table
3 and 4, Note 2, to determine the percentage of voltage
imbalance. Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to electrical
components. Such operation invalidates any applicable Carrier
warranty.
NOTE: If accessory thru-the-bottom connections and roof curb
are used, refer to the Thru-the-Bottom Accessory Installation
Instructions for information on wiring the unit.

Field Control Wiring

Install a Carrier-approved accessory thermostat assembly
according to installation instructions included with the accessory.
Locate thermostat assembly on a solid wall in the conditioned
space to sense average temperature in accordance with thermostat
installation instructions.
Route thermostat cable or equivalent single leads of colored wire
from subbase terminals through connector on unit to low-voltage
connections (shown in Fig. 10 and 11).
with NEC and local
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gauge) insulated wire (35_C minimum). For 50 to 75 ft, use
no. 16 AWG insulated wire (35_C minimum). For over 75 ft, use
no. 14 AWG insulated wire (35_C minimum). All wire larger
than no. 18 AWG cannot be directly connected to the thermostat
and will require a junction box and splice at the thermostat.
1. Connect thermostat wires to screw terminals of lowvoltage
terminal board.
2. Pass the control wires through the hole provided in the
control box.
3. Some models may be equipped with a raceway built into
the corner post on the left side of control box (See Fig.
13.) This raceway provides the required clearance between
high- -voltage and low voltage wiring. For models without
a raceway, ensure to provide the NEC required clearance
between high- -voltage and low- -voltage wiring.

Heat Anticipator Settings

Set heat anticipator settings at 0.8 amp for first stage and 0.3 for
second stage heating.
COOL STAGE 1 Y1/W2
FAN G
HEAT STAGE 1 W/W1
COOL STAGE 2 Y/Y2
HEAT STAGE 2 O/W2
24 VAC HOT R
24 VAC COM C
N/A
OUTDOOR AIR S1
SENSOR S2
THERMOSTAT DIPSWITCH SETTINGS
ON
OFF
A B C D
LEGEND
Field Wiring
NOTE: Underlined letter indicates active thermostat output when
configured for A/C operation.
Fig. 10 --- Low- -Voltage connections With or
Without Economizer or Two- -Position Damper
CONTROL
CONNECTION
BOARD
24 VAC
R
RMTOCC
G
CMPSAFE
Y2
FSD
W1
SFS
NOT USED
C C
X X
Fig. 11 --- Low- -Voltage Connections
(Units with PremierLinkt Controls)
8
R
G
Y1
WIRE
Y2 CONNECTIONS
TO
W1 LOW-VOLTAGE
SECTION
W2
C
IPD/X
C06008
THERMOSTAT CONTROL
CONNECTION
BOARD
R R
Y1
Y1
Y2
Y2
W1 W1
W2
W2
G
G
C C
X
C06009