7
Step 4 —Make Electrical connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may
cause damage to electrical components. Such operation
would void any applicable Carrier warranty.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing service or maintenance, be sure indoor
unit main power switch is turned OFF and indoor blower
has stopped.
Control Cir cuit W
iring
Control voltage is 24 v (40 va minimum). See Fig. 5 and unit label
diagram for field--supplied wiring details. Route control wire
through opening in unit side panel to connection in unit control
box.
A07398
Fig. 5 --- 38HDR Typical Control Circuit Connections
NOTE: Use No. 18 AWG color----coded, insulated (35_C
minimum) wire. If thermostat is located more than 100 ft (30.48
m). from unit, as measured along the control voltage wires, use No.
16 AWG color--coded wire to avoid excessive voltage drop.
NOTE: All wiring must conform to NEC and local codes.
NOTE: Operating unit on improper line voltage constitutes abuse
and could affect Carrier warranty. See Table 2. Do no t install unit
in a system where voltage may fluctuate above or below
permissible limits.
See Table 2 for recommended fuse sizes. When making electrical
connections, provide clearance at the unit for refrigerant piping
connections.
NOTE: The 38HDR units use the control transformer supplied
with the matched indoor unit.
Power W
iring
Unit is factory wired for voltage shown on nameplate. Provide
adequate, fused disconnect switch within sight from unit, readily
accessible, but out of reach of children. Provision for locking the
switch open (off) is advisable to prevent power from being turned
on while unit is being serviced.
Disconnect switch, fuses, and field wiring must comply with the
NEC and local code requirements. Use copper wire only between
the disconnect switch and unit. Use minimum 60 C wire for the
field power connection.
Route power wires through the opening in unit side panel and
connect in the unit control box as shown on the unit label diagram
and Fig. 6. Unit must be grounded.
Connections to Duct Fr ee Fan Coil
Units
The 38HDR units are designed for easy match--up to 40QA duct free
fan coils. This unit provides 24 v power for the outdoor unit from the
fan coil. Connect the Y and C terminals of the indoor unit to the Y and
Cterminals.
38HDR
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