18
CompleteControl Wiring
1. Run the control wiring close to the term inal block on the
indoorunit.
2. Connect thewires as shown in Fig 18 and Fig. 20 for
38HDRunits, and Fig. 19 and Fig. 21 for38QRR units.
Complete Power Connection To Indoor Unit
Be sure field wiring complies with local building co des and NEC,
and unit voltage is within limits shown in Table 12.
Contact local power company fo r correction of improper line
voltage.
!WARNING
ELECTRICALSHOCK HAZARD
Failureto follow this warningcould result in personalinjury
ordeath.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tagswitch w ith asu itable warning label.
CAUTION
!
UNITDAMAGE HAZARD
Failure to follow this caution may result in equipment damag e
orimproper operation.
Unit failure as a result of operation on improper line voltage or
excessive phase imbalance constitutes abu se and may cause
damage toelectrical components. Suchoperation could void
any applicable Carrier warranty.
NOTE: Use copper wireonly between disconnect switch(es)and
unit.
NOTE: Install branch circuitdisconnect of adequatesize to handle
unit startingcurrent per NEC. Locate disconnect within sight of,
and readily accessible from, unit, per section 440--14 of NEC.
Some codes allow indoor unitto share disconnect with outdoor
unit if disconnect can b e locked; check local code b efore installing
in this manner.
1. Route ground and powerwires.
!WARNING
ELECTRICALSHOCK HAZARD
Failureto follow this warningcould result in personalinjury
ordeath.
Accordingto NEC and most local codes, the unit must have
an uninterrupted, unbroken ground to minimize personal
injury if an electric fault should occur. The ground may
consistof electrical wire or metal conduitwhen installed in
accordance with existing electrical codes.
2. Route line power leadsfrom inside disconnect to the fan
coil.Place wire through thewhole on the control box.
3. Connect wire to high voltageterminal board (TB1) and
groundscrew.
NOTE:Whenrouting the wire in the unit, usecare to keep the
wire away from refrigerantand condensate piping and any
sharp edges.
NOTE:The 208/230--vunits are factory wired for 230--v to
24--v transformer operation, For 208--v to 24--v operation,
interchangethe blue (208--v) and red (230--v) wires. Cap any
unusedwires with wirenuts.
Install Thermostat
These systems use a three speed thermostat. Refer to Table 9 for a
listof recommended thermostats.
1. Mount thermostatto a wall in the occupied space using
hardwareprovided with the thermostat.Locate the thermo-
stat,p referably on an interior wall, in an areath atis not sub-
jectedto drafts ordirect sunlight through windows.
2. Run the thermostatwires to the control box of the indoor
unit.If running the thermostat through theback of the unit,
3/8in. space between the unit and thewall is required.
3. Route wires overrefrigerant and drain piping as shownin
Fig.24.
*
Field-supplied.
A09533
Fig.24 --Routing WiresOver Piping
NOTE:Do not route wiresunder the piping, or wires could
impedeair filter removal.
4. Connect the thermostatwires to the indoor unit per Fig 25
fora 40QAC unit and Fig. 26 for a 40QAQ unit.
40QAC/38HDR -- 40QAQ/38QR
R