Step 7 — Make Connections to the Outdoor Unit
COOLING-ONLY SYSTEMS — To connect the 38HDC,
HDL or HDS condensing unit to the fan coil unit(s) so that
the system will operate correctly:
Route 2 field-supplied wires of 18-gage AWG (American
Wire Gage) thermostat cable between the low-voltage ter-
minal block of the fan coil unit (TB2) and the 38HDC, HDL
or HDS unit low-voltage terminal block. Connect the wires
between terminals Y and Y and between terminals C and C.
HEAT PUMPSYSTEMS — To connect the 38BK heat pump
unit to the fan coil unit so that the system will operate
correctly:
IMPORTANT: DO NOT RUN THE THERMISTOR
CABLE IN THE SAME CONDUITAS THE POWER
WIRING.
1. One thermistor connection cord with a lead length of
24 ft is shipped with the 40QNH fan coil unit. Run the
connection cord from the low-voltage terminal board in
the control box in the fan coil unit (TB3) to the heat pump
unit. Route the wire carefully so that it will not be
damaged.
2. For cooling operation, route 2 field-supplied wires of
18-gage AWG (American Wire Gage) thermostat cable
between the low-voltage terminal block of the fan coil
unit (TB2) and the 38BK unit low-voltage terminal block.
Connect the wires between terminals Y and Y and be-
tween terminals C and C.
3. For heating operation, route 3 additional wires of
18-gage AWG thermostat cable between the low-voltage
terminal block of the fan coil unit (TB2) and the 38BK
unit low-voltage terminal block. Connect the wires be-
tween terminals R and R, O and O, and G and G.
Step 8 — Install Fan Coil Unit Onto Mounting
Bracket
1. Hook the fan coil unit onto the top of the mounting bracket.
See Fig. 16.
2. Snap the fan coil unit onto the mounting bracket as shown
in Fig. 16.
IMPORTANT: An audible snapping sound will be
heard as the hook on the unit is secured into the
hole on the mounting bracket. Be sure unit is cor-
rectly mounted.
Fig. 12 — Drainage System (Rear Piping Shown)
NOTE: This shows item locations only. Front cover of fan coil unit
must be removed to access terminal boards.
Fig. 13 — Fan Coil Unit Wiring Preparation
FAN COIL UNITS
LEGEND
CONN — Connection
EQUIP GND — Equipment Ground
TB — Terminal Block
Fig. 14 — Line Power Connections
Fig. 15 — High Voltage Connections
13
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