Step 6 — Make Electrical Connections — Be sure
field wiring complies with local building codes and NEC,
and unit voltage is within limits shown in Table 6. Refer to
Table 7 for units with electric heat.
Contact local power company for correction of improper
line voltage.
To avoid personal injury or damage to unit, do not make
electrical connections until all power sources are shut
down, locked out, and tagged off. Failure to do so could
result in personal injury or unit damage.
Operation of unit on improper line voltage constitutes
abuse and could affect warranty. Refer to Table 6 for
permissible operating limits. Do not install unit in sys-
tem where voltage may fluctuate above or below per-
missible limits.
NOTE: Use type NM power cable only (per NEC; provided
for fan coil units only) between disconnect switch and unit.
NOTE: Install branch circuit disconnect per NEC of ad-
equate size to handle unit starting current. Locate disconnect
within sight from and readily accessible from unit, per
Section 440-14 of NEC. Some codes allow indoor unit to
share disconnect with outdoor unit if disconnect can be locked;
check local code before installing in this manner. To make
electrical connections:
1. Remove the screws holding the front cover of the fan coil
unit, and remove front cover. Save screws and screw
covers for reinstallation.
2. Remove control box strain relief clamp (see Fig. 13).
3. Remove any factory test leads still connected to the power
terminal box. These leads (if applicable) are for factory
testing only and cannot be used for power connections.
4. Route the factory-supplied ground and power wires from
terminal block 1 (TB1) to the field-supplied disconnect
switch.
According to NEC and most local codes, the unit
must have an uninterrupted, unbroken ground to mini-
mize personal injury if an electrical fault should oc-
cur. The ground may consist of electrical wire or
metal conduit when installed in accordance with ex-
isting electrical codes. Failure to follow this warn-
ing could result in an electric shock, fire, or death.
5. Route factory-supplied line power leads (see Fig. 14) from
field-supplied, indoor unit disconnect to the fan coil unit
TB1 (see Fig. 14 and 15). Run wire through the strain
relief on the control box (see Fig. 13). When routing wire
in the fan coil unit, keep the wire away from refrigerant
and condensate piping and any sharp edges on the unit.
Do not short circuit the 40QN transformer − it is
fused. The transformer can be short circuited by con-
necting the wrong wires or by touching a live wire
to the side of a grounded control box.
Table 6 — Electrical Data
INDOOR
UNIT
40QN
V (Single-
Ph, 60 Hz)
OPERATING VOLTAGE* FAN
WATTS MCA
MAX FUSE
OR HACR TYPE
CKT BKR AMPS
Max Min LRA FLA
B018
208/230 253 187 3.2 0.53 94 10.9 15
B024
H018
H024
LEGEND
FLA — Full Load Amps
HACR — Heating, Air Conditioning, and Refrigeration
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps per NEC Section 430-24
NEC — National Electrical Code
*Permissible limits of the voltage range at which unit will operate satisfactorily.
Table 7 — Electric Heater Data
INDOOR UNIT VOLTS-Ph (60 Hz) INPUT AMPS kW AT 230 V MIN WIRE SIZE (AWG)
40QNH018 230-1 7.8 1.8 14
40QNH024 230-1 7.8 1.8 14
LEGEND
AWG — American Wire Gage
12
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