7
accordance with the NEC and any local codes or ordinances that
may apply. Use copper wire only.
The unit must have a separate branch electric circuit with a
field--supplied disconnect switch located within sight from, and
readily accessible from, the unit.
On units with a factory--installed disconnect with pull--out
removed, service and maintenance can be safely performed on
only the load side of the control package.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Field wires on the line side of the disconnect found in the
fan coil unit remain live, even when the pull--out is
removed. Service and maintenance to incoming wiring
cannot be performed until the main disconnect switch
(remote to the unit) is turned off.
!WARNING
A. Line Voltage Connections
If unit will contain accessory electric heater, remove and discard
power plug from fan coil and connect male plug from heater to
female plug from unit wiring harness. (See Electric Heater
Installation Instructions.)
For units without electric heater:
1. Connect 208/230v power leads from field disconnect to
yellow and black stripped leads.
2. Connect ground wire to unit ground lug.
NOTE: Units installed without electric heat should have a
field--supplied sheet metal block--off plate covering the heater
opening. This will reduce air leakage and formation of exterior
condensation.
B. 24--v Control System
Connection To Unit
Wire low voltage in accordance with wiring label on the blower.
(See Fig. 10 through 15.) Use no. 18 AWG color--coded,
insulated (35_C minimum) wire to make the low--voltage
connections between the thermostat, the unit, and the outdoor
equipment. If the thermostat is located more than 100 ft from the
unit (as measured along the low--voltage wire), use no. 16 AWG
color--coded, insulated (35_C minimum) wire. All wiring must be
NEC Class 1 and must be separated from incoming power leads.
Refer to outdoor unit wiring instructions for any additional
wiring procedure recommendations.
Transformer Information
Transformer is factory--wired for 230v operation. For 208v
applications, disconnect the black wire from the 230v terminal on
transformer and connect it to the 208v terminal. (See Fig. 16.)
Heater Staging
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
If W2, W3, and E on any 3 stage heater (18, 20, 24, or
30kW) are individually connected as with outdoor
thermostats or any other situation, emergency heat relay
must be used. This relay is in kit Part No. KHOT0201SEC
and is normally used with kit Part No. KHAOT0301FST
for 2 outdoor thermostat systems.
CAUTION
!
The controls are factory circuited for single--stage operation. For
2--stage operation, use outdoor thermostat kit Part No.
KHAOT0301FST, and for 3--stage use both kits Part No.
KHAOT0201SEC and KHAOT0301FST.
When 2 stages are desired, cut W3 at the W2 wire nut, strip and
reconnect per the thermostat kit instruction. (See Fig. 13.) When
3 stages are desired, cut the W2 wire nut off and discard. Strip
W2, W3, and E and reconnect per thermostat kit instructions.
(See Fig. 14.)
NOTE: When 3 stages are used or anytime the E terminal is not
tied to W2, the emergency heat relay, part of outdoor kit Part No.
KHAOT0201SEC must be used.
C. Manufactured Housing
In manufactured housing applications, the Code of Federal
Regulations, Title 24, Chapter XX, Part 3280.714 requires that
supplemental electric heat be locked out at outdoor temperatures
above 40_F, except for a heat pump defrost cycle. Refer to Fig.
15 for typical low voltage wiring with outdoor thermostat.
D. Ground Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
According to NEC, ANSI/NFPA 70, and local codes, the
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.
If conduit connection uses reducing washers, a separate
ground wire must be used.
!WARNING
NOTE: Use UL--listed conduit and conduit connector for
connecting supply wire(s) to unit to obtain proper grounding.
Grounding may also be accomplished by using grounding lugs
provided in control box.
E. Minimum CFM and Motor Speed Selection
Units with or without electric heaters require a minimum CFM.
Refer to the unit wiring label to ensure that the fan speed selected
is not lower than the minimum fan speed indicated.
FY4A fan speed selection is done at the fan relay printed--circuit
board. To change motor speeds, disconnect fan lead used on relay
terminal (SPT) and replace with motor speed tap desired. (See
Fig. 17.) Save insulating cap and place on motor lead removed
from relay.
NOTE: In low static applications, lower motor speed tap should
be used to reduce possibility of water being blown off coil.
Most units have 3 motor speed taps. Low speed (red) is designed
for mismatched outdoor unit applications. Medium speed (blue)
is designed for straight matched operations. High speed (black) is
used with high external static duct systems of straight matched
systems.
The fan speed selection on the FX4C models is done at the motor.
To change motor speeds, disconnect fan lead from terminal 2 and
move to desired speed tap; Low speed (one), Medium (two), and
High (three).
FX4C / FY4A
