NOTE:
Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage may fluctuate above or below
permissible limits.
NOTE:
Use copper wire only between disconnect switch and
unit.
NOTE:
Install branch circuit disconnect of adequate size per
NEC to handle unit starting current. Locate disconnect within sight
from and readily accessible from unit, per Section 440-14 of NEC.
ROUTE GROUND AND POWER WIRES
Remove access panel and control box cover to gain access to unit
wiring. Extend wires from disconnect through power wiring hole
provided and into unit control box. Size wires per NEC but not
smaller than minimum wire size shown in Product Data Digest.
The unit cabinet must have as 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. Failure to follow this warning can result in an
electric shock, fire, or death.
CONNECT GROUND AND POWER WIRES
Connect ground wire to ground connection in control box for
safety. Connect power wiring to leads provided as shown in Fig.
11.
CONNECT CONTROL WIRING
Route 24v control wires through control wiring grommet and
connect to leads provided in control box. (See Fig. 12.)
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft from unit, as measured
along the control voltage wires, use No. 16 AWG color-coded wire
to avoid excessive voltage drop.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
The outdoor unit requires a minimum of 27-va, 24v control power.
FINAL WIRING CHECK
IMPORTANT:
Check factory wiring and wire connections to
ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
Step 9—Install Electrical Accessories
GENERAL
Refer to the individual instructions packaged with kits or acces-
sories when installing. The liquid line solenoid valve accessory is
available on these units. See Fig. 13 for wiring diagram.
Available electrical accessories include latent capacity control.
LATENT CAPACITY CONTROL (LCC)
The purpose of an LCC is to provide a dehumidification mode to
assure a 75 percent or less system sensible heat ratio. If indoor unit
installed contains an ICM blower (such as an FK4, FV4, or 40FK
fan coil or a 58UHV, 58UXV, or 58MVP gas furnace), no LCC is
required. The LCC for standard PSC blower products consists of a
standard humidistat which opens contacts on humidity rise and a
pilot duty relay with 24v coil.
NOTE:
If an LCC is desired, low-speed airflow must be main-
tained so that a minimum of 300 CFM/ton can be supplied during
high-speed LCC operation.
Step 10—Make Airflow Selections
AIRFLOW SELECTION FOR 58UHV, 58UXV FURNACES
The 58UHV, 58UXV Non-Condensing Variable-Speed Furnaces
provide high- and low-speed blower operation to match the
capacities of compressor high and low speeds. To select recom-
mended airflow, refer to the 58UHV, 58UXV Installation Instruc-
tions. These settings are made on the furnace airflow selector
board by moving the appropriate color-coded jumper wires. The
ORANGE jumper wire should be set to the HP—EFFY position
for heat pump best efficiency or HP—CMFT for heat pump
enhanced comfort. The YELLOW COOL SIZE jumper is used to
select airflow to match the needed tons of cooling. The BLUE
CFM/TON jumper wire is used to select slight adjustments to
airflow of 400, 350, or 315 CFM per ton. (See Furnace Installation
Instructions for setting required airflow.)
AIRFLOW SELECTION FOR 58MVP FURNACES
The 58MVP Condensing Variable-Speed Furnaces provide high-
and low-speed blower operation to match the capacities of com-
pressor at high and low speeds. To select recommended airflow,
refer to the 58MVP Installation Instructions. The 58MVP utilizes
a control center that allows the installing technician to select
proper airflows. For adjustments to the manual switches labeled
A/C and CF and recommended switch positions, refer to Furnace
Installation Instructions for setting required airflow. High-speed
airflow is determined by the position of the A/C switches, and
low-speed airflow is determined by the position of the CF
switches.
AIRFLOW SELECTION FOR FK4, FV4, OR 40FK FAN COILS
The FK4, FV4, and 40FK provides high- and low-speed blower
operation to match the capacities of compressor at high and low
speeds. To select recommended airflow, refer to the FK4, FV4, or
40FK Installation Instructions. The FK4, FV4, and 40FK utilizes
an EASY SELECT control board that allows the installing
technician to select proper airflows. The ORANGE SYSTEM
TYPE
JUMPER
wire
should
be
set
to
HP—EFF
or
HP—COMFORT. The BLUE AC/HP SIZE JUMPER is used to
select airflow to match the outdoor unit nominal size in tons of
cooling. The BLACK AC/HP CFM ADJUST jumper is used to
make slight adjustments to the selected airflow tonnage. (See
Fig. 11—Line Power Connections
A91306
CONTACTOR
DISCONNECT
PER N. E. C. AND/ OR
LOCAL CODES
FIELD POWER
WIRING
FIELD GROUND
WIRING
GROUND
LUG
6
