035-16408-001 Rev. B (101)
6
Unitary Products Group
ELECTRICAL CONNECTIONS
GENERAL INFORMATION & GROUNDING
Check the electrical supply to be sure that it meets the values
specified on the unit nameplate and wiring label.
Power wiring, control (low voltage) wiring, disconnect
switches and over current protection to be supplied by the
installer. Wire size should be sized per NEC requirements
The complete connection diagram and schematic wiring label
is located on the inside surface of the unit electrical box cover
and this instruction.
POWER WIRING
1.
Install the proper size weatherproof disconnect switch
outdoors and within sight of the unit.
2.
Run power wiring from the disconnect switch to the unit.
3.
Remove the control box cover to gain access to the unit
wiring. Route wires from disconnect through power wir-
ing opening provided and into the unit control box as
shown in Figure 3.
4.
Install the proper size time-delay fuses or circuit breaker,
and make the power supply connections.
5.
Energize the crankcase heater to save time by preheat-
ing the compressor oil while the remaining installation is
completed.
ACCESSORY WIRING
The electrical accessories available for this unit are a two
stage cooling thermostat and an optional De-humidification
Control. Refer to the individual instructions packaged with the
accessories for installation.
THERMOSTAT MOUNTING / WIRING
This condensing unit must be installed with the factory rec-
ommended thermostat, 2ET04700224 or any conventional
two-stage cooling thermostat. The difference between the
two stages of a typical two-stage thermostat is 2 - 2.5 °F.
The thermostat should be located about 5 ft. above the floor,
where it will be exposed to normal room air circulation. Do not
place it on an outside wall or where it is exposed to the radi-
ant effect from exposed glass or appliances, drafts from out-
side doors or supply air grilles.
After the thermostat is mounted, route the 24-volt control wir-
ing (NEC Class 2) from the thermostat to the indoor unit and
outdoor unit. Route the control wiring into the grommeted
hole in the bottom of control box of the outdoor unit. Using
wire nuts connect to leads inside the low voltage box shown
in Figure 3 and wiring diagrams shown in Figures 4 -7.
Interconnecting control wiring must be a minimum of No. 18
AWG color coded insulated wires. If wire lengths increase
more than 90 feet, use No. 16 AWG wires, to prevent exces-
sive voltage drop.
NOTE:
To eliminate erratic operation, seal the hole in the
wall at the thermostat with permagum or equivalent
to prevent air drafts affecting the anticipators in the
thermostat.
DE-HUMIDIFICATION CONTROL
A de-humidification control accessory 2HU06700124 may be
required for variable speed air handlers and furnaces that are
installed in high humidity areas. This control provides cooling
at a reduced air flow, lowering evaporator temperature and
increasing latent capacity. To install, refer to instructions
packaged with the accessory and per Figure 4. Prior to the
installation of the de-humidistat control, the jumper across the
de-humidistat control terminals on the indoor variable speed
air handler/furnace terminal board must be removed.
During first or second stage cooling, if the relative humidity in
the space is higher than the desired set point of the de-humi-
distat control, the variable speed blower motor will operate at
a lower speed until the de-humidification control is satisfied.
A 40 - 60% relative humidity level is recommended to achieve
optimum comfort.
NOTE:
If a de-humidification control is installed, it is recom-
mended that a minimum air flow of 325 cfm/ton be
supplied at all times.
Never attempt to repair any brazed connections
while the system is under pressure. Personal
injury could result.
All field wiring must USE COPPER CONDUC-
TORS ONLY and be in accordance with Local,
National Fire, Safety & Electrical Codes. This unit
must be grounded with a separate ground wire in
accordance with the above codes.
FIGURE 3 :
OUTDOOR UNIT CONTROL BOX
START
RELAY
START
CAPACITOR
RUN
CAPACITOR
POWER
WIRING
LOW
VOLTAGE
BOX
COMFORT
ENHANCER
CONTROL
CONTACTOR
