5121495-UIM-D-0516
Johnson Controls Unitary Products
9
FIELD CONNECTIONS CONTROL WIRING
1.
Route low voltage wiring into bottom of control box as shown in
Figure 9 or 10. Make low voltage wiring connections inside the low
voltage box per Figure 11.
2.
The complete connection diagram and schematic wiring label is
located on the inside surface of the unit service access panel.
3.
Replace the control box cover removed in Step 2 of the FIELD
CONNECTINS POWER WIRING procedures.
4.
All field wiring to be in accordance with national electrical codes
(NEC) and/or local-city codes.
5.
Mount the thermostat about 5 ft. above the floor, where it will be
exposed to normal room air circulation. Do not place it on an out-
side wall or where it is exposed to the radiant effect from exposed
glass or appliances, drafts from outside doors or supply air grilles.
6.
Route the 24-volt control wiring (NEC Class 2) from the outdoor
unit to the indoor unit and thermostat.
DEHUMIDIFICATION CONTROL (Typical)
The indoor unit Installation Manual instructions for the air handler or fur-
nace describe the interface with the outdoor heat pump. A dehumidifi-
cation control accessory 2HU16700124 may be used with variable
speed air handlers or furnaces in high humidity areas. This control
works with the variable speed indoor unit to provide cooling at a
reduced air flow, lowering evaporator temperature and increasing latent
capacity. The humidistat in this control opens the humidistat contacts as
the humidity increases. Installation instructions are packaged with the
accessory. Prior to the installation of the dehumidification control, the
humidistat jumper must be set to ‘YES” on the indoor variable speed air
handler or furnace control board.
During cooling, if the relative humidity in the space is higher than the
desired set point of the dehumidification control, the variable speed
blower motor will operate at lower speed until the dehumidification con-
trol is satisfied. A 40-60% relative humidity level is recommended to
achieve optimum comfort.
If a dehumidification control is installed, it is recommended that a mini-
mum air flow of 325 cfm/ton be supplied at all times.
To see connection diagrams of all UPG equipment, the “Low Voltage
System Wiring” document is available online at www.upgnet.com in the
Product Catalog Section.
INDOOR CUBIC FEET PER MINUTE (CFM) SELEC-
TION BOARD SETTINGS (Typical)
Refer to the indoor unit Installation Manual instructions for the air han-
dler or furnace interface with the outdoor heat pump. Refer to the Out-
door Technical Guide for the recommended indoor air flow settings of
each specific heat pump. For the system to operate correctly, ensure
that the indoor CFM Selection control jumpers are properly set. Set the
indoor cooling fan speed per the instructions for the air handler or fur-
nace by selecting the correct COOL and ADJUST (or ADJ) taps. Verify
the indoor airflow by using the LED display on the indoor CFM selection
board.
SECTION VIII: SYSTEM START-UP
ENERGIZE CRANKCASE HEATER
In order to energize the crankcase heater, set the indoor cooling ther-
mostat to the OFF position. Close the line power disconnect to the unit.
WITH POWER TO UNIT AND THERMOSTAT IN COOLING
POSITION:
1. In the cooling cycle, discharge gas is pumped to the outdoor coil
which is the condenser. The indoor coil is the evaporator.
2. If fan switch is in ON position, a circuit is made through blower relay
to provide continuous blower operation.
3. With fan switch in AUTO position, a circuit is made from thermostat
cooling contact through blower relay to provide blower operation.
4. System will cycle with thermostat demand to provide cooling as
needed.
NOTICE
A Start Assist Kit is available and recommended for long line set
applications or in areas of known low voltage problems. The kit may
be required when a TXV is used (reference the Tabular Data Sheet
to determine if applicable).
NOTICE
To eliminate erratic operation, seal the hole in the wall at the ther-
mostat with permagum or equivalent to prevent air drafts affecting
the operation of in the thermostat.
FIGURE 11:
Typical Field Wiring (Air Handler / Electrical Heat) (Single-Phase)
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IMPORTANT
An attempt to start the compressor without at least 8 hours of crank-
case heat will damage the compressor.
