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5390862-UIM-A-0318

Johnson Controls Unitary Products

4. If desired, you can unplug the conventional wire harness from the

control board and leave it in the outdoor unit for future use.

5. Replace the control box cover, removed in Step 2 of the FIELD

CONNECTIONS POWER WIRING procedures.

6. All field wiring should be in accordance with national electrical

codes (NEC) and/or local-city codes.

7. Mount the thermostat approximately 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 radiant effects from
exposed glass, appliances, drafts from outside doors, or supply
vents.

Demand Response (Load Shedding)

The main outdoor control has a conventional 24VAC input (DR) for util-
ity demand response signals. When a 24VAC signal is present on the
DR input with a

communicating system

, the HX

thermostat will

adjust the indoor temperature setpoint by the installer selected setting.
For further details on available settings, please refer to the HX

ther-

mostat installation and operation manual. With a

non-communicating

system

, a 24VAC signal on the DR terminal will not allow the system to

run in second stage, cooling operation only. The DR input terminal loca-
tion can be found in Figure 13.

DEHUMIDIFICATION CONTROL

A dehumidification control accessory 2HU06700124 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 indoor coil temperature and increasing latent
capacity. The humidistat in this control opens the humidistat contacts on
humidity rise. To install, refer to instructions packaged with the acces-
sory. Prior to the installation of the dehumidification control, the HUM
STAT jumper on the indoor variable speed air handler or furnace control
board must be set to YES.
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 a lower speed until the dehumidification
control 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 airflow of 325 cfm/ton be supplied at all times.
Refer to the Hx3 thermostat installation manual for dehumidification set-
tings.

INDOOR CFM CONFIGURATION

For proper system operation, the indoor CFM must be set properly.
The recommended airflow settings for each outdoor units size and
associated match can be found in the Outdoor Unit Technical Guide.
Manually setting the airflow on the Indoor Control is required with the
Hx™ communicating thermostat.
Set the cooling speed per the instructions, defined in the air handler or
furnace. Verify the airflow, after the configuration has be set on the
Indoor Control.

NOTICE

To eliminate erratic operation, seal the hole in the wall at the thermo-
stat with permagum or equivalent to prevent air drafts affecting the
operation of in the thermostat.

FIGURE 13:

Demand Response Wiring

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FIGURE 14:

Communicating AC with Communicating Air Handler or

Furnace

FIGURE 15:

Communicating AC with Non-Communicating Air Handler

or Furnace using Communicating Interface Control

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