5284792-UIM-A-0317
8
Johnson Controls Unitary Products
Demand Response
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 the HX
TM
thermostat will adjust the indoor temperature set-
point by the user selected setting. For further details on available set-
tings, please refer to the HX
TM
thermostat installation and operation
manual. The DR input terminal location can be found in Figure 10 and
typical wiring is found in Figure 8.
SECTION VI: SYSTEM CHARGE
After completion of system connections, apply power to the system. Uti-
lize the Hx
TM
thermostat to “discover” the system components and
identify the Indoor and Outdoor Communicating Equipment. Upon com-
pletion of system identification and setup airflow as described
below.Inputs to air handler control board come from the thermostat
which are communicated from the main control of the outdoor unit. This
maintains proper sensible/latent balance during cooling and proper dis-
charge temperature during heating.
Proper indoor unit airflow is determined by the system and requires no
initial set-up by the installing contractor unless using an AVV or MVC
modular blower air handler with electric heat. If a unit is using electric
heat, the unit must have the electric heat airflow set at the air handler
control board. Refer to Table 14 when operating the air handler with the
electric heat section.
After the system is started during the initial set-up process using the
Hx
TM
thermostat, additional fine tuning of the airflow is accomplished by
selecting on of the three operating profiles. The three operating profiles
include: humid, dry or normal. Select the one that best reflects the out-
door environment where the conditioned space is located. This selec-
tion adjusts the how the indoor blower and the compressor work
together to manage temperature and humidity. Additional fine tune
adjustments are available using the Hx
TM
thermostat. Refer to the Hx
TM
thermostat manual for additional detail.
The proper airflow is determined by the main outdoor control in the out-
door unit.
To ensure that your unit performs at the published levels, it is important
that the indoor airflow is determined and refrigerant charge added
accordingly.
CHARGING THE UNIT
The factory charge in the outdoor unit includes enough charge for the
unit, 15 ft. (4.6 m) of refrigerant piping, and the smallest indoor coil/air
handler match-up. Some indoor coil / air handler matches may require
additional charge.
See Tabular Data Sheet provided in unit Customer Booklet for charge
requirements. The “TOTAL SYSTEM CHARGE” must be permanently
marked on the unit data plate.
FIGURE 8:
Demand Response Wiring
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CAUTION
If the outdoor temperature is below 55°F, an attempt to start the com-
pressor without at least 2 hours of crankcase/stator heat can damage
the compressor.
CAUTION
Refrigerant charging should only be carried out by a licensed quali-
fied air conditioning contractor.
!
!
FIGURE 9:
System Charging Connections
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CAUTION
Compressor damage will occur if system is improperly charged. On
new system installations, charge system per tabular data sheet for
the matched coil and follow guidelines in this instruction.
!
CAUTION
Do not leave the system open to the atmosphere. Unit damage could
occur due to moisture being absorbed by the POE oil in the system.
This type of oil is highly susceptible to moisture absorption.
!
