5284792-UIM-D-1017
Johnson Controls Unitary Products
7
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 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, it is
recommended before starting the system to connect the thermostat to
Wi-Fi using a local network or portable hot-spot so the thermostat and
system receive the latest software updates to optimize system perfor-
mance. Utilize the Hx
TM
thermostat to “discover” the system compo-
nents and identify the Indoor and Outdoor Communicating Equipment.
AVV air handler or MVC modular blower with electric heat. Inputs to air
handler control board come from the thermostat which are communi-
cated from the main control of the outdoor unit. This maintains proper
sensible/latent balance during cooling and proper discharge tempera-
ture 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.
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.
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 7:
Typical Communicating Field Wiring (Air Handler / Furnace)
32:(5:,5,1*
&21752/:,5,1*
)$&725<:,5,1*
%
5
$
&
$
$//),(/':,5,1*72%(,1$&&25'$1&(:,7+(/(&75,&&2'(1(&$1'25/2&$/
7(50,1$/
%/2&.
&21752/
%2$5'
*1'
/8*
)851$&(25$,5+$1'/(57(50,1$/%/2&.
52207+(50267$7
287'22581,7
$//287'225:,5,1*0867%(:($7+(53522)86(&233(5&21'8&725621/<
32:(5:,5,1*
92/7&21752/:,5,1*
0,1,080*$:,5(
1(&&/$66
&
$
%
%
5
$
&
'2127
FRQQHFWWKH³5´WHUPLQDOIURPWKHWKHUPRVWDW
WRWKHXQLWFRQWUROERDUG
:+7
*51
%/.
FIGURE 8:
Demand Response Wiring
87,/,7<
6833/,('5(/$<
$
&
%
%
&
5
$
%
&
5
'5
&
2
<
$
127(
:RUNVZLWKQRUPDOO\
RSHQDQGQRUPDOO\FORVHG
XWLOLW\FRQWUROUHOD\V
9HULI\FRQWUROUHOD\FRQWDFWVDUH
UDWHGIRUDPLQLPXPRIP$WR
HQVXUHDGHTXDWHZHWWLQJFXUUHQW
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.
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