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Use this QR code to download the mobile
service app. Follow the prompts to pair the
ure the unit. Refer to the “Download Mobile
App” section in this manual and the Setup
Guide provided with this unit. The QR code
is also available in the unit control area.
The app can be downloaded from the appropriate
iOS or Android store. Look for the following icon.
The Unit Controller uses input from a zone/room sensor
cooling, a thermostat, or a third-party controller to operate
the unit. Zone/room sensor, thermostat, and third-party
controller wires are connected to J297 on the Unit Con-
troller.
Many default Unit Controller settings are adjustable. Re-
fer to the unit installation instruction or the Unit Controller
manual provided with the unit.
and accessories for proper function. Each character in the
unit installation instruction or the Unit Controller manual
provided with the unit.
5-Compressor Contactor K1
The Unit Controller closes n.o. K1 contacts to provide
power to the inverter control board (A192). The contactor
does not energize the compressor in the same manner as
a traditional cooling system. Three phase units use three
pole double break contactors with a 24 volt coil.
6-Crankcase Heater Relay K191
All units use relay K191 to control crnkcase heater HR1.
7-Power Exhaust Relay K65 (PED units)
-
B-Cooling Components
All units use a single cooling circuit consisting of a variable
-
condenser fan and a single direct drive blower. The blow-
er draws air across the evaporator during unit operation.
-
stalled economizer. The evaporator coil is slab type and
uses a thermostatic expansion valve as the primary refrig-
erant metering device. The evaporator is also equipped
protected by a high pressure switch (S4) on the discharge
-
sor, and a low pressure switch (S87) on the suction line.
1-High Pressure Switch S4
The high pressure switch is an auto-reset SPST N.C.
switch which opens on a pressure rise.
S4 is located in the compressor discharge line and wired
When discharge pressure rises to 640 ± 10 psig (4412 ±
69 kPa) (indicating a problem in the system) the switch
opens and the compressor inverter is de-energized (the
economizer can continue to operate). The switch automat-
2-Low Pressure Switch S87
The compressor circuit is protected by a loss of charge
switch located on the suction line. Switch opens at 40 psig
3-High Temperature Limit Switch S5
The variable speed compressor is equipped with a com-
pressor- mounted normally closed temperature switch that
prevents compressor damage due to overheating caused
by internal friction. The switch is located on top of the
compressor casing. This switch senses the compressor
compressor operation. The auto-reset switch closes when
and the compressor is re-energized. This switch is a sin-
gle-pole, single-throw (SPST) bi-metallic switch and is
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