Page
9 of 40
Number
PM820010
HVAC: SmartAir eHVAC System
Location: on the control center.
F3 Fuse 20 Amp (Mini)
This fuse provides short circuit protection for the evapo-
rator blower.
Location: on the control center.
F4 Fuse 60 Amp (Maxi)
This fuse provides short circuit protection for the com-
pressor.
Location: on the control center.
B. Relays
Location: on the control center.
R1. This relay controls the voltage to the condenser fan.
R2. This relay controls the voltage to the linear power
module and evaporator blower.
R3. This relay controls the voltage to the compressor
controller.
C. Fan and Temperature Control Display
LED Display
Allows for temperature and Blower speed adjustment of
the EHVAC (Electrical Heating and Ventilation Air Condi-
tioning) unit when operating in Auto, cool or heat mode.
A/C Unit – stops when unit is shut off or batteries are
depleted.
Figure 3.
Fan and Temperature Control Display
Auxiliary heater will shut down when batteries are
depleted but will continue to run through the cool down
cycle. Also displays hours of service, battery health and
service items.
D. System and Compressor Controller
This device controls the unit and the output voltage to the
variable speed compressor. It is located under the large
access cover.
Figure 4.
System and Compressor Controller
