SUPREME FEM10-M2301CM-A, Installation Instructions And Homeowner'S Manual

7 

2.7.1. 

Humidifier and electronic air cleaner 

This unit is equipped with a 120 VAC terminal for the connection 
of accessories up to a maximum of 2 amps.  To use this 
function, a 3-wire 120/240 VAC power supply is required on the 
unit.  A humidifier and an electronic air cleaner can be wired to 
terminals “1” and “2” of the unit.  Refer to the wiring diagrams in 
this manual.  A field supplied 120/24 VAC transformer can be 
installed for accessories using 24 VAC.  A separate power 
source must be used if the accessories draw more then 2 amps. 
 
Certain accessories require control relays.  A location has been 
set aside in the unit for the installation of a relay: a 24 VAC (part 
number L01H009).  In addition, a 24 VAC relay can be wired 
between terminals “W1” and “C” to be activated during a call for 
heat.  Refer to the wiring diagrams for the location of the relay 
(R-Acc-1) on the control panel. 
 

2.7.2. 

Use of a heat pump

When using a heat pump, a kit is required that prevents the 
operation of the electric elements and the heat pump at the 
same time.  Refer to the instructions provided with the 
thermostat or the “Fossil Fuel” type kit for the proper wiring of 
the furnace and the heat pump. 
 
The simultaneous operation of the electric elements and the 
heat pump will cause overheating of either unit.  The safety 
controls of the appliances will shut down the elements, since 
they are not designed to function in this fashion. 
 
 

3 OPERATION

3.1 START-UP

 
Before starting up the unit, be sure to check that the following 
items are in compliance: 

1)  The electrical installation and ventilation; 
2)  The blower access door is in place and the blower rail 

locking screws are well tightened; 

3)  The blower speed adjustments for heating and air 

conditioning are appropriate and according to the 
specifications in this manual; 

4)  The thermostat of the room is in the heating mode and 

is set higher than the ambient temperature. 

 
To start the unit, turn the main electrical switch on. 

3.2 OPERATING 

SEQUENCE

Heating mode 

1)  The thermostat closes the R-W1 circuit, thereby 

activating the sequencers and elements of the first 
heating stage, one by one.  The blower starts up at low 
speed at the same time as the first element comes on. 

2)  Approximately 1 minute after the R-W2 circuit closes, a 

sequencer will cause the blower to go to heating speed 
(R-2 relay).  Then, the elements of the second stage 
will come on, one by one. 

Cooling mode 

1)  The thermostat closes the R-G circuit, thereby 

activating the 24 VAC R-1 relay.  The blower starts up 
to cooling speed.  The blower will also start up to 
cooling speed by way of the “Fan” switch on the 
thermostat. 

2)  The thermostat closes the R-Y contact, thereby 

activating the compressor relay of the air conditioner. 

3.3 

USE OF MANUAL FURNACE CONTROLS

 
When there is a demand for heat, the pilot light (“L-1”) comes 
on.  Refer to the wiring diagram. 
 
When the ”HI/LO” switch is put into the “LO” position, it will shut 
down approximately half the elements.  
 

However, it is important to put the switch back to the “HI” 
position during the winter months to ensure adequate 
heating. 

 
Also, this switch must remain in the “HI” position when a 2-stage 
or outdoor thermostat is used to control the electric elements of 
the second stage.  Refer to the diagram in Section 1.5) above 
(Typical 24 VAC Wiring, Thermostat). 
 
The “ON/OFF  VENT/FAN” switch engages the blower in the 
continuous low speed mode.  This will filter the air and provide 
for better air distribution in the building. 
 
The circuit breaker is there to protect the motor and control 
circuit conductors.  If the unit does not function, press the circuit 
breaker button to see if it may have disengaged due to a power 
surge.  If the breaker has to be pressed again, the unit must be 
checked by a qualified service technician.