SUPREME FEM15-E230V1M-A, Manual

5 

2.4 ELECTRICAL 

SYSTEM

 
The 

SUPREME

 furnace is completely pre-wired and all field 

wiring must be connected to the terminal blocks on the unit.  It 
requires a 240 volt, 2-wire power supply. 
 

WARNING 

Risk of fire. 

The conductor sizing must conform to the last edition of 
the local or national codes. 

Failure to follow this rule can result in death, bodily injury 
and/or property damage. 

Power supply to the unit can be made using copper or 
aluminum wires. The wire size must be decided in accordance 
to unit power consumption, the over current protection type and 
capacity, the wire type and length, and the environment where 
the unit is installed. If an aluminum wire is used, other 
precautions must be taken to insure the conformity of the 
installation. In all cases, all the factors affecting the wire gauge 
must be considered and the installation codes followed. 
 
The exterior of the unit must have an uninterrupted ground to 
minimize the risk of bodily harm.  A ground terminal is supplied 
with the control box for that purpose. 
 
In the event that wires inside the unit require replacement, these 
must be copper wires only with same temperature rating as 
originals.

2.5 

INSTALLATION OF THE THERMOSTAT

 
A thermostat must be installed to control the temperature of the 
area to be heated.  Follow the instructions supplied with the 
thermostat.  Install the thermostat on an interior wall in a 
location where it will not be subject to direct sun light, lamps, air 
diffusers, fireplaces, etc.  Seal openings in walls to avoid air 
currents that may influence the operation of the thermostat.  
Also refer to the wiring diagrams provided with the heating/air 
conditioning unit.  The connections must be made as indicated 
on the following diagrams and the electrical diagram, Figure 9, 
p.12. 
 

1-stage thermostat, heating only 

2-stage thermostat, heating only 

2-stage heating & 1-stage air conditioning & heat pump 

thermostat 

2-stage heating & 2-stage air conditioning & heat pump 

ther dehumidification mode 

2.5.1. 

Thermostat heat anticipator adjustment (if 
required) 

Certain thermostats are equipped with a heat anticipator that 
must be adjusted according to the instructions supplied.  This is 
to ensure that the heating mode is comfortable and economical. 
 
Generally speaking, on a single stage thermostat, a reading of 
the current must be taken with an ammeter as follows: 

1)  Move the anticipator to its highest setting, rendering it 

ineffective. 

2)  Remove the wire from the “W1” terminal and connect 

an ammeter between the terminal and the wire. 

3)  Call for heat by raising the set point on the thermostat 

and allow the furnace to run for 3 to 4 minutes to reach 
its peak output.