Sterling ME - Manual (Page 15)

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3. Verify that the system switch is in the OFF position.
4. Check unit supply voltage to ensure that it is within
the utilization range.
5. Inspect the interior of the unit; remove any debris or
tools which may be present.
Starting Unit in Heating Mode
1. Close the unit disconnect switch which provides
power to the unit.
High voltage is present in some
areas of the unit (primarily the main electrical
cabinet) with the unit disconnect switch closed.
Failure to exercise caution when working in the
presence of energized electrical components
may result in injury or death from electrical
shock.
2. Set the thermostat/switching subbase as indicated
below: a. position the heating system switch at either
HEAT or AUTO; b. set the fan switch to AUTO.
3. Place the system switch in the ON position. With the
thermostat calling for heat, unit operation is automatic.
Starting Unit in Cooling Mode
1. Close the unit disconnect switch which provides
power to the unit.
High voltage is present in some
areas of the unit (primarily the main electrical
cabinet) with the unit disconnect switch closed.
Failure to exercise caution when working in the
presence of energized electrical components
may result in injury or death from electrical
shock.
2. Set the thermostat/switching subbase as indicated
below: a. position the cooling system switch at either
COOL or AUTO; b. set the fan switch to AUTO.
3. Place the system switch in the ON position.
With the thermostat calling for cooling, unit operation is
automatic.
Final Checkout
Run the unit sequentially through its stages of heating
and cooling. Once proper unit operation is verified,
perform these fi nal steps:
1. Inspect unit for debris and/or misplaced tools and
hardware.
2. Be sure all gas valves and controls are in the operating
position if the unit will be operating immediately.
3. Cycle unit on all safety controls to verify proper unit
operation.
4. Confirm proper operating control (thermostat or
ductstat) operation by cycling unit.
5. Secure all exterior panels in place.
VI. MAINTENANCE
HAZARDOUS VOLTAGE!
DISCONNECT ALL ELECTRIC
POWER INCLUDING REMOTE
DISCONNECTS BEFORE
SERVICING. Failure to
disconnect power before
servicing can cause severe
personal injury or death.
It is the service technician’s
responsibility to check all safety controls! Check
and test the operational functions of all safety
devices supplied with this unit. Failure to do so
could result in unsafe conditions and may result
in death, serious injury or property damage.
These units have been developed for indoor installation.
Maintenance is required and it is suggested that the
following unit servicing and inspections be performed
routinely. Also read in entirety and refer to the Indoor
Duct Furnace Manual for maintenance requirements.
Inspect area near unit to be sure that there is no
combustible material located within the minimum
clearance requirements (See Figure 5). Service panels
provide easy access to the gas controls (located in duct
furnace section), the blower compartment, the electrical
cabinet and the supply plenum. To remove the service
door from any of these compartments, refer to access
panel removal section in beginning of this manual.
The pilot burner can be serviced by removing the pilot
plate from the main burner drawer assembly.
The (rear) high limit safety switch is accessible by
removing the exterior upper jacket, then remove
the mounting plate from the side panel of the heat
exchanger. This limit must have proper surface contact
when reinstalled. The (front) primary safety limit is
accessible by removing the mounting cover from the
furnace jacket.