Sterling MS - Manual (Page 21)

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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.
Inspect the suspension and/or
support system for the make-up air unit to ensure
that all fasteners are tight and the unit is secure
before working underneath the unit. Failuree to
do so could result in property damage, personal
injury, or death.
Gas tightness of the safety shut-
off valves must be checked on at least an annual
basis.
To check gas tightness of the safety shut-off valves, turn off
the manual valve upstream of the appliance combination
control. Remove the 1/8" pipe plug on the inlet side of the
combination control and connect a manometer to that
tapping. Turn the manual valve on to apply pressure to
the combination control. Note the pressure reading on
the manometer, then turn the valve off. A loss of pressure
indicates a leak. If a leak is detected, use a soap solution
to check all threaded connections. If no leak is found,
combination control is faulty and must be replaced before
putting appliance back in service.
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 Separated
Combustion 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 11). Service panels
provide easy access to the blower compartment and the
electrical cabinet. To remove the service door from any
of these compartments, refer to access panel removal
section in beginning of this manual.
Under no circumstance should
combustible material be located within the
specifi ed clearances. Failure to provide proper
clearance could result in personal injury or
property damage from fi re.
1. Follow the instructions in the maintenance section of
the of the Separated Combustion Indoor Duct Furnace
manual for servicing the furnace section of the make-
up air unit.
2. Inspect and service the blower section of the system.
3. Inspect and check the operational functions of all
safety devices equipped with your unit to ensure that
all devices are performing adequately.