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CIRCULATING AIR FILTERS
This heater does not have provisions for insertion of circulating air filters into the casing. How-
ever, it is recommended that a filter grille is installed or filters are installed in the return air
duct(s). If filters are installed in the return air duct the filter access must be sealed airtight.
One of the most common causes of a problem in a forced air heating system is a blocked or
dirty filter. Circulating air filters must be inspected monthly for dirt accumulation and replaced if
necessary. Failure to maintain clean filters can cause premature heat exchanger failure.
A new home may require more frequent replacement until all construction dust and dirt is re-
moved.
CAUTION
Before performing any service on this heater, including checking or replacing circulating air fil-
ters - disconnect the main power supply.
DO NOT
operate the heater for extended periods of time without circulating air filters in place.
TEMPERATURE RISE
The temperature difference between the supply air and the return air of the heater is known as
the temperature rise. This heater is designed to operate within the temperature rise displayed
on the heater series and rating plate. To ensure satisfactory performance, the temperature rise
of the heater must be measured and adjusted, if necessary. Use the following procedure to
measure and adjust the temperature rise;
•
Before starting the heater visually inspect all joints and seams in the supply and return air
ducts for leaks. Repair them if necessary.
•
Adjust the room thermostat to obtain constant operation.
•
Allow the heater to operate for at least fifteen (15) minutes.
•
With an accurate thermometer measure the temperature at the return air. If a combination
indoor / outdoor system is used, the temperature must be measured downstream of the
connection.
•
Measure the outlet air at a point approximately 1/2 meter above the heater. It may be nec-
essary to measure the outlet air at several places to obtain an accurate average. NOTE: IF
AN AIR CONDITIONING COIL IS INSTALLED ABOVE THE HEATER TAKE CARE SO AS
NOT TO DAMAGE THAT COIL.
•
Adjust the temperature by changing circulating air blower speed tap.
MOTOR LUBRICATION AND MAINTENANCE
The circulating air blower is equipped with sleeve bearings that are permanently lubricated by
the motor manufacturer and require no lubrication. At the time of the monthly filter inspection
clean the exterior of the circulating air motor, especially around the perimeter air holes to pre-
vent the possibility of overheating due to an accumulation of dust or dirt on the windings and
motor casing. As suggested elsewhere in these instructions, the air filters must be kept clean.
Dirty filters will restrict the airflow over the motor windings and possibly cause an overheating
condition.
The venter motor bearings are prelubricated by the motor manufacturer and require no atten-
tion.
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