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3.4
AIRFLOW VERIFICATION
Verify the airflow by taking readings of the following points,
while the elements are in the heating mode:
•
Total amperage of all the heating elements;
•
Voltage at the furnace;
•
Supply air temperature. The point of the reading must
not be affected by radiant heat from the elements;
•
Return air temperature.
From these readings, one can arrive at an approximate
calculation of the average airflow.
formulae should be used:
0.82 x amps. x volts
Liter/s= -------------------------
Diff. temperature ˚C
3.1 x amps. x volts
CFM = ------------------------
Diff. temperature ˚F
3.4.1.
Supply Air Temperature Rise Test
1)
Operate the unit at maximum power for at least 10
minutes;
2)
Measure the air temperature in the return air plenum;
3)
Measuring the air temperature in the largest trunk
coming off the supply air plenum, just outside the
range of radiant heat from the heat exchanger. 0.3 m
(12") from the plenum of the main take-off is usually
sufficient;
4)
The temperature rise is calculated by subtracting the
return air temperature from the supply air temperature.
If the temperature rise exceeds the temperature specified in
Table 1, p.10, change to the next higher blower speed tap, until
the temperature rise falls to the target or below. If the excessive
temperature rise cannot be reduced by increasing fan speed,
investigate for ductwork obstructions or dirty and improper air
filter.
CAUTION
It is important to check the airflow and to ascertain that the unit
does not operate above the temperatures specified in the
Technical Specifications (Table 1). This is particularly important
if a cooling coil or a heat pump has been installed in the ducts.
Hi-Limit thermal protectors should never need to engage during
the normal functioning of the appliance.
designed to engage during the improper functioning of the
blower or when the filter was improperly maintained.
3.4.2.
High limit verification
After operating the furnace for at least 15 minutes, restrict the
return air supply by blocking the filters or the return air register
and allow the furnace to shut off on High Limit. The electric
heaters must deactivate themselves one by one before the
warm air temperature exceeds 200˚F
Remove the obstruction and the elements should restart after a
few minutes.
8
To do that, the following
They are strictly
4 MAINTENANCE
WARNING
Electrical shock hazard.
Turn OFF power to the furnace before any disassembly or
servicing.
Failure to do so can result in death, bodily injury and/or
property damage.
Preventive maintenance is the best way to avoid unnecessary
expense and inconvenience.
inspected by a qualified service technician at regular intervals.
Do not attempt to repair the furnace or its controls.
qualified service technician.
Before calling for repair service, check the following points:
1)
Check fuses or the circuit breaker;
2)
Check if the 15 A circuit breaker on the furnace is
disengaged;
3)
Set the thermostat higher than room temperature. If
the unit does not start up, cut the power and call la
qualified service technician.
When calling for service or ordering a replacement part, specify
the model and serial number of your appliance.
4.1
AIR FILTER
The filter supplied with the unit is the disposable type and
should be replaced twice a year. The presence of animal hair,
dust, etc. may necessitate more frequent changes. Dirty filters
have an adverse effect on the performance of the central
heating system.
4.2
MOTOR LUBRICATION
Do not lubricate the blower motor, since it is permanently
lubricated.
Have your heating system
Call a
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