Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
29
SECTION FOUR – Normal Operation and Maintenance, Cont'd.
Coil
Coils may be cleaned by removing the motor/blower
assemblies and brushing the entering air face between
fins with a stiff brush. Brushing should be followed by
cleaning with a vacuum cleaner. If a compressed air source
is available, the coil may also be cleaned by blowing air
through the coil fins from the leaving air face. This should
again be followed by vacuuming. Units provided with the
proper type of air filters, replaced regularly, will require
less frequent coil cleaning.
Electric Heater Assembly
Electric heaters typically require no normal periodic
maintenance when unit air filters are changed properly.
The operation and service life may be affected by other
conditions and equipment in the system. The two most
important operating conditions for an electric heater are
proper air flow and proper supply voltage. High supply
voltage and/or poorly distributed or insufficient air flow
over the element will result in element overheating. This
condition may result in the heater cycling on the high limit
thermal cutout. Open-strip heaters have an automatic
reset switch with a back-up, high-limit thermal switch.
Automatic reset switches reset automatically after the
heater has cooled down. High-limit thermal switches
must be replaced once the circuit has been broken. The
high-limit thermal cutout device is a safety device only,
and is not intended for continuous operation. With proper
unit application and operation, the high-limit thermal
cutout will not operate. This device only operates when
a problem exists, and ANY condition that causes high-
limit cutout MUST be corrected immediately. High supply
voltage also causes excessive amperage draw and may
trip the circuit breaker or blow the fuses on the incoming
power supply.
After proper air flow and supply power are assured,
regular filter maintenance is important to provide clean
air over the heater. Dirt that is allowed to deposit on the
heating element will cause hot spots and eventual element
burn through. These hot spots will normally not be enough
to trip the high-limit thermal cut-out device, and may not
be evident until actual heater element failure.
Figure 25. Vertical series electric heater w/protective heatshield
*NOTE – Figure 23 depicts GXY. Size and number of elements varies with model.
Figure 26. Horizontal series electric heater
*NOTE – Figure 26 depicts DXY heating elements. Size and number of elements
varies with model.
Electrical Wiring and Controls
The electrical operation of each unit is determined by the
components and wiring of the unit. This may vary from
unit to unit. Consult the wiring diagram attached to the
unit for the actual type and number of controls provided
on each unit.
The integrity of all electrical connections should be
verified at least twice during the first year of operation.
Afterwards, all controls should be inspected regularly
for proper operation. Some components may experience
erratic operation or failure due to age. Wall thermostats
may also become clogged with dust and lint, and should
be periodically inspected and cleaned to provide reliable
operation.
