Rheem A180CL25E, Installation Instructions Manual

Page: 23 / 37

23
ADVISE THE CUSTOMER
1. Change the air filters regularly. The
heating system operates better, more
efficiently and more economically.
2. Arrange the furniture and drapes so
that the supply air registers and the
return air grilles are unobstructed.
3. Close doors and windows. This
reduces the heating and cooling load
on the system.
4. Avoid excessive use of exhaust fans.
5. Do not permit the heat generated by
television, lamps or radios to
influence the thermostat operation.
6. Except for the mounting platform,
keep all combustible articles three
feet from the unit and exhaust
system.
7. IMPORTANT: Replace all blower
doors and compartment cover after
servicing the unit. Do not operate the
unit without all panels and doors
securely in place.
8. Do not allow snow or other debris to
accumulate in the vicinity of the
appliance.
FURNACE SECTION
MAINTENANCE
The unit’s furnace should operate for
many years without excessive scale
build-up in flue passageways; however, it
is recommended that a qualified installer,
service agency, or the gas supplier
annually inspect the flue passageways,
the exhaust system and the burners for
continued safe operation, paying
particular attention to deterioration from
corrosion or other sources.
If during inspection the flue passageways
and exhaust system are determined to
require cleaning, the following procedures
should be followed
(by a qualified
installer, service agency, or gas
supplier):
1. Turn off the electrical power to the
unit and set the thermostat to the
lowest temperature.
2. Shut off the gas supply to the unit
either at the meter or at manual
valve in the supply piping.
LABEL ALL WIRES PRIOR TO
DISCONNECTION WHEN SERVICING
CONTROLS. WIRING ERRORS CAN
CAUSE IMPROPER AND DANGEROUS
OPERATION RESULTING IN FIRE,
ELECTRICAL SHOCK, PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
3. Remove the furnace controls access
panel and the control box cover.
4. Disconnect the gas supply piping from
the gas valve.
5. Disconnect the wiring to the induced
draft blower motors, gas valve, flame
sensor, and flame roll-out control, and
ignitor cable.
Mark all wires
disconnected for proper
reconnection
.
6. Remove the screws (4) connecting the
burner tray to the heat exchanger
mounting panel.
7. Remove the burner tray and the
manifold assembly from the unit.
8. Remove the screws (10) connecting
the two induced draft blowers to the
collector box and screws (12)
connecting the inducer mounting plate
to the heat exchanger center panel.
Remove the induced draft blowers
and the collector box from the unit.
9. Remove the turbulators from inside
the heat exchangers by inserting the
blade of a screwdriver under the
locking tabs. Pop the tabs out of the
expanded grooves of the heat
exchanger. Slide the turbulators out of
the heat exchangers.
10. Direct a water hose into the outlet of
the heat exchanger top. Flush the
inside of each heat exchanger tube
with water. Blow out each tube with air
to remove excessive moisture.
11. Reassemble (steps 1 through 9 in
reverse order). Be careful not to strip
out the screw holes used to mount
the collector box and inducer
blower. Replace inducer blower
gasket and collector box gasket with
factory replacements if damaged.
HOLES IN THE EXHAUST TRANSITION
OR HEAT EXCHANGER CAN CAUSE
TOXIC FUMES TO ENTER THE HOME.
THE EXHAUST TRANSITION OR HEAT
EXCHANGER MUST BE REPLACED IF
THEY HAVE HOLES OR CRACKS IN
THEM. FAILURE TO DO SO CAN CAUSE
CARBON MONOXIDE POISONING
RESULTING IN PERSONAL INJURY OR
DEATH.
The manufacturer recommends that a
qualified installer, service agency or the gas
supplier visually inspect the burner flames
for the desired flame appearance at the
beginning of the heating season and
approximately midway in heating season.
The manufacturer also recommends that a
qualified installer, service agency or the gas
supplier clean the flame sensor with steel
wool at the beginning of the heating
season.
DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING MAINTENANCE.
FAILURE TO DO SO MAY RESULT IN
ELECTRICAL SHOCK OR SEVERE
PERSONAL INJURY OR DEATH.
! WARNING
!
WARNING
! WARNING
VI. COOLING SECTION OPERATION
COOLING MODE
A. Call for first stage cooling
1. Zone thermostat contacts close and
a call for cooling is initiated.
2. Inputs ‘Y1’ and ‘G’ to the control are
energized.
3. Control senses ‘Y1’ and ‘G’. After 1
sec. delay, control energizes indoor
blower and first stage compressor.
4. Control enters normal operating loop
where all inputs are continuously
checked.
5. Zone thermostat is satisfied.
6. Control de-energizes indoor blower
relay after 80 second indoor blower
delay off.
7. Control in the stand by mode with
solid red LED.
B. Call for second stage cooling. After
first stage cooling established:
starting from A4.
1. If a call for second stage cooling is
initiated after a call for first stage
cooling is established, the control
energizes Y2 and energizes the
second stage compressor.
2. Control enters normal operating loop
where all inputs are continuously
checked.
C. Second stage satisfied: first stage
still called for: starting from B2.
1. Y2 is de-energized and second
stage compressor is de-energized.
D. First stage and second stage called
simultaneously.
1. Zone thermostat contacts close, a
call for first and second stage cooling
is initiated.
2. Inputs Y1, Y2 and G to the control are
energized.
3. Control senses Y1, Y2 and G, after 1
second delay, control energizes
indoor blower, first and second stage
compressor are energized.
E. First stage and second stage
removed simultaneously.
1. Upon a loss of Y1 and Y2 each
compressor is de-energized. Control
either de-energizes indoor blower
relay after 80 second indoor blower
delay off.
2. Control in the stand by mode with
solid red LED.
CONTINUOUS FAN MODE
A ‘G’ input only indicates a zone thermostat
call for continuous indoor blower operation.
VII. SYSTEM OPERATING INFORMATION