Operating instructions

14
1
2
3
10
11
12
9
6
23
6
5
8
9
11
12
L2
L2L2
L2
D1
L1
L1 UNUSED HEAT
COOL
FS
K2
K1
R8
R10
R3
K4
K3
R31
LED
1
0
6
8
-
8
3
-
4
0
0
A
C27
D3
R38
D9
D10
R34
R35
R4
R11
R42
D12
R36
D11
D14
C20
Z
1
R29
R22
C13
R25
D5
D7
Control Board
NOTE: If necessary, adjust HEAT FAN OFF delay settings to obtain
satisfactory comfort level.
COOLING STARTUP
NOTE: Check all manual reset limit controls in heating circuit if cooling
mode does not operate.
Compressor Protection Devices
The compressor includes components which are designed to
protect the compressor against abnormal operating conditions.
WARNING
T
O PREVENT PERSONAL INJURY OR DEATH, ALWAYS DISCONNECT ELECTRICAL
POWER BEFORE INSPECTING OR SERVICING THE UNIT.
A
LL COMPRESSOR
PROTECTION DEVICES RESET AUTOMATICALLY, ENERGIZING THE CONTACTOR
AND OUTDOOR FAN.
Operating Instructions (Cooling)
NOTE: Mechanical cooling cannot be reliably provided at
ambient temperatures below 50° F.
1. Turn on the electrical power supply to the unit.
2. Place the room thermostat selector switch in the COOL
position (or AUTO if available, and if automatic changeover
from cooling to heating is desired).
3. Set the room thermostat to the desired temperature.
TROUBLESHOOTING
ABNORMAL OPERATION - HEATING
The following presents probable causes of questionable unit
operation. Remove the control box access panel and note the
number of diagnostic LED flashes. Refer to Diagnostic Indicator
Chart for an interpretation of the signal and to this section for
an explanation.
Internal Lockout
If the integrated ignition control in this unit encounters an internal
fault, it will go into a “hard” lockout and turn off the diagnostic
LED. If diagnostic LED indicates a hard lockout, check power
supply to unit for proper voltage, check all fuses, circuit breakers
and wiring. Disconnect electric power for five seconds. If LED
remains off after restoring power, replace control.
External Lockout
An external lockout occurs if the integrated ignition control
determines that a measurable combustion cannot be established
within three (3) consecutive ignition attempts. If flame is not
established within the seven (7) second trial for ignition, the
gas valve is deenergized, 15 second inter-purge cycle is
completed, and ignition is re-attempted. The control will repeat
this routine three times if a measurable combustion is not
established. The control will then shut off the induced draft
blower and go into a lockout state.
If flame is established but lost, the control will energize the
circulator blower at the heat speed and then begin a new ignition
sequence. If flame is established then lost on subsequent
attempts, the control will recycle for four (4) consecutive ignition
attempts (five attempts total) before locking out.
The diagnostic fault code is 1 flash for a lockout due to failed
ignition attempts or flame dropouts. The integrated control will
automatically reset after one hour, or it can be reset by removing
the thermostat signal or disconnecting the electrical power
supply for five seconds.
Important: If you have to frequently reset your gas/electric
package unit, it means that a problem exists that should be
corrected. Contact a qualified servicer for further information.
Pressure Switch Stuck Open
A pressure switch stuck open can be caused by a faulty pressure
switch, faulty wiring, a disconnected or damaged hose, a blocked
or restricted flue, or a faulty induced draft blower.
If the control senses an open pressure switch during the pre-
purge cycle, the induced draft blower only will be energized. If
the pressure switch opens after ignition has begun the gas valve
is deenergized, the circulator blower heat off cycle begins, and
the induced draft blower remains on. The diagnostic fault code
is two flashes.
Pressure Switch Stuck Closed
A stuck closed pressure switch can be caused by a faulty
pressure switch or faulty wiring. If the control encounters a
pressure switch stuck closed, the induced draft blower remains
off. The diagnostic LED code for this fault is three (3) flashes.
Open Thermal Protection Device
If a primary, auxiliary, or rollout limit switch opens, the gas valve
is immediately deenergized, the induced draft and air circulating
blowers are energized. The induced draft and air circulator
blowers remain energized until the limit switch recloses. The
diagnostic fault code for an open limit is four (4) flashes.
A primary limit will open due to excessive supply air
temperatures. This can be caused by a dirty filter, excessive
duct static, insufficient air flow, or a faulty limit. Check filters,
total external duct static, blower motor, blower motor speed tap
(see wiring diagram), and limit. This limit will automatically reset
once the temperature falls below a preset level.
An automatic reset auxiliary limit is located on the circulator
blower scroll. A dirty filter, excessive duct static, insufficient air
flow, a faulty limit, or a failed circulator blower can cause this
limit to open. Check filters, total external duct static, circulator
blower motor, blower motor speed tap (see wiring diagram),
and limit. An interruption in electrical power during a heating
cycle may also cause the auxiliary limit to open. The secondary
limit is located on top of the circulator blower assembly (see