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One line voltage “120 HUM” 1/4” spade terminal is pro-
vided on the furnace integrated control. See Figure 60 for
integrated control conguration. This terminal is energized
in the heating mode when the combustion air inducer is
operating. Any humidier rated up to one amp can be con-
nected to this terminal with the neutral leg of the circuit be-
ing connected to one of the provided neutral terminals. If
a humidier rated at greater than one amp is connected to
this terminal, it is necessary to use an external relay relay.
One 24V ”H” 1/4” spade terminal is provided on the fur-
nace integrated control. See Figure 60 for integrated con-
trol conguration. The terminal is energized in the heating
mode when the combustion air inducer is operating and
the pressure switch is closed. Any humidier rated up to
0.5 amp can be connected to this terminal with the ground
leg of the circuit connected to ground or the ”C” terminal.
Install the room thermostat according to the instructions
provided with the thermostat. See Figure 59 for thermo-
stat designations. If the furnace is being matched with a
heat pump, refer to the thermostat installation instruction
for set up.
Indoor Blower Speeds
1 - When the thermostat is set to “FAN ON,” the indoor
blower will run continuously on the fan speed (FAN)
when there is no cooling or heating demand. See
TABLE 18 on page 56 for allowable circulation
speeds.
2 - When the ML196UHE is running in the heating
mode, the indoor blower will run on the heating
speed (HEAT). See TABLE 17 on page 56 for
allowable heating speeds.
3 - When there is a cooling demand, the indoor blower
will run on the cooling speed (COOL).
Generator Use - Voltage Requirements
The following requirements must be kept in mind when
specifying a generator for use with this equipment:
• The furnace requires 120 volts + 10% (Range:
108 volts to 132 volts).
• The furnace operates at 60 Hz + 5% (Range: 57
Hz to 63 Hz).
• The furnace integrated control requires both po-
larity and proper ground. Both polarity and proper
grounding should be checked before attempting
to operate the furnace on either permanent or
temporary power.
• Generator should have a wave form distortion of
less than 5% THD (total harmonic distortion).
TABLE 10
IGNITION CONTROL
RED LED
Flash Code
2
Diagnostic Codes / Status of Furnace
O No power to control or board fault detected
Heartbeat
1
Normal Operation - Idle, Continuous Fan, Cool
Continuous Rapid Flash Call For Heat / Burner Operation
1 Reverse Line Voltage Polarity
2 Improper Earth Ground
3 Burner failed to light, or lost ame during heat demand
4 Low Flame Signal - check ame sensor
5
Watchguard - burner failed to light, exceeded maximum number of retries or
recycles.
6 Not Used
7
Primary or Secondary Limit Open or Watchguard Mode - Limit Switch Open longer
than 3 minutes
8 Rollout Switch Open
9 Pressure Switch failed to close or opened during heat demand
10 Watchguard - Pressure Switch opened 5 times during one heat demand
11 Pressure Switch stuck closed prior to activation of combustion air inducer
12 Flame Sensed without gas valve energized
13 Low Line Voltage
Notes
Note - 1 A ”Heartbeat” is indicated by a ”Slow Flash” - 1 sec on 1 sec o, repeating
Note - 2
Error codes are indicated by a “rapid ash” - the LED ashes X times at ½ second on ½
second o, remains o for 3 seconds then repeats.
Note - 3
Last 10 error codes are stored in memory including when power is shut o to the
unit. - To recall, pressand release button, most recent will be displayed rst, LED o for 3
sec, then next error code is displayed, etc. To clear error codes, depress and hold button
longer than 5 seconds.
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