Thermostat; Thermostat Location; Thermostat Heat Anticipator Setting; Start Up Procedures - Fedders FV95A054 Installating And Operation Manual

ISOLATION RELAY

THERMOSTAT

R
G
Y
W
24V
115V

THERMOSTAT LOCATION

The thermostat should be located approximately 5 feet above
the floor, on an inside wall where there is good natural air
circulation, and where the thermostat will be exposed to
average room temperatures. Avoid locations where the
thermostat will be exposed to cold drafts, heat from nearby
lamps or appliances, exposure to sunlight, heat from inside
wall stacks, etc.
THERMOSTAT HEAT ANTICIPATOR SETTING: 0.45 AMP (White-
Rodgers) See page 39 for information on connecting optional
accessories such as electronic air cleaners and power
humidifiers.
ELECTRICAL WIRING AND COMPONENTS MUST BE PROTECTED
FROM MOISTURE, INCLUDING WATER AND CONDENSATE.
DEHUMIDIFICATION OPTION
The controller has a dehumidification option. When high
humidity is sensed (requires a 24 volt Humidistat that opens on
high humidity) the air flow is reduced to increase condensing.
To activate, the jumper labeled "DEHUM" must be moved to
the "yes" position.
AIRFLOW
WARNING
ALL CONTROLLER JUMPER CHANGES MUST BE MADE
WITH POWER DISCONNECTED TO THE FURNACE.
The ECM TM blower is preprogrammed from the factory to
hold constant flow. (Replacement motors must have the
correct part number and can only be ordered from the furnace
manufacturer.) Changing the Taps allow adjustment for various
size A/C tonnage as well as an adjustment in flow. Changing
the Heating Tap changes the Temperature Rise in about 5 F
increments. The Taps are in a row of jumper labeled "COOL",
"HEAT" and "ADJUST".
Table on page 36 shows the recommended taps for heating
and cooling speed. Heating Tap A is factory set for heating speed.
If the Adjust Tap is used for cooling then the heating speed
should be adjusted to counter the effects of the adjustment
tap. Rule of thumb: The Heating Tap will be the same as the
"ADJUST" Tap.
COOLING
Y
CONTACTOR
G
FAN
RELAY
W
HEATING RELAY
Make adjustments to the controller with the electrical
power off.

START UP PROCEDURES

This furnace is equipped with a hot surface ignition (HSI)
device. Each time that the room thermostat calls for heat,
the HSI lights the main burners directly. See the lighting
instructions on the furnace.

To Start The Furnace:

1. Remove the burner compartment access door.
2. Shut off the electrical power to the furnace and set the
room thermostat to its lowest setting.
3. Ensure that the ignition system control switch on the
gas valve is in the "ON" position.
4. Replace the burner compartment access door.
5. Restore electrical power to the furnace.
6. Set the room thermostat to a point above room
temperature to light the furnace.
7. After the burners are lit, set the room thermostat to the
desired temperature.

To Shut Down The Furnace:

1. Set the room thermostat to its lowest setting.
2. Remove the burner compartment access door.
3. The ignition system control switch on the gas valve may
be switched to the "OFF" position.
4. The furnace appliance shutoff valve may be closed if
desired.
SHOULD OVER HEATING OCCUR, OR THE GAS BURNERS
FAIL TO SHUT OFF, CLOSE THE MANUAL GAS VALVE FOR
THE FURNACE BEFORE SHUTTING OFF THE ELECTRICAL
POWER TO THE FURNACE. FAILURE TO DO SO CAN
CAUSE AN EXPLOSION OR FIRE RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.

Sequence of Operation

1. Room temperature drops causing the room thermostat
heating W1 contacts to close.
2. The inducer blower is energized at high speed and the
control waits for the low pressure switch contacts to
close.
3. Once the low pressure switch contacts close, a 15-
second pre-purge is initiated.
changes to low speed and the 120VAC ignitor is
powered.
4. After the prepurge period, the hot surface ignitor
heats up; 10 seconds on a first try, maximum 14 seconds
on a subsequent retry.
33
WARNING
WARNINGi
Then the inducer