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•
The vent pressure
switch will close when it detects a pressure
in excess of it's setting.
If the
pressure
switch fails to close the status light will flash three (3) times. The sequence
cannot
continue
until the pressure
switch closes.
•
The flame rollout switches
are then checked
to assure that they are in the closed position.
•
After a pre-purge
of about fifteen (15) seconds
the electronic
ignition device will be energized.
•
After a slight delay the gas valve will open if the flame rollout swithches
are closed.
•
The burners will ignite and the flame sensor will detect the presence
of flame. The ignition
device will deenergize.
If the sensor does not detect the burner flame, the gas valve will close
and the ignition cycle will be repeated
for a total of three attempts.
If, after the third attempt,
the presence
of flame is not detected,
the furnace
will go into a lockout condition
for one (1)
hour. It will then repeat the ignition cycle. This one (1) hour lockout and retry will occur
indefinitely.
•
Thirty (30) seconds
after the main valve is energized
the circulating
air blower will be activated.
•
The furnace will remain in operation
until the demand
for heat is satisfied.
•
Once the demand
is satisfied the venter will shut off, and the circulating
air blower will shut off
after the field selectable
time off is attained.
•
The furnace will remain dormant
until the next demand
for heat.
COOLING
MODE
•
A demand
for cooling is initiated.
•
The control checks for an open limit. If an open limit is detected
the furnace
will remain
inoperable
until the condition
is corrected.
During an open limit condition
the circulating
air
blower will be energized.
The status light will blink four (4) times.
•
The condenser
contactor
will close.
•
After approximately
five (5) seconds
the circulating
air blower will start on the cooling speed.
•
After the room thermostat
is satisfied the condenser
contactor
will open.
•
The circulating
air blower will remain in operation
for approximately
sixty (60) seconds.
I
REMOVING
AN EXISTING
APPLIANCE
]
When replacing
an existing appliance,
the resulting installation
must comply with all local codes,
or in the absence
of local codes, to the National
Fuel Gas Codes ANSI Z223.1 and/or CAN/CGA
B149 Installation
Codes as well as these installation
instructions.
If the installation
of this GMPN furnace
requires
that an existing appliance
be removed
from a
venting system which still serves another gas fired appliance
this may require that the existing
vent be re-sized.
The following
steps shall be performed
with each appliance
connected
to the
venting system placed in operation
while any other appliance
connected
to the venting system are
not in operation;
a) Seal any unused openings
in the venting system;
b) Inspect the venting
system for proper size and horizontal
pitch, as required in the National
Fuel
Gas Code, ANSI Z223.1 or the CAN/CGA
B149 Installation
Codes and these instructions.
Determine
that there is no blockage
or restriction,
leakage, corrosion
and other deficiencies
which
could cause an unsafe condition;
c) In so far as practical
close all building doors and windows
and all doors between
the space in
which the appliance(s)
connected
to the venting
system are located and other spaces in the
IO-151
19
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