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IMPORTANT: ONE OF THE MOST
COMMON CAUSES OF FORCED
AIR HEATING PROBLEMS IS
INSUFFICIENT RETURN AIR TO
THE FURNACE. The return air
system area should be approximately
equal to or greater than the area of
the warm air discharge. CONSULT
LOCAL CODES FOR SPECIAL
REQUIREMENTS. Adjust the blower
speed to maintain the air temperature
rise range shown on the rating plate.
A WARNING: NEVER OPERATE
THE BLOWER OR BURNERS
WITHOUT THE BLOWER DOOR IN
PLACE. DOING SO MAY CAUSE
PRODUCTS OF COMBUSTION TO
CIRCULATE INTO THE LIVING
SPACE CREATING POTENTIALLY
HAZARDOUS CONDITIONS,
INCLUDING CARBON MONOXIDE
POISONING.
NOTE: The outlet duct from the
furnace should have a removable
access panel. It should be accessible
after installation to visually check the
heat exchanger. It also enables a
service person to visually check the
air inlet side of an evaporator coil for
dirt, dust or other obstructions.
A WARNINGS:
1. NEVER ALLOW THE
PRODUCTS OF COMBUSTION
FROM THE FLUE TO ENTER
THE RETURN AIR SYSTEM.
The 18" length of vent pipe
supplied with downflow units
must be securely screwed to the
induced draft blower housing.
The chase enclosing this 18"
length of vent pipe must also be
securely sealed with screws.
2. ALL RETURN AIR DUCTS
MUST BE ADEQUATELY
SEALED AND SECURED TO
THE FURNACE WITH SHEET
METAL SCREWS AND TAPED
JOINTS. SECURE ALL OTHER
DUCT JOINTS WITH
APPROVED CONNECTIONS
AND SEAL AIRTIGHT.
3. WHEN MOUNTING AN
UPFLOW FURNACE ON A
PLATFORM WITH RETURN
THROUGH THE BOTTOM,
SEAL THE FURNACE TO THE
RETURN AIR PLENUM.
4.
THE FLOOR OR PLATFORM
MUST SUPPORT THE
FURNACE WITHOUT SAG-
GING, CRACKS, OR GAPS
AROUND THE BASE, PROVID-
ING A SEAL BETWEEN THE
SUPPORT AND THE BASE.
5.
DO NOT ALLOW PRODUCTS
OF COMBUSTION TO CIRCU-
LATE INTO THE LIVING
SPACE.
6.
DO NOT CONNECT RETURN
OR SUPPLY AIR DUCTS TO
OR FROM ANY OTHER HEAT
PRODUCING APPLIANCE
SUCH
AS A FIREPLACE
INSERT, STOVE, ETC.
FAILURE TO COMPLY WITH
THESE SIX WARNINGS MAY
CAUSE PRODUCTS OF COM-
BUSTION TO CIRCULATE INTO
THE LIVING SPACE CREATING
POTENTIALLY HAZARDOUS
CONDITIONS, INCLUDING
CARBON MONOXIDE POISONING.
UPFLOW UNITS
Construct a bottom return air system
to come up through the floor under
the furnace with a direct connection
made to the bottom of the furnace.
For installations where return air
ducts cannot run under the floor,
connect the return air duct to the side
or rear as required. Side or rear
return air cabinets are available from
the manufacturer.
If side, or rear, air return is used,
determine the opening size required
and mark a line between the
knockout squares. Cut an opening
along these lines.
Where the maximum air flow is 1800
CFM or more, both sides OR the
bottom must be used for return air.
A WARNING: A SOLID METAL
BASE PLATE MUST BE IN PLACE
WHEN THE FURNACE IS
INSTALLED WITH SIDE OR REAR
RETURN AIR DUCTS. FAILURE TO
INSTALL THE BASE PLATE COULD
CAUSE PRODUCTS OF
COMBUSTION TO CIRCULATE
INTO THE LIVING SPACE
CREATING POTENTIALLY
HAZARDOUS CONDITIONS,
INCLUDING CARBON MONOXIDE
POISONING.
NOTE: Install dedicated upflow units
in the upflow position only.
START-UPPROCEDURE
STANDING MODELSPILOT
LIGHTING INSTRUCTIONS
Refer to the instructions on the
furnace for specific controls used with
that unit.
►
These instructions are for
standing pilot
units. If the unit is
equipped with hot surface ignition,
do not attempt to light the furnace
or burners using these instruc-
tions. Refer to the following
instructions for Hot Surface
Ignition Models.
TO START FURNACE
1.
A CAUTION: REMOVE THE
CONTROL ACCESS DOOR. BE
SURE THAT THE MANUAL
GAS CONTROL HAS BEEN IN
THE "OFF" POSITION FOR AT
LEAST FIVE MINUTES. DO
NOT ATTEMPT TO MANUALLY
LIGHT THE MAIN BURNERS.
2. Set the room thermostat to its
lowest setting.
3. HONEYWELL VALVE:
A. Turn the gas control knob to
the pilot position.
B. Push down on the red pilot
button and hold while
manually lighting the pilot
burner.
C. Allow the pilot to burn
approximately one-half minute
before releasing the red pilot
button.
4. ROBERTSHAW VALVE:
A. Move the gas control lever to
the pilot position.
B. Push and hold the gas control
lever in the "SET' position
while manually lighting the
pilot burner.
C. Allow pilot to burn approxi-
mately one-half minute before
releasing the lever to the pilot
position.
5.
Turn the gas control knob or
lever to the "ON" position.
6. Replace the control access door.
7. Set the room thermostat to a
point above the room
temperature to light the main
burners. After the main burners
are lit, set the room thermostat to
a desired temperature.
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