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Inside
Combustible
Wall
Wall Thimble
(Inner Half)
3" Vent
Pipe
Inner Shield
4
1
/
" Dia.
2
Inside
Combustible
Wall
Figure 17. Typical Termination
Flexible gas vent is approved for use in vertical single vent
or common vent installations only. The minimum distance to
combustibles is 1" for type B insulated and 6" for single wall.
The venting system must be installed in accordance with the
local authorities, the vent manufacturer's instructions and the
instructions listed below.
The flexible vent must be installed in accordance with the
venting tables for vertical or common venting only. The vent
system must be supported in horizontal runs with
3/4" pipe strap at a maximum of 5 foot intervals. All horizontal
sections must have a slope toward the furnace of not less
than 1/4" per foot. The vent must not sag, or have any bends
greater than 90 degrees.
Leak Check
After the gas piping to the furnace is complete, all connections
must be tested for gas leaks. To check for leaks use only a
soap and water solution or other approved method.
NOTE: When pressure testing gas supply lines at
pressures greater than 1/2 psig (14 in. water column), the
furnace must be disconnected from the gas supply
piping system to prevent damage to the gas control
valve.
If the test pressure is less than or equal to 1/2 psig (14 in.
water column), the furnace must be isolated from the gas
supply line by closing off the main shut-off valve.
ELECTRICAL WIRING
General
Electrical connections must be made in accordance with all
applicable local codes and ordinances, and with the current
revision of the National Electric Code (ANSI/NFPA 70).
For Canadian installations electrical connections and
grounding must be done in accordance with the current
Canadian Electrical Code (CSA C22.1 Part 1) and/or local
codes. If any of the original wire as supplied with the furnace
must be replaced, it must be replaced with wire having a
minimum temperature rating of 105
nameplate and Table 7 for electrical requirements.
SYSTEM OPERATION INFORMATION
Outer Overlapping
Shield 6
1
/
" Dia.
2
Wall Thimble Outer Half
Locking Band
Protective
Screen
Inner
Overlapping
Shield 6
3
/
" Dia.
8
3" Termination
Tee
12" Min
Outside
Combustible
Wall
o
C. Refer to the furnace
General
Proper maintenance is most important to achieve the best
performance from a furnace. Follow these instructions for
years of safe, trouble free operation.
Do not place combustible material on or against
the furnace cabinet or the vent pipe.
Do not store gasoline or any other flammable
vapors and liquids in the vicinity of the furnace.
Change or replace the air filters monthly during
any period when the circulating blower is operating
regularly.
Always replace the doors on the furnace after
servicing. Do not operate the furnace without all
doors and covers in place.
Avoid operating the furnace when windows and
doors are open.
Be sure that the thermostat is properly installed
and is not being affected by drafts or heat from
lamps or other appliances.
Sequence of Operation
Operating sequences for the heating, cooling, and fan operation
are described below. Refer to the wiring diagrams (Figure 22,
Page 22 & Figure 23, Page 23) and the low voltage field wiring
diagram (Figure 28, Page 25).
Heating Mode:
1. On a call for heat thermostat closes, applying 24 VAC to
the W terminal on the control board.
2. The control board checks for continuity on the 24 VAC
limit control circuit (over-temperature limit switch, flame
roll out switches and blocked vent switch). If an open
limit is detected the control board will energize the
inducer and the conditioned air blower. All other system
functions will be inoperable until the limit circuit closes.
While the limit is open, the red LED will pulse at a rate of
one blink.
3. The furnace control checks for continuity across the
pressure switch (24 VAC). If the pressure switch is
closed the heat mode sequence will not continue. If it
remains closed for 10 seconds the red LED will blink 3
times repetitively until the fault condition clears.
4. The inducer is energized.
5. The pressure switch will close. If the pressure switch
does not close after 10 seconds the fault LED will blink
2 times repetitively and the inducer will continue to run
until the switch is closed.
6. The inducer will pre-purge for 30 seconds and then the
ignitor will start its warm-up. After 30 seconds of ignitor
warm-up the gas valve (24 VAC) will open. The ignitor
circuit stays energized for 6 seconds after the gas valve
opens.
G6RA, G6RK Service Manual 17
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