34
O
O
O
O
O
P E R
P E R
P E R
P E R
P E RA
A
A
A
AT I O N A L
T I O N A L
T I O N A L
T I O N A L
T I O N A L
C
C
C
C
C
H E C K
H E C K
H E C K
H E C K
H E C KS
S
S
S
S
& S
& S
& S
& S
& S
A F E T
A F E T
A F E T
A F E T
A F E TY
Y
Y
Y
Y
C
C
C
C
C
I R
I R
I R
I R
I RC U I T
C U I T
C U I T
C U I T
C U I T
D
D
D
D
D
E S
E S
E S
E S
E SC R I P
C R I P
C R I P
C R I P
C R I PT I O N
T I O N
T I O N
T I O N
T I O N
F
FF
F
F
AN
AN
AN
AN
AN
O
O
O
O
O
NLY
NLY
NLY
NLY
NLY
M
M
M
M
M
ODE
ODE
ODE
ODE
ODE
The normal operational sequence in fan only mode is as follows:
•
R and G thermostat contacts close, initiating a call for fan.
•
Integrated control module performs safety circuit checks.
•
Circulator blower is energized on continuous fan speed (30%
of the furnace’s maximum airflow capability) following a
five (5) second delay. Electronic air cleaner terminal is
energized.
•
Circulator blower runs, integrated control module monitors
safety circuits continuously.
•
R and G thermostat contacts open, completing the call for
fan.
•
Circulator blower is de-energized. Electronic air cleaner
terminal is de-energized.
•
Furnace awaits next call from thermostat.
O
O
O
O
O
P E R
P E R
P E R
P E R
P E RA
A
A
A
ATIONAL
TIONAL
TIONAL
TIONAL
TIONAL
C
C
C
C
C
H E C K
H E C K
H E C K
H E C K
H E C KS
S
S
S
S
The burner flames should be inspected with the burner compart-
ment door installed. Flames should be stable, quiet, soft, and blue
(dust may cause orange tips but they must not be yellow). Flames
should extend directly outward from the burners without curling,
floating, or lifting off. Flames must not impinge on the sides of the
heat exchanger firing tubes.
Burner Flame
S
SS
S
S
AFETY
AFETY
AFETY
AFETY
AFETY
C
C
C
C
C
IRCUIT
IRCUIT
IRCUIT
IRCUIT
IRCUIT
D
D
D
D
D
ESCRIPTION
ESCRIPTION
ESCRIPTION
ESCRIPTION
ESCRIPTION
A number of safety circuits are employed to ensure safe and proper
furnace operation. These circuits serve to control any potential
safety hazards and serve as inputs in the monitoring and diagnosis
of abnormal function. These circuits are continuously monitored
during furnace operation by the integrated control module.
IIIII
NTEGRATED
NTEGRATED
NTEGRATED
NTEGRATED
NTEGRATED
C
C
C
C
C
ONTROL
ONTROL
ONTROL
ONTROL
ONTROL
M
M
M
M
M
ODULE
ODULE
ODULE
ODULE
ODULE
The integrated control module is an electronic device which, if a
potential safety concern is detected, will take the necessary pre-
cautions and provide diagnostic information through an LED.
P
P
P
P
P
RIMARY
RIMARY
RIMARY
RIMARY
RIMARY
L
L
L
L
L
IMIT
IMIT
IMIT
IMIT
IMIT
The primary limit control is located on the partition panel and moni-
tors heat exchanger compartment temperatures. It is a normally-
closed (electrically), automatic reset, temperature-activated sen-
sor. The limit guards against overheating as a result of insufficient
conditioned air passing over the heat exchanger.
A
A
A
A
A
UXILIARY
UXILIARY
UXILIARY
UXILIARY
UXILIARY
L
L
L
L
L
IMIT
IMIT
IMIT
IMIT
IMIT
The auxiliary limit controls are located on or near the circulator
blower and monitors blower compartment temperatures. They are
a normally-closed (electrically), auto-reset sensors. These limits
guard against overheating as a result of insufficient conditioned air
passing over the heat exchanger.
R
R
R
R
R
OLLOUT
OLLOUT
OLLOUT
OLLOUT
OLLOUT
L
L
L
L
L
IMIT
IMIT
IMIT
IMIT
IMIT
The rollout limit controls are mounted on the burner/manifold as-
sembly and monitor the burner flame. They are normally-closed
(electrically), manual-reset sensors. These limits guard against burner
flames not being properly drawn into the heat exchanger.
P
P
P
P
P
RESSURE
RESSURE
RESSURE
RESSURE
RESSURE
S
S
S
S
S
WITCHES
WITCHES
WITCHES
WITCHES
WITCHES
The pressure switches are normally-open (closed during operation)
negative air pressure-activated switches. They monitor the airflow
(combustion air and flue products) through the heat exchanger via
pressure taps located on the induced draft blower and the coil front
cover. These switches guard against insufficient airflow (combus-
tion air and flue products) through the heat exchanger and/or blocked
condensate drain conditions.
F
FF
F
F
LAME
LAME
LAME
LAME
LAME
S
S
S
S
S
ENSOR
ENSOR
ENSOR
ENSOR
ENSOR
The flame sensor is a probe mounted to the burner/manifold as-
sembly which uses the principle of flame rectification to determine
the presence or absence of flame.
T
T
T
T
T
ROUBLESHOOTING
ROUBLESHOOTING
ROUBLESHOOTING
ROUBLESHOOTING
ROUBLESHOOTING
E
EE
E
E
LECTROSTATIC
LECTROSTATIC
LECTROSTATIC
LECTROSTATIC
LECTROSTATIC
D
D
D
D
D
ISCHARGE
ISCHARGE
ISCHARGE
ISCHARGE
ISCHARGE
(ESD) P
(ESD) P
(ESD) P
(ESD) P
(ESD) P
RECAUTIONS
RECAUTIONS
RECAUTIONS
RECAUTIONS
RECAUTIONS
NO
NO
NO
NO
NOTE:
TE:
TE:
TE:
TE: Discharge body’s static electricity before touching unit. An
electrostatic discharge can adversely affect electrical components.
Use the following precautions during furnace installation and ser-
vicing to protect the integrated control module from damage. By
putting the furnace, the control, and the person at the same elec-
trostatic potential, these steps will help avoid exposing the inte-
grated control module to electrostatic discharge. This procedure is
applicable to both installed and uninstalled (ungrounded) furnaces.
1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic charge
to ground.
2. Firmly touch a clean, unpainted, metal surface of the furnace
away from the control. Any tools held in a person’s hand
during grounding will be discharged.
3. Service integrated control module or connecting wiring
following the discharge process in step 2. Use caution not
to recharge your body with static electricity; (i.e., do not
move or shuffle your feet, do not touch ungrounded objects,
etc.). If you come in contact with an ungrounded object,
repeat step 2 before touching control or wires.
4. Discharge your body to ground before removing a new
control from its container. Follow steps 1 through 3 if
installing the control on a furnace. Return any old or new
Содержание GDVC80703B
Страница 46: ...46 THIS PAGE LEFT BLANK INTENTIONALLY...
Страница 47: ...47 THIS PAGE LEFT BLANK INTENTIONALLY...