Sequence Of Operation; Troubleshooting - Honeywell SmartValve SV9520H Manual

SV9520H SMARTVALVE™ SYSTEM CONTROL LINE VOLTAGE POLARITY SENSE MODELS
.
L2 XFMR
P1
TERMINAL BOARD
4 1
5
2
6
3
24 VAC R W
R W
THERMOSTAT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2 CONNECT THE 120V (HOT) LEAD TO L1 ON TERMINAL BOARD.
APPLIANCE CHASSIS MUST HAVE RELIABLE
3
CONNECTION TO EARTH GROUND.
Fig. 8. SV9520 typical wiring connection with 208907 Terminal Board.

Sequence of Operation

1. Make sure the ignition system control switch is in
the ON position.
2. Follow the sequence of operation as shown in
Fig. 11.

TROUBLESHOOTING

Troubleshooting with LED Indicator
Assistance (no cycling of appliance
power or thermostat call for heat since
appliance failure has occurred)
L2
TO 120 VAC, 60 HZ
POWER SUPPLY
L1
(HOT)
2
40 VA
TRANSFORMER
L1 XFMR
208907
C
R
DATA
C COM
L1
NEUTRAL
ROLL-OUT
SWITCH
1
LIMIT
SWITCH
SV9520
C1
5
6
7
8
C3
3
4
4 3 2
2 1
NEUTRAL
HOT
WARNING
Electrical Shock Hazard.
Can cause property damage, severe
injury or death.
Only a trained, experienced service technician
should perform this troubleshooting.
1. Check the system thermostat to make sure it
is in an active call for heat mode. (Do not cycle
the thermostat on and off at this time.)
2. Remove the appliance burner compartment
door. Do not interrupt the power to the SV9520
by opening any electrically interlocked panels.
3. Observe LED indicator on SV9520; check
and repair the system as noted in Table 9.
4. After LED flash code analysis and appliance
repair are complete, turn thermostat below
room temperature for 10 seconds; turn the
thermostat above room temperature to initiate
a new call for heat.
5. Observe the ignition sequence; comparing it
to the Sequence of Operation shown in Fig. 11.
Allow the new ignition sequence to proceed
until appliance lights or an abnormal or
unexpected event is observed. See next
section.
9
AUXILIARY
LIMIT SWITCH
AIR PROVING
(OPTIONAL)
SWITCH
AIR
1
2
3
4
C2
1
3
FLAME ROD
HOT
SURFACE
IGNITER
COMBUSTION
AIR BLOWER
M17607
69-1383