Reznor VR Unit Installation Manual - Manual (Page 45)

Form I-VR, P/N 205202 R13, Page 44
Is the Pressure
Switch Stuck Open, LED
Fault - 1 FLASH OR
Stuck Closed, LED Fault -
2 FLASHES
?
2 FLASHES
- Is there 24VAC at
COM on pressure
switch?
Is there 24VAC at
N.O. contact on pressure
switch?
Replace pressure swtich. It
is stuck closed if
combustion air blower is
not running.
Is there 24VAC at
PS2 terminal on DSI
control board?
Mis-wired; check
wiring from pressure
swtich to DSI control
board.
Replace DSI
control
board.
Check wire continuity
to pressure switch.
1 FLASH - Is the
combustion air blower
running?
Is there
24VAC at COM contact
on the pressure
switch?
Is there 24VAC at
N.O. contact on pressure
switch?
Is there
24VAC at PS2 on
DSI control board?
Replace DSI
control board.
Check wiring from
pressure switch to
control.
Replace pressure
switch.
Check wiring
continuity to
pressure switch.
Is there correct line
VAC at the combustion air
blower motor?
Replace combustion air
blower motor.
Is there correct
line VAC at IND on DSI
control board?
Check wire continuity
from DSI control board
to combustion air
motor.
Is there
24VAC at "W" on
DSI control board?
Replace DSI control
board.
No call for heat or
check wiring to and
from thermostat.
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
STUCK CLOSED STUCK OPEN
FIGURE 46 -
Pressure Switch
Troubleshooting
Guide
Is the gas
supply turned
on?
Is the gas supply
pressure correct (Refer to
Paragraph 6.3)?
Is the main
electrical supply on?
Is the correct
voltage being supplied.
Rated Acceptable Ranges:
115V - 105 to 130V
208V - 200 to 235V
230V - 210 to 250V
?
Does the
combustion air
blower operate (listen or look
into combustion air
inlet.)?
Is the pressure
switch closing (if the
thermostat is cycled, you should
hear the valve opening and
closing)?
Is the burner
lit (look through
viewport)?
Check the wiring to
the gas valve. If OK,
replace gas valve.
Refer to Ignition
Troubleshooting
Guide, FIGURE 44.
Refer to pressure
switch
Troubleshooting
Guide, FIGURE 46.
Is voltage
present at motor
terminals?
Replace
combustion air
blower motor.
Is voltage present
at IND on the DSI control
board?
Check wire continuity
from DSI control board
to combustion air
blower motor.
Is there 24VAC at
"W" on the DSI control
board?
Replace DSI
control board.
No call for heat or
check wiring to and
from the thermostat.
Correct improper
supply voltage.
Turn on main
electrical supply.
Correct supply prssure by
adjusting field-supplied
pressure regulator or add a
pressure regulator as
appropriate.
Open all manual gas valves
in the supply line to the
heater. Rotate the knob on
the combination valve to
the "ON" position.
YES NO
YES
NO
YES
NO
YES
NO
YES NO
YES
NO
YES
NO
YES
NO
YES
NO
YES NO
FIGURE 45 -
Basic
Troubleshooting
Guide
10.2 Troubleshooting (cont’d)
10. Service (cont’d)