Bradford White RG1PV40SN19 Service Manual page 20

PV Series
Step 15.
To resume operation, follow the instructions located on the lighting
instruction label or the lighting instructions located in the installation and
operation manual.
Pressure Switch Testing
Step 1.
Position power switch on gas
control to the "OFF" position.
Step 2.
Remove the three screws (T20 Torx driver) from control access cover on
blower assembly and remove cover (see photo 1).
Step 3.
Carefully remove pressure switch from blower housing (see photo 2).
With steps 1,2 &3
complete, disconnect
wire leads from
pressure switch
Use a multi-meter set to the ohms
setting. With blower off, check
across pressure switch terminals.
Are switch contacts open?
(no electrical continuity)
Y
Position gas valve power switch to
the "ON" position and adjust
thermostat to call for heat, this will
start the blower. Check with
multi-meter, do pressure switch
contacts close with blower running?
Y
Switch contacts are OK.
See safety circuit trace.
(page 36)
20
Check tubing and pressure tap on
N
Y
N
Check tubing and pressure
tap on switch for blockage.
Is there blockage?
WARNING
115-volt potential exposure. Use
caution to avoid personal injury.
1
PRESSURE SWITCH
WIRE LEADS
N
switch for blockage.
Is there blockage?
Y
Clear blockage
Y
N
Is vent system N
blocked?
20
2
Slide pressure switch in direction
Of arrow while tilting slightly away
from blower housing.
Replace switch
Is vent system length within
Y
vent table specifications
N
Reconfigure vent
system to be
compliant with
vent tables
Y
See blower testing
(page 22)
Is blower OK?
N
Correct Blower
problem