A.O. Smith VF VB 1000 Service Handbook page 41

PDB - POWER SUPPLY TEST
The lower right corner of the PDB also contains two jumpers and three power supply status
LED lights. With power applied the green DS2 LED should always be lit. The JP1 jumper is
used to activate a power supply test function. The JP2 and JP3 jumpers are used for
manufacturing purposes only.
Power Test Procedure:
Turn power off to the boiler at the breaker or disconnect switch. Disconnect the wiring plugs
at J1, J2, and J3 Sockets on the PDB. Relocate jumper JP1 from the "Run" pins to the "Test"
pins (see pages 38 and 39). Turn power back on and note which LEDs are illuminated. If the
power supply is properly connected the Yellow and Green LEDs should be illuminated and
the red LED should be off. If any other combination of LEDs are illuminated refer to the table
below for the problem indicated and what corrective action must be taken.
Note:
The JP1 jumper should be in the run position during normal operation. Leaving the jumper in the test mode
when operating the system may cause trouble with Ground Fault Interrupters.
The wire harnesses that normally connect to J1, J2, & J3 should be disconnected while performing this test.
Leaving them connected will not cause damage but the status indicated by the LED's will be incorrect.
LINE CONNECTION STATUS
Proper Connection
Open Ground
Reverse Polarity
Open Hot
Open Neutral
Reverse Hot & Ground
Hot wire on Neutral connect & Open
Neutral wire
AOS WPC - Tech Training
VF BOILER SERVICE MANUAL
D
Servicing should only be performed by a Qualified Service Agent
DS1 YELLOW LED
ON
OFF
OFF
OFF
ON
ON
OFF
JP3 Jumper
Should be on - removed
during manufacturing only
40 of 72
DS2 GREEN LED
ON
ON
ON
OFF
ON
OFF
OFF
DS1
Yellow
Test
JP1
Run
JP1 Jumper
Power Test Jumper
Ashland City, TN © 2007
DS3 RED LED
OFF
OFF
ON
OFF
ON
ON
ON
DS2 DS3
Green Red