Troubleshooting guide

Power VT
®
Plus WATER HEATER
24
PV500-44 12/13
10.8 LED Display Alarm Messages
Alarm messages are displayed in the upper LED readout and alternate with the default display. An alarm LED ICON
is also illuminated. (See TempTrac User Manual PV500-40 for full description.)
11 REMOTE CONNECTIONS – TERMINAL STRIP
11.1 Making BMS/BAS remote connections for analog and binary (on/off) signals
A terminal strip for the remote connection is located behind the hinged control panel at the top of the cabinet and is
accessed by removing the bottom cover and then removing the screws at the top of the hinged cover.
Important: Do not use single strand bell wire for remote field connections to terminals R1-R2 and C1-C2. Use only
multi-strand copper wire. See table below for wire length and gauge:
WARNING: Turn off all electrical service to the appliance when accessing the remote connections located
inside the control cabinet. These terminals are High Voltage. If the electrical service is not turned off and
these terminals are touched, a dangerous shock causing personal injury or loss of life could occur. Close
and fasten the control cabinet cover before restoring electrical service to the appliance.
ALARM
MESSAGE
CAUSE RESULTS OF ALARM CONDITION
RECOMMENDED
ACTION
“P1” TP1 probe failure
Inlet temperature sensor is not
connected or is reading incorrectly. Call
for heat and burner modulation output
signal will revert to low fire.
Check wiring and sensor
Terminals 14 & 17
“P2” TP2 probe failure
Temperature sensor is not connected
or is reading incorrectly.
Check wiring and sensor
Terminals 15 & 17
“P3” TP3 probe failure
Temperature sensor is not connected
or is reading incorrectly or flue gas
temperature protection is disabled (if
used).
Check wiring and sensor
Terminals 16 & 17
“HA”
High temperature limit
setpoint exceeded
Buzzer sounds, operation continues Manual reset required
“LA” Low temperature alarm Buzzer sounds, operation continues
HP
Digital input 3 is activated
for one or more of the
following:
Flame failure or any control
component failure, if
equipped with alarm on any
failure option
Unit de-energized after timer delay Manually reset required
LP Digital input 2 is activated Unit de-energized after timer delay Manually reset required
Mn1
Maintenance alarm for
output 1
Buzzer sounds, operation continues Check wiring and sensor
Mn2
Maintenance alarm for
output 2
Buzzer sounds, operation continues Check wiring and sensor
Mn3
Maintenance alarm for
output 3
Buzzer sounds, operation continues Check wiring and sensor
“rtc”
The real time clock has lost
its setting
Energy saving function disabled Reprogram clock
Wire Gauge 18 GA 16GA 14 GA 12 GA
Maximum Length 30 FT 50 FT 75 FT 100 FT