Submittal Sheet

6
LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS
75-5559
TROUBLESHOOTING
Before troubleshooting the LP916, check branchline piping
and actuators for leaks.
Refer to Figure 7 to troubleshoot the LP916 Thermostat.
Fig. 7. LP916 Troubleshooting flowchart.
CHECK
CALIBRATION
CHECK MAIN
AIR
PRESSURE
DISCONNECT
BRANCH LINE AT
CONTROLLER
AND PLUG
OUTLET
CONTROLLER OK.
CHECK PIPING AND
ACTUATOR FOR
LEAKS
REPLACE
CONTROLLER
PRESSURE
BLEEDS OFF
WHEN SETPOINT
IS MOVED IN
OPPOSITE
DIRECTION?
PRESSURE
BUILDS UP
SMOOTHLY
WHEN SETPOINT
IS CHANGED?
CORRECT
PRESSURE
FOR SEASON
OR
APPLICATION?
OPERATES
PROPERLY
?
BEGIN
MAKE
OPERATIONAL
CHECK
PRESSURE
BUILDS UP
PROPERLY?
TROUBLESHOOT
AIR SUPPLY
YES
YES NO
YES
NO
NO
NO
YES
NO YES
RECALIBRATE
CALIBRATION
OK?
NO
YES
REPLACE FILTERS AND
RESTRICTION PLATE
C2860