Troubleshooting - Honeywell LP916A Service Data

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

TROUBLESHOOTING

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