Calibration Check - Honeywell LP916A Service Data

Pneumatic remote bulb thermostats
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CALIBRATION CHECK

Set setpoint knob to temperature measured at bulb location.
Branchline pressure should be 8 ±1 psi (55 ±7 kPa).
CALIBRATION
LP916A & C
Apply 18 psi (124 kPa) main-line pressure.
Measure temperature at sensing bulb location.
Remove setpoint knob using 5/64-in hex wrench to
loosen setscrew.
Rotate setpoint shaft to achieve 8 psi (55 kPa)
branchline pressure. Allow enough time for pressure
build-up.
Replace the knob and position the pointer to
correspond to the temperature sensed by the remote
bulb.
LP916B
For direct action, follow Steps 1 through 5 for LP916A
and C.
For reverse action (except LP916B1058), apply 13 psi
(90 kPa) main-line pressure. For the LP916B1058,
apply 9 psi (62 kPa) main-line pressure.
Adjust switchover lever stop (Fig. 6) to achieve 8 psi
(55 kPa) branchline pressure when the setpoint knob is
set to measured bulb temperature. For the
LP916B1058 model, branchline pressure should be
6 psi (41 kPa).
LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS
SWITCHER
LEVER STOP
SWITCHER
SPRING
ADJUSTING NUT
Fig. 6. LP916B Automatic switchover mechanism.
5
STUD
C8363
75-5559

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