Operational Check; Calibration Check - Honeywell LP907A Installation Instructions Manual

ROOM
LP907A
THERMOSTAT
M
B
M
MP516A
OPERATOR
Fig. 5. Typical operation.
TP972
M
B
M
WINTER
18 psi (1.24 BAR)
SUMMER
MP516A
13 psi (.90 BAR)
MP516A
Fig. 6. Typical operation of LP907A in heating-cooling
application (unit ventilator).
D.A.
VP512A
VALVE
C
H
RP418 E-P
RELAY
H L
WIRE IN PARALLEL
WITH FAN MOTOR
FAN
O.A.
R.A.
M5419B
LP907A
D.A.
RP670
FACE AND BY-PASS
RP418 E-P
RELAY
H L
WIRE IN PARALLEL
WITH FAN MOTOR
FAN
O.A.
R.A.
M5448B
LP907A AIRSTREAM INSERTION THERMOSTAT
VP514
Fig. 7. Typical operation of duct mounted LP907A.

Operational Check

LP907A
1. Ensure BLP ahead of the restriction (or MP516B)
equals mainline pressure. If it does not:
a. Adjust the room thermostat in order to obtain equal
pressure.
b. Decrease the air temperature at the device sensing
element or increase the setpoint.
RESULT:BLP to the valve should decrease, and
vice versa.
c. Return setpoint to the original setting.
LP907B, or LP907A with RP670A Switching Relay
1. Supply 13 psi (90 kPa) main air pressure to the LP907B
relay, or 18 psi (124 kPa) main air pressure to the
RP670A, to simulate summer operation.
2. Block BLP to the LP907 to ensure temperature changes
at the sensing element do not affect room thermostat
control of system operation.
3. BLP to the valve should settle to equal thermostat BLP.
NOTE: T he restriction can cause a slight delay in
pressure settling.
4. Supply 18 psi (124 kPa) main air pressure to the relay.
5. Perform the LP907A operational check.

Calibration Check

When BLP equals 8 ± 1 psi (55 ± 7 kPa) with the air
temperature at setpoint, the controller is properly calibrated.
3
M
14002913-002
0.007 IN. RESTRICTION
(NOT FURNISHED)
LP907A
M5450
95-1612EF