Honeywell LP916A Instructions D'installation page 7

DISCHARGE AIR
LP916B
M B
SUM/WIN
M
FILTER
RETURN AIR
Fig. 20. Typical LP916B fan coil application, heating and
cooling with seasonal changeover.
DISCHARGE AIR
LP916C
M B
M
FILTER
RETURN AIR
Fig. 21. Typical cooling only LP916C fan coil application.
COIL
N.O.
CW IN
SUMMER
BULB HW IN
WINTER
FAN
M5416
COIL
N.O.
CHILLED
WATER
SUPPLY
BULB
FAN
M5415
CHECKOUT AND TESTING
CAUTION
Equipment Damage Hazard.
Do not rotate the thermostat control shaft more
than two revolutions clockwise from the original
position as received. Rotating the shaft more than
two revolutions from the original position can
cause permanent damage to the thermostat.
Using a CCT729A Gage Adaptor, insert a 0 to 30 psi (0 to
207 kPa) gage into the gage plug on the front of the
thermostat. Turn the setpoint knob above and below the bulb
ambient temperature. If the branchline pressure can be varied
from 0 psi (0 kPa) to full main pressure within the rated
throttling range, the thermostat is operating properly. If not,
recalibrate (see the CALIBRATION section).
NOTE: Allow enough time (up to three minutes) for the
branch pressure to build up.
See Table 1 for the throttling range and scale increment
values for various thermostat models.
Table 1. Throttling Ranges and Scale Increment Values.
Setpoint
Range in F
(C)
WARMER-COOLER/0.9F
1
65-85 (18-29)
40-80 (4-27)
60-80 (16-27)
1
The LP916B1058 WARMER-COOLER model has a throt-
tling range of 2F (1K) when on reverse-acting (9 psi supply
pressure).
CALIBRATION
The thermostat is factory calibrated at midscale (pointer
vertical) and normally requires no adjustment. Warmer-Cooler
models are calibrated at 75F.
IMPORTANT
If recalibration is required, always allow enough
time (up to three minutes) for the branch pressure to
stabilize.
LP916A and C Calibration
1. Apply 18 psi (124 kPa) main line pressure.
2. Measure the temperature at the bulb location.
3. Remove the setpoint knob.
4. Rotate the control shaft to achieve 8 psi (55 kPa)
branchline pressure.
7
Scale Increments Degrees F (K)
40-50-60-70-80
60-80/1F
Throttling
Range in
3.5 (2)
7 (3.5)
3.5 (2)
95-5559EF