Honeywell LP916A-C Installation Instructions Manual Download Page 8 | Manualshive

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Honeywell LP916A-C Installation Instructions Manual Download Page 8

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LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

95-5559

95-5559 Rev. 2-90 Printed in U.S.A.

Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 2C9

Home and Building Control
Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis MN 55408-0524

Helping You Control Your World

LP916B Switchover Point Adjustment

A

Back off switchover spring adjusting nut (Fig. 18) until
flush with stud.

B

Calibrate per Steps 1 through 5 of LP916A and C
calibration. Increase branchline pressure by rotating
control shaft clockwise. Allow enough time (up to three
minutes) for branch pressure to build up.

C

Lower main line pressure to 16.5 psi (113 kPa). Tighten
switchover spring adjusting nut until branchline
pressure begins to increase. Allow enough time (up to
three minutes) for branch pressure to build up and
observe WARNING in LP916A and C calibration.

D

Except LP916B1058, lower main line pressure to 13 psi
(90 kPa). Adjust switchover lever stop to 8 psi (55 kPa)
branchline pressure. Increase branchline pressure by
raising lever stop. For LP916B1058, lower mainline
pressure to 9 psi (62 kPa) and adjust switchover lever
stop to 6 psi (41 kPa) branchline pressure.

Fig. 18. LP916B automatic switchover mechanism.

SWITCHOVER
LEVER STOP

SWITCHOVER
SPRING
ADJUSTING NUT

STUD

M7997

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Summary of Contents for LP916A-C

Page 1: ...an 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 This warning is also on a removeable tag Fig 1 attached to the Thermostat and should remain attached until the system is ready to start up Fig 1 LP916 caution label O O L E R W A R M E M B H O N E Y W E L L CAUTION ...

Page 2: ... 14 4 5 8 117 2 3 4 70 3 77 Fig 3 Typical terminal unit mounting locations B Mount Thermostat in location where mounting screws are readily accessible setpoint knob easily reached and scale visible preferably from top of unit through access hatch or from front of unit when front panel is removed C Locate air connections in accessible area If necessary add 1 4 in plastic elbow and or tubing extensi...

Page 3: ...dry tubing Air connections are 1 4 in push on sharp barb type and are labeled M and B for Main and Branch NOTE If air connections are towards back connect appropriate lengths of tubing to barb connectors before mounting Duct Mounting Duct mounting requires a 107324A Duct Bulb Holder Fig 7 The sensing bulb should be located in the duct where air of representative temperature can freely circulate ar...

Page 4: ... wall Mounting Kit Model The LP916 mounting kit model is shown in Figure 12 This model can be either panel mounted or mounted in a terminal unit using a bracket Fig 12 LP916 mounting kit model dimensions in inches millimeters Panel Mounting Mounting LP916 Mounting Kit Model directly on a panel requires a 306016C Bag Assembly which includes a scale plate knob and mounting screws A Drill holes in pa...

Page 5: ...red Bracket Mounting The LP916 Mounting Kit Model is installed in terminal units similar to Figure 5 or 6 using a 306016A or B Bag Assembly These assemblies include a mounting bracket screws nuts clips bulb hangers scale plate and knob The two bag assemblies are similar except for the length of the mounting bracket and the centers of the bracket mounting holes Fig 15 and 16 The two sets of holes i...

Page 6: ...alibration C Hold Thermostat in place in the terminal unit and mark screw hole centers Fig 17 Punch or drill pilot holes in the mounting surface for sheet metal screws Alternately Tinnerman nuts can be used by making clearance holes for the screws D Mount Thermostat in unit E Mount sensing bulb in unit using hangers see Fig 6 Fig 17 Assembling thermostat mounting bracket and scale plate bracket fr...

Page 7: ...B Measure temperature at bulb location C Remove setpoint knob D Rotate control shaft to achieve 8 psi 55 kPa branchline pressure Do not rotate shaft more than two revolutions clockwise from original position as received and allow enough time up to three minutes for branch pressure to build up WARNING Rotating shaft more than two revolutions clockwise from original position can cause permanent dama...

Page 8: ...aft clockwise Allow enough time up to three minutes for branch pressure to build up C Lower main line pressure to 16 5 psi 113 kPa Tighten switchover spring adjusting nut until branchline pressure begins to increase Allow enough time up to three minutes for branch pressure to build up and observe WARNING in LP916A and C calibration D Except LP916B1058 lower main line pressure to 13 psi 90 kPa Adju...

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