Honeywell LP916A, LP916B, LP916C Installation Instructions

LP916A, B and C Pneumatic

Remote Bulb Thermostats

INSTALLATION INSTRUCTIONS

BEFORE INSTALLATION

The LP916A, B and C Pneumatic Remote Bulb Thermostats provide proportional control of heating or cooling in induction units, fan coil units and unit ventilators. A wide throttling range model is available for duct discharge control of heating or cooling coils and mixed air dampers.

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.

The caution is also on a removable tag attached to the thermostat and should remain attached until the system is ready to start up. See Fig. 1.

B					M
N	O	R	M	A
					L
R					C
E					O
M
					O
R
CAUTION

DO NOT

ROTATE SETPOINT SHAFT MORE THAN TWO COMPLETE CLOCKWISE REVOLUTIONS FROM ITS 'AS RECEIVED' CONDITION - THE DEVICE MAY BE PERMANENTLY DAMAGED

C4646

Fig. 1. The LP916 caution label removable tag.

Use care to prevent the capillary and sensing bulb from being dented or damaged during installation. Avoid any sharp bends or kinks in the capillary.

® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved	95-5559EF

INSTALLATION

Integral Mounting Bracket Model

The LP916 integral mounting bracket model includes two Tinnerman nuts, two sensing bulb hangers and two No. 10 x 5/8 in. sheet metal screws. See Fig. 2 for dimensions.

				3/8 (10)	9/16 (14)
B				M
N	O	R M	A
R			L
				C
E				O
M				O
R
				L
A				E
					4-5/8
					(117)
H O N E Y W E L L
2-3/4 (70)					3 (77)
					C4647

Fig. 2. Dimensions of the LP916 integral mounting bracket in in. (mm).

The integral mounting bracket model allows the thermostat to be mounted in a terminal unit or on a duct.

Terminal Unit Mounting

Mounting Considerations

1.Install the return air thermostat in one of the end compartments or pockets of the unit. See Fig. 3. Any of the positions, points A, B, C or D, are acceptable.

	A	B
	D	C
		E
		M18340

Fig. 3. Typical terminal unit mounting locations.

2.Mount the thermostat in the location where the mounting screws are readily accessible and the setpoint knob easily reached. Preferably the scale is visible from the top of unit through the access hatch or from the front of the unit when the front panel is removed.

3.Locate air connections in accessible area. If necessary, add 1/4-in. plastic elbow and/or tubing extensions to barb connectors before installation.

4.Mount the bulb at either of the E points. See Fig. 3. Avoid kinks, dents or sharp bends in the 36 in. (914 mm) capillary.

NOTE: Mount so that capillary does not rub on sharp corners.

5.Locate the plastic tubes away from the hot supply lines.

Mounting Procedures

1.Hold the thermostat in place and mark screw hole centers. See Fig. 4. Punch or drill the pilot holes for the sheet metal screws.

NOTE: Tinnerman nuts can be used by making clearance holes for the screws.

MOUNTING			MOUNTING
			FLANGE
FLANGE
	2 ±1/4
2 ±1/4	(51±6)	2	±1/4
(51±6)		(51±6)

M18341

Fig. 4. Alternate locations for mounting screws. Dimensions are in in. (mm).

2.Mount the thermostat. See Fig. 5 or 6.

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2

NOTE: When air connections are towards the back, connect the appropriate lengths of tubing to the barb connectors before mounting.

Duct Mounting

Duct mounting requires a 107324A duct bulb holder. See Fig. 7. The sensing bulb should be located in the duct where air of representative temperature can freely circulate.

IMPORTANT

Do not mount the bulb close to hot pipes, cooling coils and other places where the air temperature is not representative.

M18346

Fig. 5. Terminal unit top view with the thermostat mounted in the preferred position.

3.Carefully uncoil and extend the capillary tubing.

4.Use the existing knockout and insert the sensing bulb with the capillary through the hole. Locate the bulb between the return air filter and the coil. Bush hole in the unit wall to protect the capillary tubing.

NOTE:

√When the existing knockout is not convenient, make a 5/8-in. (16 mm) hole in the unit wall between the end compartment, filter and the coil compartment.

√Do not locate the sensing bulb where it can be affected by any outdoor airflow such as a unit that uses a fixed-percentage outdoor air damper.

5.Clip the two bulb hangers to the drain pan or edge of the frame member. See Fig. 6. Tap the top end to ensure firm mounting.

C7866

Fig. 7. The 107324A duct bulb holder.

1.Cut a 3/4-in. (19 mm) diameter hole in the duct wall to admit the sensing bulb and bulb holder.

2.Mount the thermostat near the hole in the duct.

NOTE: Mount on top of the duct or on a bracket or angle iron, obtained locally.

3.Using the bulb holder as a template, mark and drill holes for the bulb holder and mounting screws.

4.Shorten the bulb holder to the desired length. See Fig. 8.

NOTE: The bulb holder should be long enough to hold the sensing bulb in the freely circulating air away from the duct wall. Neatly coil any excess capillary tubing at the thermostat case or the bulb holder.

SENSING ELEMENT

AND HANGERS

M18347

Fig. 6. Alternate mounting of the thermostat at the bottom front of the end compartment.

6.Snap the sensing bulb into position.

7.Before connecting the air, leave main line disconnected for about one minute to clear and dry the tubing. Air connections are a 1/4-in. push-on sharp-barb type with the labels M (Main) and B (Branch).

M18342

Fig. 8. Shortening the bulb holder.

5.Place the capillary tubing in the bulb holder channel and pinch the top edges of the holder together at each segment. See Fig. 9.

3

95-5559EF

CAPILLARY

BE SURE THIS TUBE IS UNDER

BULB HOLDER, AS SHOWN

M18343

Fig. 9. Mounting the capillary tubing in the bulb holder.

6.Insert the bulb and bulb holder into the duct through the hole prepared in Step 1. See Fig. 10.

CONTROLLED	SCREW
AREA	HOLES IN
	DUCT WALL

BULB

BULB

HOLDER

DUCT

M18344

Fig. 10. Inserting the bulb and bulb holder into the duct.

7.Use screws to fasten the bulb holder to the duct wall. See Fig. 11.

M18345

Fig. 11. Fastening the bulb holder to the duct wall.

Mounting Kit Model

The LP916 mounting kit model is shown in Fig. 12. This model can be either panel mounted or mounted in a terminal unit using a bracket.

B

M

+	+
+
		4-7/8
		(124)
+	+	4-1/2
		(115)
+	+
2-3/16 (56)		2-1/16 (53)
		C4653

Fig. 12. Dimensions of the LP916 mounting kit in in. (mm).

Panel Mounting

Mounting the LP916 mounting kit model directly on a panel requires a 306016C bag assembly. The kit includes a scale plate, knob and mounting screws.

1.Drill holes in the panel on the centers. See Fig. 13.

7/32 (6) DIA -2

1-1/8

(29)

2-1/4

(57)

PANEL

3/8 (10) DIA

C4650

Fig. 13. Hole dimensions in in. (mm) for the

LP916 mounting kit.

CAUTION

Equipment Damage Hazard.

Be careful not to change position of control shaft when removing shipping stop and attaching the setpoint knob and scale plate to the thermostat.

2.Mount the thermostat from the rear of the panel and secure on the front with the scale plate and screws. See Fig. 14.

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4

CAPILLARY

MAIN

BRANCH

PROTECTED BARBS

THERMOSTAT

CONTROL SHAFT

SCALEPLATE

10-32 x 1/4-IN. SCREW (2)

	SETPOINT
	KNOB
SENSING
BULB	C4652

Fig. 14. Installing the setpoint knob and scale plate.

3.Place the setpoint knob on the control shaft with the pointer aligned over the mid-mark on the scale plate. See Fig. 14. Secure the knob firmly with the set screw to maintain the calibration.

4.Mount the sensing bulb in the unit.

Bracket Mounting

The LP916 mounting kit model uses a 316016A or B bag assembly when installed in terminal units similar to Fig. 5 or 6. 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. See Fig. 15 and 16. The two sets of holes in the mounting brackets allow the thermostat to be mounted either vertically or horizontally.

5

3-1/4

(83)

5/8

(16)

1-7/8 (48)

2-3/4 (70)

C4648

Fig. 15. Mounting bracket in 316016A bag assembly. Dimensions are in in. (mm).

5-5/16

(135)

5/8

(16)

2 (51)

2-3/4 (70)

C4649

Fig. 16. Dimensions of the mounting bracket in the 316016B bag assembly in in. (mm).

CAUTION

Equipment Damage Hazard.

Be careful not to change position of control shaft when removing the shipping stop and attaching the setpoint knob and scale plate to the thermostat.

1.Assemble the thermostat, mounting bracket and scale plate. See Fig. 17.

2.Place the setpoint knob on the control shaft with the pointer aligned over the mid-mark on the scale plate.

3.Secure the knob firmly with the setscrew to maintain calibration.

95-5559EF