Honeywell LP916A Mounting instructions

LP916A-C Pneumatic

Remote Bulb Thermostats

75-5559

SERVICE DATA

GENERAL

DESCRIPTION

The LP916 Thermostats are bleed-type controllers with a

fixed throttling range. They have a liquid-filled, remote

thermal element.

APPLICATION

Typical applications for the LP916A are duct-mounted (Fig. 1)

and mixed air control (Fig. 2). The LP916B is typically used

for fan coil unit control (Fig. 3). Typical applications for the

reverse acting LP916C are cooling coil control similar to

Figure 1 or fan coil control (Fig. 4).

Fig. 1.Typical LP916A duct-mounted heating application.

Fig. 2.Typical LP916A mixed air application.

Fig. 3.Typical LP916B fan coil application, heating/

cooling with seasonal changeover.

S5785-2

S5783-1

S3803-1

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

75-5559

Fig. 4.Typical LP916C fan coil application, cooling only.

SPECIFICATIONS

Models:

LP916A: Direct Acting.

LP916B: Reverse acting at 9 or 13 psi (62 or 90 kPa)

supply pressure (Summer), direct acting at 18 psi

(124 kPa) supply pressure (Winter).

LP916C: Reverse Acting.

Maximum Safe Air Pressure:

25 psi (172 kPa).

Maximum Safe Temperature:

Duct-mounted models 190F (88C); all others 135F (57C).

Nominal Main-Line Pressure:

LP916A & C: 18 psi (124 kPa).

LP916B: 18 psi (124 kPa) heating, 9 or 13 psi (62 or

90 kPa) Cooling.

For other LP916 specifications refer to Table 1.

S22642

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

375-5559

Table 1. LP916 Specifications.

Model Setpoint

Range F/C Throttling

Range F/C Restrication

Size In. Bulb Size

Inches

Inactive or obsolete.

Mounting

Bracket

0.007

1LP916A1001 65-85F 3.5F 3/8 x 9 Separate

LP916A1019 65-85F or 19-30C 3.5F or 2C 0.007 1/2 x 5 Integral

55-95F 7.0F 0.007 3/8 x 6-11/16LP916A1035 1 Integral

1LP916A1027 65-85F 3.5F 0.007 3/8 x 9 Integral

LP916A1050 17-27C 1.95C 0.007 1/2 x 5 Integral

17-27C 1.95C 0.007 3/8 x 9LP916A1068 Integral

13-35C 3.89C 0.007 3/8 x 6-11/16LP916A1076 Integral

17-27C 1.95C 0.007 3/8 x 9LP916A1084 Integral

35-115F 0.007 3/8 x 3-1/214.0F

LP916A1100 Integral

55-95F 0.007 3/8 x 77.0FLP916A1118 Integral

3.5F or 2C65-85F or 19-30CLP916A1134 0.005 3/8 x 9 Integral

55-95F 7.0F 0.005 3/8 x 6-11/16LP916A1142 Integral

17-27C 1.95C 0.005 3/8 x 9LP916A1159 Integral

LP916A1175 0.007 3/8 x 77.0F or 4C40-80F or 4-27C Integral

3.5F or 2C65-85F or 19-30CLP916B1017 0.007 1/2 x 5 Integral

65-85F 3.5F 0.007 3/8 x 9LP916B1025 Integral

17-27C 1.95C 0.007 3/8 x 9LP916B1041 Integral

3.5F or 2C65-85F or 19-30CLP916B1058 0.007 1/2 x 5 Integral

65-85F 3.5F 0.007 3/8 x 9LP916B1066 Integral

3.5F or 2C65-85F or 19-30CLP916B1082 0.005 1/2 x 5 Integral

17-27C 1.95C 0.005 3/8 x 9LP916B1090 Integral

3.5F or 2C65-85F or 19-30CLP916B1108 0.005 3/8 x 9 Integral

65-85F 3.5F 0.007 3/8 x 9LP916C1007 Integral

17-27C 1.95C 0.007 3/8 x 9LP916C1015 Integral

LP916C1023 60-80F or 16-27C 3.5F or 2C 0.007 3/8 x 9 Integral

3.5F or 2C65-85F or 19-30C 0.007 1/2 x 5LP916C1049 Integral

35-115F 0.007 3/8 x 3-1/214.0FLP916C1072 Integral

55-95F 0.007 3/8 x 77.0FLP916C1080 Integral

3.5F or 2C65-85F or 19-30CLP916C1098 0.005 3/8 x 9 Integral

40-80F or 4-27C 0.007 3/8 x 77.0F or 4CLP916C1114 Integral

17-27C 3.80C 0.007 3/8 x 6-11/16LP916A1092 Separate

65-85F or 19-30C 3.5F or 2CLP916A1126 0.005 3/8 x 9 Separate

0.007 3/8 x 93.5F65-85FLP916B1009 Separate

3.5F or 2C65-85F or 19-30CLP916B1074 0.005 3/8 x 9 Separate

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

75-5559

OPERATION

LP916A (Direct Acting)

When temperature at the sensing element falls below setpoint

of the LP916A, branchline pressure to the normally open

(n.o.) valve is lowered, and the valve is modulated open to

maintain setpoint temperature.

LP916B (Reverse/Direct Acting)

With main-line pressure at 13 psi (90 kPa) for all except

LP916B1058 which requires 9 psi (62 kPa), the LP916B

operates reverse acting. As the sensed temperature

increases, the branchline pressure decreases and chilled

water flow increases with a n.o. valve.

With a high main-line pressure of 18 psi (124 kPa) or above,

the LP916B operates direct acting. As the sensed

temperature increases, the branchline pressure increases

and hot water flow decreases with a n.o. valve.

LP916C (Reverse Acting)

When the LP916C is used with a normally open valve for

cooling, branchline pressure drops with a rise in sensed air

temperature and the n.o. valve is modulated open to maintain

setpoint temperature.

MAINTENANCE

EQUIPMENT REQUIRED

— Commercial Cleaning Solvent or Degreaser.

— Gage Adaptor CCT729A.

— Gage 305965, 0 to 30 psi.

— 5/64-inch Hex wrench.

WARNING

Careless handling of solvents can result in permanent

damage to the respiratory system or skin. Avoid

prolonged inhalation of vapors or contact with skin.

CLEANING

Remove cover. Use cleaning solvent to clean all surfaces.

Clean the element and capillary tubing, making certain

neither is damaged or kinked. Do not bend the capillary

tubing in a short radius.

OPERATIONAL CHECK

Use gage adaptor. Insert the gage into the gage tap (Fig. 5)

on the front of the device. Set main-line pressure to 18 psi

(124 kPa), or 13 psi (90 kPa) for LP916B Summer

application. Slowly turn the setpoint knob above and below

bulb ambient temperature. The branchline pressure should

vary from 3 to 13 psi (21 to 90 kPa) pressure, or 13 to 3 psi

(90 to 21 kPa) for reverse acting application within the rated

throttling range. If operation is not satisfactory, recalibrate and

recheck (see CALIBRATION). Turning the knob to above 13

psi (90 kPa) should build branch line to within 2 psi (14 kPa)

of main.

Fig. 5. LP916 Gage tap location.

GAGE TAP

C2861

COOLER

NORMAL

WARMER

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

575-5559

CALIBRATION CHECK

Set setpoint knob to temperature measured at bulb location.

Branchline pressure should be 8 ±1 psi (55 ±7 kPa).

CALIBRATION

LP916A & C

AApply 18 psi (124 kPa) main-line pressure.

BMeasure temperature at sensing bulb location.

CRemove setpoint knob using 5/64-in hex wrench to

loosen setscrew.

DRotate setpoint shaft to achieve 8 psi (55 kPa)

branchline pressure. Allow enough time for pressure

build-up.

EReplace the knob and position the pointer to

correspond to the temperature sensed by the remote

bulb.

LP916B

AFor direct action, follow Steps 1 through 5 for LP916A

and C.

BFor reverse action (except LP916B1058), apply 13 psi

(90 kPa) main-line pressure. For the LP916B1058,

apply 9 psi (62 kPa) main-line pressure.

CAdjust 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).

Fig. 6. LP916B Automatic switchover mechanism.

SWITCHER

LEVER STOP

SWITCHER

SPRING

ADJUSTING NUT STUD C8363

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

75-5559

TROUBLESHOOTING

Before troubleshooting the LP916, check branchline piping

and actuators for leaks.

Refer to Figure 7 to troubleshoot the LP916 Thermostat.

Fig. 7. LP916Troubleshooting flowchart.

CHECK

CALIBRATION

CHECK MAIN

AIR

PRESSURE

DISCONNECT

BRANCH LINE AT

CONTROLLER

AND PLUG

OUTLET

CONTROLLER OK.

CHECK PIPING AND

ACTUATOR FOR

LEAKS

REPLACE

CONTROLLER

PRESSURE

BLEEDS OFF

WHEN SETPOINT

IS MOVED IN

OPPOSITE

DIRECTION?

PRESSURE

BUILDS UP

SMOOTHLY

WHEN SETPOINT

IS CHANGED?

CORRECT

PRESSURE

FOR SEASON

APPLICATION?

OPERATES

PROPERLY

BEGIN

MAKE

OPERATIONAL

CHECK

PRESSURE

BUILDS UP

PROPERLY?

TROUBLESHOOT

AIR SUPPLY

YES

YES NO

YES

NO YES

RECALIBRATE

CALIBRATION

OK?

YES

REPLACE FILTERS AND

RESTRICTION PLATE

C2860

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

775-5559

REPAIR

The only repair recommended for the LP916 is the

replacement of the plate and tube assembly, gaskets,

restriction plate, and filters with connector assembly and

gasket. Since February 1984, models have a different

connector assembly with a single gasket, these are included

in Repair Kit 14003113-002, as shown in Figure 8. All

available parts are listed in the PARTS AND ACCESSORIES

section.

EQUIPMENT REQUIRED

Gulmite Head Screw Wrench 316744-00021.

14003113-002 REPAIR KIT INSTALLATION

ATurn off system air and remove LP916 from system.

BRemove and save the three No. 8-32 x 7/16-in. pan

head screws from the connector assembly (Fig. 8) or

plate and tube assembly (Fig. 9 or 10).

CLift off the connector assembly and gasket or plate and

tube assembly, restriction gasket, restriction plate, body

gasket, and two filters and discard.

DPlace new gasket on body and align screw holes.

EPosition the new connector assembly on gasket and

align screw holes. A 0.007 in. restriction may be used

for models with a 0.005 in. restriction with no effect on

operation except a slightly higher air consumption. If air

consumption is a problem, connector assembly with a

0.005 in. restriction may be ordered and substituted.

FInsert and tighten the three screws.

GMake operational check (See OPERATIONAL CHECK).

NOTE: For 14003113-001 Repair Kit follow directions on

package.

Fig. 8. Repair kit 14003113-002 (0.007 in. restriction

included in kit).

INDICATES 0.005 IN. RESTRICTION

INDICATES 0.007 IN. RESTRICTION

CONNECTOR

ASSEMBLY

GASKET

C8362

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

75-5559

PARTS AND ACCESSORIES

PARTS LIST

See Figure 9 for LP916A &C exploded view and Figure 10 for

LP916B exploded view. See Tables 2 and 3 for LP916A &C

parts list and Tables 3 and 4 for LP916B parts list.

Table 2. LP916A and C Parts list (Fig. 9).

Key Part No. Description

316294

—

14003113-001

—

14004378-001

14004378-002

14004376-001

14003113-002

—

316372A

316372B

316372C

—

Cover

6-32 x 3/16 in. rd-hd slotted screw

6-32 x 1/4 in. pan-hd slotted screw with washer (2)

Spring

Plate

6-32 x 0.31 (5/16) in. rd-hd slotted screw with washer (2)

Base

Baseplate

Scaleplate

8-32 x 5/16 in. slotted pan-hd screw (7)

Palnut

Setpoint Shaft

Knob (includes 8-32 x 5/16 in. hex socket setscrew). Use 5/64 in. key to tighten.

Repair Kit—Consists of Filters, Body Gasket, 0.007 Restriction, and Restriction Gasket

Filters (2)

BodyGasket

0.007 Restriction Plate

Restriction Gasket

Plate and Tube Assembly

8-32 x 7/16 in. pan-hd slotted screw (3)

Connector Assembly (0.007)

Connector Assembly (0.005)

Gasket

Repair Kit—Consists of 14004378-001 Connector Assm. (0.007) & 14004376-001 Gasket

Nozzle

Flapper

Spring

4-40 x 3/16 rd-hd slotted screw

Element and Lever Assembly (see Table 3)

Lever (LP916A)

Lever (LP916C)

Spring

8-32 x 5/16 in. pan-hd slotted screw with star lockwasher

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

975-5559

Fig. 9. LP916A and C Exploded view (SeeTables 2 and 3).

S22649

LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS

75-5559

Table 3. LP916A-C Element and lever assemblies.

Table 4. LP916B Parts list (Fig. 10).

Assembly

Part No. Part No. Bulb Size in. (mm)

316372A A1001, A1027, A1068, B1009,

B1025, B1041, B1066, C1007,

C1023

3/8 x 9-1/2

(9.5 x 241)

316372B A1019, B1017, B1058, C1049 1/2 x 5-3/4

(13 x 146)

316372Ç A1035, A1076, A1118, A1126,

A1134, A1142, A1159, A1175,

B1074, B1082, B1090, B1108,

C1080, C1098, C1114

3/8 x 6-3/4

(10 x 172)

Key Part No. Description

15|

316294

—

316372A

316372B

316372C

—

316732

14003113-001

—

14004378-001

14004378-002

14004376-001

14003113-002

—

Cover

Nut

Lever

Element and Lever Assembly (see Table 3)

Stud

Spring

Lever

4-48 x 3/16 in. hex-hd screw

4-48 nut

8-32 x 0.31 (5/16) in. rd-hd slotted screw with washer (2)

Base

Spring

Disc Assembly

Diaphragm

Baseplate

8-32 x 5/16 in. slotted pan-hd screw (7)

Palnut

Setpoint Shaft

Knob (includes 8-32 x 5/16 in. hex socket setscrew). Use 5/64 in. key to tighten.

Repair Kit—Consists of Filters, Body Gasket, 0.007 Restriction, and Restriction Gasket

Filters (2)

BodyGasket

0.007 Restriction Plate

Restriction Gasket

Plate and Tube Assembly.

8-32 x 7/16 in. pan-hd slotted screw

Connector Assembly (0.007)

Connector Assembly (0.005)

Gasket

Repair Kit—Consists of 14004378-001 Connector Assm. (0.007) & 14004376-001 Gasket

Nozzle

Flapper

Spring

4-40 x 3/16 in. rd-hd slotted screw (3).

6-32 x 3/16 in. rd-hd slotted screw

Spring

8-32 x 5/16 in. pan-hd slotted screw with star lockwasher (2)

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