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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.
Copyright © 1987 Honeywell Inc. • All Rights Reserved
LP916A-C Pneumatic
Remote Bulb Thermostats
Fig. 3. Typical LP916B fan coil application, heating/
S5783-1
S5785-2
cooling with seasonal changeover.
SERVICE DATA
S3803-1
75-5559
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Related Manuals for Honeywell LP916A
Summary of Contents for Honeywell LP916A
- Page 1 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.
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Page 2: Specifications
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. - Page 3 LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS Table 1. LP916 Specifications. Setpoint Throttling Restrication Bulb Size Mounting Range F/C Range F/C Size In. Inches Bracket Model LP916A1001 65-85F 3.5F 0.007 3/8 x 9 Separate LP916A1019 65-85F or 19-30C 3.5F or 2C 0.007...
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Page 4: Operational Check
Do not bend the capillary When temperature at the sensing element falls below setpoint tubing in a short radius. of the LP916A, branchline pressure to the normally open (n.o.) valve is lowered, and the valve is modulated open to maintain setpoint temperature. -
Page 5: Calibration Check
Replace the knob and position the pointer to correspond to the temperature sensed by the remote bulb. LP916B For direct action, follow Steps 1 through 5 for LP916A and C. For reverse action (except LP916B1058), apply 13 psi (90 kPa) main-line pressure. For the LP916B1058, apply 9 psi (62 kPa) main-line pressure. -
Page 6: Troubleshooting
LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS TROUBLESHOOTING Before troubleshooting the LP916, check branchline piping and actuators for leaks. Refer to Figure 7 to troubleshoot the LP916 Thermostat. BEGIN MAKE OPERATIONAL CHECK CHECK MAIN OPERATES CHECK PROPERLY CALIBRATION PRESSURE CORRECT DISCONNECT PRESSURE... - Page 7 LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS REPAIR The only repair recommended for the LP916 is the GASKET replacement of the plate and tube assembly, gaskets, restriction plate, and filters with connector assembly and CONNECTOR gasket. Since February 1984, models have a different...
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Page 8: Parts And Accessories
LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS 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. - Page 9 LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS S22649 Fig. 9. LP916A and C Exploded view (See Tables 2 and 3). 75-5559...
- Page 10 LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS Table 3. LP916A-C Element and lever assemblies. Assembly Part No. Part No. Bulb Size in. (mm) 316372A A1001, A1027, A1068, B1009, 3/8 x 9-1/2 B1025, B1041, B1066, C1007, (9.5 x 241) C1023 316372B A1019, B1017, B1058, C1049...
- Page 11 LP916A-C PNEUMATIC REMOTE BULB THERMOSTATS S22649 Fig. 10. LP916B Exploded view. 75-5559...
- Page 12 By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification to, the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries, from and against any liability, cost, or damages, including attorneys’...