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Honeywell B Service Data

Tp970 and tp9600 series pneumatic thermostats.
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GENERAL

The TP970 and TP9600 Series Pneumatic Thermostats are
one-, two-, or three-pipe, proportioning thermostats with
bimetal elements. They are suitable for controlling dampers
and/or valves in HVAC systems.

APPLICATION

TP970A-D and TP9600A,B
The TP970 and TP9600 are single-temperature, pilot-bleed,
two-pipe thermostats. The TP970A and TP9600A are used for
heating (Direct Acting [DA]), the TP970B and the TP9600B for
cooling (Reverse Acting [RA]), and the TP970C and D for
heating/cooling. There are TP970A and B models with Limited
Control Range (LCR) for energy conservation. The TP970C
and D have a wide throttling range capability, allowing an
adjustable Zero Energy Band (ZEB) between heating and
cooling operations.
TP971A-E and TP9610A,B
The TP971A-E and TP9610A,B are two-temperature, pilot-
bleed, two-pipe thermostats for DAY/NITE operation, with
automatic switchover from mainline pressure. The TP971C is
a three-pipe thermostat for unit ventilator DAY/NITE
application.
TP972A and TP9620A
The TP972A and TP9620A are single-temperature, pilot-
bleed, two-pipe thermostats with cooling/heating cycles and
automatic switchover from mainline pressure. The
TP972A2143 is designed specifically for replacing Johnson
cooling/heating thermostats (see SPECIFICATIONS section).
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
TP970 and TP9600 Series
Pneumatic Thermostats
TP973A,B and TP9630A,B
The TP973A, B and TP9630A,B are one- or two-pipe bleed-
type thermostats for heating or cooling applications.
TP974A
The TP974A is a pneumatic space temperature sensor for
either one- or two-pipe applications. It is suitable as a remote
temperature indicator or as the sensor for a receiver
controller.
TP978A-E
The TP978 is a dual-element bleed-type thermostat used in
dual one-pipe applications, suitable for use with variable
volume systems. These thermostats may be used to control
separate heating and cooling actuators in sequence, with a
Zero Energy Band (ZEB) for energy conservation. The
heating setpoint is limited to 73F (23C) maximum, and the
cooling setpoint is limited to 77F (25C) minimum. Heating and
cooling are available in both DA and RA configurations.
Except for the TP978E, there are no upgraded replacements
for the TP978.
TP979A-E
The TP979 contains two cooling/heating, DAY/NITE
thermostats. They are one- or two-temperature, two-pipe
thermostats for independent proportioning control of heating
and cooling.
General ............................................................................... 1
Application .......................................................................... 1
Specifications ...................................................................... 2
Operation ............................................................................ 8
Maintenance ....................................................................... 11
General ............................................................................... 11
Cleaning .............................................................................. 11
Calibration ........................................................................... 12
Troubleshooting .................................................................. 14
Repair .................................................................................. 15
Parts and Accessories ........................................................ 18
Accessories ......................................................................... 21
SERVICE DATA
Contents
75-7134-1

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   Summary of Contents for Honeywell B

  • Page 1: Table Of Contents

    Copyright © 1997 Honeywell Inc. • All Rights Reserved TP970 and TP9600 Series Pneumatic Thermostats TP973A,B and TP9630A,B The TP973A, B and TP9630A,B are one- or two-pipe bleed- type thermostats for heating or cooling applications. TP974A The TP974A is a pneumatic space temperature sensor for either one- or two-pipe applications.

  • Page 2: Specifications

    — 2-10 F — (1.1-5.6 C) — Universal Modernization Kit with Universal Window Cover Honeywell Thermostat Modernization Kit with Universal Window Cover Limited Control Range (LCR) Universal Modernization Kit with Universal Window Cover Universal Modernization Kit with Universal Window Cover Includes 25 ft (7.6m) Twin Tubing and...

  • Page 3

    Band (ZEB) Universal Zero Energy Band (ZEB) Modernization Kit Special Features — — — Universal Modernization Kit Honeywell Thermostat Modernization Kit with Universal Window Cover — Includes 14004406-901 Cover — — Includes 25 ft (7.6m) Twin Tubing and 14004407-121 Cover...

  • Page 4

    TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS Table 2. TP971A-E Thermostat Specifications (continued).* Model No. Model No. Description — TP971A 2110 DA, Heating, 2-Pipe — TP971A 2128 — TP971A 2136 — TP971A 2144 — TP971A 2151 — TP971A 2169 TP971B 1001 TP971B 2001 TP971B 1019 TP971B 2019...

  • Page 5

    — 2-10 F — (1.1-5.6 C) Universal Modernization Kit with Universal Window Cover Energy Conservation, Separate Setpoints Honeywell Thermostat Modernization Kit with Universal Window Cover Separately Limited Control Range (LCR) Adjustable 2-10 F (1.1-5.6 C) Setpoint Stop at 75F Minimum...

  • Page 6

    TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS Table 4. TP973A and B Thermostat Specifications.* Model No. Model No. Action TP973A 1068 TP973A 2068 TP973A 1076 TP973A 2076 TP973A 1084 TP973A 2084 TP973A 1092 TP973A 2092 TP973A 1100 TP973A 2100 TP973A 1117...

  • Page 7

    Table 5. TP974A, TP978A-E, TP979A-E Thermostat Specifications. Model No. Model No. TP974A 1000 TP974A 2000 DA, 1- or 2-Pipe Sensor Bleed Type TP978A 1006 DA Heating Replacement DA Cooling TP978B 1004 RA heating Replacement DA Cooling TP978C 1002 DA Heating Replacement RA Cooling TP978D 1000...

  • Page 8: Operation

    TP970A,B OR TP9600A,B N.O. SUPPLY Fig. 1. TP970A,B and TP9600A,B Typical Operation. TP970C and D The TP970C and D with wide throttling range (Fig. 2 and 3) allow use of heating and cooling valve assemblies with either selected spring ranges (Fig. 4) or ratio relays (Fig. 5) to achieve a ZEB range.

  • Page 9

    (5.6 DEGREES C) Fig. 5. Typical TP970C Operation Using Ratio Relays. TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS TP971A, B, D, E and TP9610A,B These thermostats provide a BLP proportional to the ambient temperature. In a heating application with a normally open valve (Fig.

  • Page 10

    72 or 75F. They work with 13/18, 16/21, 25/20, 19/14, or 20/ 25 psi changeover. Some models are DA for both cooling and heating. TP973A,B and TP9630A,B A fall in temperature at the TP973A or TP9630A causes the TP973A or TP9630A to lower BLP, providing proportional control of existing load requirements for heating (Fig.

  • Page 11: Maintenance

    TP979A-E The TP979 thermostats provide independent control of heating and cooling with dual thermostats and separate setpoints and branch lines. This enables ZEB operation without selected actuator springs or ratio relays (Fig. 12). TP979C HEATING VALVE PNEUMATIC OPERATOR WITH 4 TO 11 PSI (28 to 76 kPa) N.O.

  • Page 12: Calibration

    If either the throttling range adjustment or calibration screw were changed, recalibrate the thermostat. 4. See TP970A and B, beginning at Step 1, for the balance of TP970C and D calibration. TP971A-E and TP971A,B 1. With 13 psi (90 kPa) main air pressure, turn the DAY (SUMMER) (left) calibration screw (Fig.

  • Page 13

    4. Remove the gage and replace the cover. TP973A,B and TP9630A,B If the TP973A, B and TP9630A,B are not properly calibrated but the remainder of the system is operating properly, turn the calibration screw until the TP973A, B or TP9630A,B performs as in Step 2 under CALIBRATION CHECK.

  • Page 14: Troubleshooting

    TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS TROUBLESHOOTING See Table 7 for troubleshooting procedures. Table 7. TP970 Series Thermostat Troubleshooting Procedures. Problem Excessive noise If there is an antihum spring, it is not touching the throttling plate. If there is no antihum spring or cone, the adhesive paper dot has fallen off of the throttling plate.

  • Page 15: Repair

    REPAIR Thermometer Replacement NOTE: The following procedure requires a 1/4-in. (6 mm) nut driver and a small screwdriver. 1. Insert the blade of a small screwdriver under the bimetal (Fig. 17) and pry up. Older style thermostats have a locking ring. Insert the blade between the ring and white nylon bushing and pry the ring from the thermometer bimetal mounting post.

  • Page 16

    TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS TYPICAL PNEUMATIC ASSEMBLY SCREW NOZZLE, THROTTLING PLATE AND BIMETAL ASSEMBLY Fig. 18. Nozzle, Throttling Plate, Bimetal Assembly Replacement. Restrictor Block and Filter Replacement CAUTION When replacing these parts, use extreme caution to prevent dirt, dust, or chips from entering various chambers and openings of the thermostat.

  • Page 17

    Day/Auto Lever Assembly Replacement 1. Remove the three Phillips head screws that fasten the lever mechanism to the back of the thermostat (Fig. 20). 2. Lift off the cover plate and remove the lever (with attached seal). 3. Lift the spring from the post. 4.

  • Page 18: Parts And Accessories

    TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS PARTS AND ACCESSORIES Parts List TP970-TP974 and TP9600-TP9630 See Figures 22 and 23, and Table 8 for TP970-TP974 and TP9600-TP9630 Thermostat repair parts and assemblies. REPLACE THE SETPOINT CAM ASSEMBLY AND NOZZLE, THROTTLING PLATE, AND BIMETAL ASSEMBLY TOGETHER.

  • Page 19

    Table 8. TP970-TP974 and TP9600-TP9630 Thermostat Repair Parts and Assemblies. Part No. 14004459-001 Scaleplate Bag Assembly (60 to 90F) - TP970A-D, TP973A, B 14004459-002 Scaleplate Bag Assembly (40 to 70F) - TP970A-D 14004459-003 Scaleplate Bag Assembly (15 to 30C) - TP970A-D, TP973A, B...

  • Page 20

    14004419-001 Gasket, Restrictor block (included with 14002374-XXX) 14001865-001 Filter 14002374-001 Restrictor Block Assembly (0.005 restrictor, 2 pipe) - TP970A-D; TP971A, B, D, E; TP972A; TP973A, B 14002374-005 Restrictor Block Assembly (0.005 restrictor, 3 pipe) - TP971C 14002374-006 Restrictor Block Assembly (0.007 restrictor, 2 pipe) - TP974A...

  • Page 21: Accessories

    Table 9. TP978E Thermostat Repair Parts and Assemblies. Model Key No. TP979A-E See Figure 25 and Table 10 for TP979A-E Thermostat repair parts and assemblies. Fig. 25. TP979 Exploded View. TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS Part No. — Screw, No. 4 x 3/16 pan head (2) —...

  • Page 22

    311699 Internal Tubing Spring—Used as strain relief inside plastic tubing Modernization Fitting, Universal: 14002573-001 One- and Two-Pipe 14002573-002 Three-Pipe 14003192-001 Serviceline Adapter Kit (for Honeywell stats prior to 1985) Mounting Ring: 14004458-001 Flush 14004458-001 Surface 14000885-001 Standoff Plaster Ring 14004300-001 Setpoint (Indicator Adjustment) Knob Retainer Kit—Used to prevent setpoint knob breakage...

  • Page 23

    —— —— 60 70 80 90 *When ordering, use complete part number including three-digit suffix. †14004406-008 Cover also suitable for vertical mounting. TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS Part Number 14004406-XXX* Honeywell Logo Setpoint Slot Open Closed Mounting Mounting Vert...

  • Page 24

    TP9613B TP9620A TP9623B TP9630A TP9630B TP9633A TP9633B Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 3N7 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. No Logo Setpoint Slot...

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