Honeywell B Instrucciones de montaje

® U.S. Registered Trademark

SERVICE DATA

TP970 and TP9600 Series

Pneumatic Thermostats

75-7134-1

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).

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.

Contents

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

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

75-7134—1

SPECIFICATIONS

Maximum Safe Air Pressure:

25 psi (172 kPa)

Maximum Safe Temperature:

150F (66C)

(continued)

See Tables 1 though 6 for additional specifications. These

tables represent the direct replacements of existing

thermostats at the time of the introduction of the 2000 series

of thermostats. For replacement parts, see PARTS and

ACCESSORIES.

Table 1. TP970A-D Thermostat Specifications.*

Old

Model No.

New

Model No. Description Setpoint

Supply Air

Pressure

psi (kPa)

Degrees

Throttling

Range Special Features

TP970A 1004 TP970A 2004 DA, 60-90°F 18 (124) Adjustable —

TP970A 1012 TP970A 2012 2-Pipe 4079°F 2-10°F—

TP970A 1020 TP970A 2020 15-30°C (1.1-5.6°C) —

TP970A 1038 TP970A 2038 60-90°F Universal Modernization Kit with Universal

Window Cover

TP970A 1053 TP970A 2053 Honeywell Thermostat Modernization Kit

with Universal Window Cover

TP970A 1062 No

Replacement 60-90°F

Controls at

72°F Maximum

Limited Control Range (LCR)

TP970A 1087 TP970A 2087 60-72°F Universal Modernization Kit with Universal

Window Cover

TP970A 1095 TP970A 2095 40-70°F Universal Modernization Kit with Universal

Window Cover

TP970A 1103 TP970A 2103 60-90°F Includes 25 ft (7.6m) Twin Tubing and

14004407-300 Cover

TP970A 1111 TP970A 2111 Includes 25 ft (7.6m) Twin Tubing and

14004407-121 Cover

TP970A 1129 TP970A 2129 Includes 25 ft (7.6m) Sheathed Tubing and

14004406-300 Cover

TP970A 1137 TP970A 2137 Includes 25 ft (7.6m) Sheathed Tubing and

14004406-121 Cover

TP970A 1145 TP970A 2145 Convertastat Kit with Universal Window

Cover. Replacement for

2-pipe only; Johnson T4002 & T4100,

Powers TH192, Robertshaw TP2211 &

TP2212

— TP970A 2152 Quick Mount with 14004407-300 Cover

— TP970A 2160 Quick Mount with 14004407-121 Cover

— TP970A 2178 Quick Mount with 14004407-111 Cover

— TP970A 2186 Quick Mount with 14004406-300 Cover

— TP970A 2194 Quick Mount with 14004406-121 Cover

— TP970A 2202 Quick Mount with 14004406-111 Cover

TP970B 1002 TP970B 2002 RA, 2-Pipe —

TP970B 1010 TP970B 2010 15-30°C—

TP970B 1028 TP970B 2028 60-90°F Universal Modernization Kit with Universal

Window Cover

TP970B 1036 TP970B 2036 Honeywell Thermostat Modernization Kit

with Universal Window Cover

TP970B 1044 No

Replacement 60-90°F

Controls at

78°F Minimum

Limited Control Range (LCR)

*All single-temperature, pilot bleed.

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

375-7134—1

Table 1. TP970A-D Thermostat Specifications (continued).*

Table 2. TP971A-E Thermostat Specifications.*

(continued)

Old

Model No.

New

Model No. Description Setpoint

Supply Air

Pressure

psi (kPa)

Degrees

Throttling

Range Special Features

TP970B 1069 TP970B 2069 RA, 2-Pipe 60-90°F 18 (124) Adjustable

2-10°F

Includes 25 ft (7.6m) Twin Tubing with

1400406-121 Cover

TP970B 1077 TP970B 2077 (1.1-5.6°C) Convertastat Kit with Universal Window

Cover

— TP970B 2085 Quick Mount with 14004407-300 Cover

— TP970B 2093 Quick Mount with 14004407-121 Cover

— TP970B 2101 Quick Mount with 14004407-111 Cover

— TP970B 2119 Quick Mount with 14004406-300 Cover

— TP970B 2127 Quick Mount with 14004406-121 Cover

— TP970B 2135 Quick Mount with 14004406-111 Cover

TP970C 1000 TP970C 2000 DA, 2-Pipe Adjustable

5-25F

Wide Throttle Range Allows Zero Energy

Band (ZEB)

TP970C 1018 No

Replacement

(2.8-13.9C) Universal Zero Energy Band (ZEB)

Modernization Kit

TP970D 1008 TP970D 2000 RA, 2-Pipe Wide Throttle Range Allows Zero Energy

Band (ZEB)

TP970D 1016 No

Replacement Universal Zero Energy Band (ZEB)

Modernization Kit

*All single-temperature, pilot bleed.

Old

Model No.

New

Model No. Description Setpoint

Supply Air

Pressure

psi (kPa)

Degrees

Throttling

Range Special Features

TP971A 1003 TP971A 2003 DA, Heating,

2-Pipe 60-90°F

DAY Range 13 or 18

(90 or 124) Adjustable

2-10°F—

TP971A 1011 TP971A 2011 15-30°C

DAY Range (1.1-5.6°C) —

TP971A 1029 TP971A 2029 60-90°F

DAY Range 16 or 21

(110 or 145) —

TP971A 1037 TP971A 2037 13 or 18, 16 or Universal Modernization Kit

21 (90 or 124,

110 or 145) Honeywell Thermostat Modernization Kit

with Universal Window Cover

TP971A 1052 TP971A 2052 15-30°C

DAY Range 16 or 21

(110 or 145) —

TP971A 1060 TP971A 2060 60-90°F

DAY Range Includes 14004406-901 Cover

TP971A 1078 No

Replacement 60-90°F

50-75°F13 or 18

(90 or 124) Adjustable 5-

25°F (2.8-

13.9°C)

DAY, 2-10°F

(1.1-5.6°C) NITE

—

TP971A 1086 TP971A 2086 60-90°F 20 or 25 Adjustable —

TP971A 1094 TP971A 2094 DAY Range (138 or 172) 2-10°F

(1.1-5.6°C) Includes 25 ft (7.6m) Twin Tubing and

14004407-121 Cover

TP971A 1102 TP971A 2102 13 or 18, or 16

or 20 (90 or

124, or 110 or

145)

Convertastat Kit with Universal Window

Cover

*All DAY/NITE, two-temperature, pilot-bleed.

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

75-7134—1

Table 2. TP971A-E Thermostat Specifications (continued).*

Old

Model No.

New

Model No. Description Setpoint

Supply Air

Pressure

psi (kPa)

Degrees

Throttling

Range Special Features

— TP971A 2110 DA, Heating,

2-Pipe 60-90°F

DAY Range 13 or 18 Adjustable 2-

10°F (1.1-5.6°C) Quick Mount with 14004407-300 Cover

— TP971A 2128 (90 or 124) Quick Mount with 14004407-121 Cover

— TP971A 2136 Quick Mount with 14004407-111 Cover

— TP971A 2144 Quick Mount with 14004406-300 Cover

— TP971A 2151 Quick Mount with 14004406-121 Cover

— TP971A 2169 Quick Mount with 14004406-111 Cover

TP971B 1001 TP971B 2001 RA, —

TP971B 1019 TP971B 2019 Heating,

2-Pipe 16 or 21

(110 or 145) —

TP971B 1027 TP971B 2027 15-30°C

DAY Range 13 or 18

(90 or 124) —

TP971B 1035 TP971B 2035 60-90°F

DAY Range 16 or 21

(110 or 145) Includes 14004406-901 Cover

TP971B 1043 TP971B 2043 20 or 25 —

TP971B 1050 TP971B 2050 (138 or 172) Includes 25 ft (7.6m) Twin Tubing with

14004407-121 Cover

TP971C 1009 TP971C 2009 DA, 13 or 18, With Secondary Branch

TP971C 1017 TP971C 2017 Heating,

3-Pipe 15-30°C

DAY Range (90 or 124)

TP971C 1025 TP971C 2025 DA,

Cooling, 60-90°F

DAY Range 16 or 21

(110 or 145)

TP971C 1041 TP971C 2041 3-Pipe 20 or 25

TP971D 1007 TP971D 2007 DA, Cooling,

2-Pipe (138 or 172) NITE Set-Up (75 to 100F)

TP971E 1004 TP971E 2004 RA, Cooling,

2-Pipe 13 or 18

(90 or 124)

*All DAY/NITE, two-temperature, pilot-bleed.

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

575-7134—1

Table 3. TP972A Thermostat Specifications.*

Action Supply Air Degrees

Old

Model No.

New

Model No.

Left

Bimetal

Right

Bimetal Setpoint

Pressure

psi (kPa)

Throttling

Range Special Features

TP972A 1002 TP972A 2002 60-90°F 13 (Cooling) or Adjustable —

TP972A 1010 TP972A 2010 R.A. D.A. 15-30°C 18 (Heating) 2-10°F—

TP972A 1028 TP972A 2028 60-90°F (90 or 124) (1.1-5.6°C) Universal Modernization Kit with Universal

Window Cover

TP972A 1036 TP972A 2036 60-90°F

(Cooling) Energy Conservation, Separate Setpoints

TP972A 1044 TP972A 2044 (50-75°F

(Heating) Honeywell Thermostat Modernization Kit

with Universal Window Cover

TP972A 1051 No Replacement 78-90°F

(Cooling)

60-72°F

(Heating)

Separately

Adjustable

2-10°F

(1.1-5.6°C)

Limited Control Range (LCR)

TP972A 1077 No Replacement 75-90°F

(Cooling) Setpoint Stop at 75F Minimum

TP972A 1085 No Replacement 50-75°F

(Heating) 16 (Cooling) or

21 (Heating)

(110 or 145)

TP972A 1093 No Replacement 78-90°F

(Cooling) 13 (Cooling) or

18 (Heating) Limited Control Range (LCR)

TP972A 1101 No Replacement 60-72°F

(Heating) (90 or 124) Universal Limited Control Range (LCR)

Modernization Kit

TP972A 1119 No Replacement 78-90°F

(Cooling) 13 (Cooling) or

18 (Heating) Limited Control Range (LCR)

TP972A 1127 No Replacement 55-65°F

(Heating) (90 or 124) Universal Limited Control Range (LCR)

Modernization Kit

TP972A 1143 TP972A 2143 D.A. R.A. 60-90°F 14 (Heating) or

19 (Cooling)

(97 or 131)

Separately

Adjustable

2-10°F

Specifically for replacing Johnson

Cooling/Heating Thermostats

TP972A 1150 TP972A 2150 R.A. D.A. 15-30°C Cooling

12-24 Heating 13 (Cooling) or

18 (Heating)

(90 or 124)

(1.1-5.6°C) Energy Conservation, Separate Setpoints

TP972A 1168 TP972A 2168 D.A. R.A. 60-90°F

(Cooling)

50-75°F

16 (Cooling) or

21 (Heating)

110 or 145)

TP972A 1176 TP972A 2176 D.A. R.A. (Heating) 20 (Cooling) or

25 (Heating)

(138 or 172)

TP972A 1184 TP972A 2184 13 (Cooling or

18 (Heating) Includes 14004406-901 Cover, Separate

Setpoints

— TP972A 2192 R.A. D.A. 60-90°F (90 or 124) Includes Universal Window Cover

— TP972A 2200 D.A. R.A. 14 (Cooling) or

19 (Heating)

(97 or 131)

—

*All single-temperature, tw0-pipe, two-element, automatic changeover, and cooling/heating.

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

75-7134—1

Table 4. TP973A and B Thermostat Specifications.*

Old

Model No.

New

Model No. Action Setpoint

Supply Air

Pressure

psi (kPa)

Degrees

Throttling

Range Special Features

TP973A 1068 TP973A 2068 DA 60-90°F 18 (124) Adjustable

2-10°F

Universal Modernization Kit with Universal

Window Cover

TP973A 1076 TP973A 2076 (1.1-5.6°C) —

TP973A 1084 TP973A 2084 15-30°C—

TP973A 1092 TP973A 2092 60-90°F Honeywell Thermostat Modernization Kit with

Universal Window Cover

TP973A 1100 TP973A 2100 Includes 14004406-901 Cover

TP973A 1117 No Replacement Includes 25 ft (7.6m) Twin Tubing and

TP973A 1126 No Replacement Blank Plastic Cover

TP973A 1134 No Replacement

TP973A 1142 No Replacement

TP973A 1159 TP973A 2159 —

TP973A 1167 TP973A 2167 Includes 14004407-121 Cover

TP973A 1175 TP973A 2175 Includes 14004407-300 Cover

TP973A 1183 TP973A 2183 —

TP973B 1066 TP973B 2066 RA —

TP973B 1074 TP973B 2074 15-30°C—

TP973B 1090 TP973B 2090 60-90°F Includes 1400406-901 Cover

TP973B 1108 TP973B 2108 —

TP973B 1116 TP973B 2116 —

TP973B 1124 TP973B 2124 15-30°C—

TP973B 1132 TP973B 2132 60-90°F Includes 14004407-121 Cover

TP973B 1140 TP973B 2140 Includes 14004407-300 Cover

TP973B 1157 TP973B 2157 Includes 25 ft (7.6m) Twin Tubing and

14004407-121 Cover

*All one- or two-pipe, bleed type.

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

775-7134—1

Table 5. TP974A, TP978A-E, TP979A-E Thermostat Specifications.

Old

Model No. New

Model No. Action Setpoint

Supply Air

Pressure

psi (kPa)

Degrees

Throttling

Range Special Features

TP974A 1000 TP974A 2000 DA, 1- or

2-Pipe Sensor

Bleed Type

50-100°F

(10-38°C)

Range

18 (124)

3-15 (21-103)

Output

— Sensor for use with

RP908 & RP920

Controller

TP978A 1006 No

Replacement DA Heating

DA Cooling 60-73°F

Heating 18 (124) 2-10°F

(1.1-5.6°C) ZEB Energy

Conservation, Setpoint

Stop 73°F (Heating),

77°F (Cooling)

TP978B 1004 No

Replacement RA heating

DA Cooling 77-90°F

Cooling

TP978C 1002 No

Replacement DA Heating

RA Cooling

TP978D 1000 No

Replacement RA Heating

RA Cooling

TP978E 1007 TP978E 2007 RA (Right Side)

DA (Left Side) 68-82°F 0.18 (1) 1-4°F Includes Cover

Special System-

Powered Thermostat

for Carrier

TP979A 1005 TP979A 2005 DA Heating

DA Cooling 60-90°F 18 (124) Adjustable

2-10°F

(1.1-5.6°C)

—

TP979B 1003 TP979B 2003 RA Heating

RA Cooling —

TP979C 1001 TP979C 2001 DA Heating or

Cooling

RA Heating or

Cooling

—

TP979D 1009 TP979D 2009 DA Heating

DA Cooling 13 (90) Day

18 (124) Nite Day/Nite Heat with

night set down; Cool

with night set up.

TP979E 1006 TP979E 2006 DA Heating

RA Cooling

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

75-7134—1

Table 6. TP9600 Thermostat Specifications.

Model No. Description Setpoint Slot Includes Stat.

Single Temperature, Two-Pipe:

TP9600A 1007 DA, Open Windows Open TP970A 2004

TP9600B 1006 RA, Open Windows Open TP970B 2002

TP9603A 1001 DA, Close Windows Closed TP970A 2004

TP9603B 1000 RA, Close Windows Closed TP970B 2002

Day/Night, Two-Pipe:

TP9610A 1006 DA, Open Windows Open TP971A 2003

TP9610B 1005 RA, Open Windows Open TP971B 2001

TP9613A 1000 DA, Close Windows Closed TP971A 2003

TP9613B 1009 RA, Close Windows Closed TP971B 2001

Heating/Cooling, Two-Pipe:

TP9620A 1005 DA, Open Windows Open TP972A 2002

TP9623B 1009 RA, Close Windows Closed TP972B 2002

Single Temperature, One or Two-Pipe:

TP9630A 1004 DA, Open Windows Open TP973A 2076

TP9630B 1003 RA, Open Windows Open TP973B 2066

TP9633A 1008 DA, Close Windows Closed TP973A 2076

TP9633B 1007 RA, Close Windows Closed TP973B 2066

OPERATION

TP970A,B and TP9600A,B

When using a TP970A or TP9600A (Fig. 1) in heating

applications with a normally open valve, a fall in temperature

lowers Branchline Pressure (BLP) to the valve. THis lower

BLP provides proportional valve action matching the existing

load requirements. When a TP970B or TP9600B is used in a

cooling application, a rise in temperature causes the TP970B

or TP9600B to lower BLP. The energy conservation models

limit control temperature to a maximum (heating) or minimum

(cooling) of 72F (24C).

SUPPLY

TP970A,B OR

TP9600A,B

N.O.

M B

C3535-1

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.

Various ZEB ranges, heating control points, and cooling

control points are obtained by selecting the appropriate

thermostat setpoint, throttling range, and spring range or ratio

relays.

(100)

(90)

(80)

(70)

(60)

(50)

(40)

(30)

(20)

(10)

015 12.5 10 7.5 5 2.5 1512.5107.552.5

SETPOINT

(8) (7) (6) (5) (4) (3) (2) (1) (8)(7)(6)(5)(4)(3)(2)(1)

BRANCHLINE PRESSURE—PSI (kPa)

DEVIATION IN SPACE TEMPERATURE—DEGREES F (C)

BELOW SETPOINT ABOVE SETPOINT

C3536

TP970C MINIMUM

THROTTLING RANGE =

5F (2.8C)

TP970C MAXIMUM

THROTTLING RANGE =

20F (11.1C)

Fig. 2. TP970C Space Temperature vs. Branchline

Pressure.

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

975-7134—1

(100)

(90)

(80)

(70)

(60)

(50)

(40)

(30)

(20)

(10)

015 12.5 10 7.5 5 2.5 1512.5107.552.5

SETPOINT

(8) (7) (6) (5) (4) (3) (2) (1) (8)(7)(6)(5)(4)(3)(2)(1)

BRANCHLINE PRESSURE—PSI (kPa)

DEVIATION IN SPACE TEMPERATURE—DEGREES F (C)

BELOW SETPOINT ABOVE SETPOINT

C3537

TP970D MINIMUM

THROTTLING RANGE =

5F (2.8C)

TP970D MAXIMUM

THROTTLING

RANGE = 20F (11.1C)

Fig. 3. TP970D Space Temperature Vs Branchline

Pressure.

VALVE

OPEN

VALVE

CLOSED

4 DEGREES F

(2.2 DEGREES C)

ZERO

ENERGY

BAND

THERMOSTAT SETTING

TR=10 DEGREES F

(5.6 DEGREES C)

20C 22C 24C

66F 68F 70F 72F 74F 76F 78F

TP970C

DIRECT

ACTING

COOLING

VALVE

9 TO 13 PSI

(62 TO 90 kPa)

SPRING

HEATING

VALVE

2 TO 5 PSI

(14 TO 34 kPa)

SPRING N.C.

N.O.

M B

C3538

Fig. 4. Typical TP970C Operation Using Selected Spring

Range Valve Operators.

TP970C

DIRECT

ACTING

HEATING

VALVE

3 TO 10 PSI

(21 TO 68.9 kPa)

COOLING

VALVE

3 TO 10 PSI

(21 TO 68.9 kPa)

RP971A—3 PSI

RANGE—SET

10 PSI (68.9 kPa)

START

RP971A—3 PSI

SPAN—SET

3.9 PSI (26.9 kPa)

START M

MM B

EXH

N.O.

EXH

N.C.

C3539

VALVE

OPEN

VALVE

CLOSED

20C 22C 24C

66F 68F 70F 72F 74F 76F 78F

4 DEGREES F

(2.2 DEGREES C)

ZERO

ENERGY

BAND

THERMOSTAT SETTING

TR=10 DEGREES F

(5.6 DEGREES C)

Fig. 5. Typical TP970C Operation Using Ratio Relays.

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. 6), a fall in room temperature causes the

thermostat to lower the BLP to the valve, providing a

proportional action matching the existing load requirement.

When the supply air pressure is 13 psi (90 kPa), the

thermostat controls at the normal DAY setting. When the

supply air is switched to 18 psi (124 kPa), the thermostat

controls at the reduced NITE setting. Models with 16 or 21 psi

(110 or 145 kPa) pressure are available. The TP971D is the

same as the TP971A with the addition of NITE setup. The

TP971E is the same as the TP971B with the addition of NITE

setup.

The manual reset lever protrudes through the DAY/AUTO slot

in the cover. The lever is used to manually reset the

thermostat from AUTO to DAY to restore day operation. The

lever automatically returns to the AUTO position when the

supply air reaches DAY pressure.

TP971A OR

TP9610A

DAY

13 PSI

(90 kPa)

NITE

18 PSI

(124 kPa)

M B

N.O.

HOT WATER

OR STEAM

SUPPLY C3540-1

Fig. 6. TP971A and TP9610A Typical Operation.

TP971C

The TP971C can be used with a unit ventilator to control a

heating valve, outdoor- and return-air dampers, and blower

motor (Fig. 7). When supply air pressure is 13 psi (90 kPa),

the TP971C controls the valve and damper at the normal DAY

setpoint. When supply air pressure is 18 psi (125 kPa), the

TP971C closes the outdoor-air damper and switches the

blower from constant to automatic operation. The TP971C

then cycles the unit at reduced night setpoint. Models with 18

or 21 psi (125 or 145 kPa) pressure are available.

The manual reset lever protrudes through the DAY/AUTO slot

in the cover. The lever may be used to manually reset the

TP971C from AUTO to DAY to restore DAY operation,

including outdoor-air damper operation. The reset lever

automatically returns to the AUTO position when the supply

air reaches DAY pressure.

TP970 AND TP9600 SERIES PNEUMATIC THERMOSTATS

75-7134—1

MHI

N.C. N.O.

D/N MP516C

FAN

P638 G

TP971

VALVE HEATING

COIL

120V AC

50/60 HZ

AIR

STREAM

STAT

13/18 PSI

(90/124 kPa)

D/N

MSB K H

FILTER

DISCHARGE AIR

OUTDOOR

AIR RETURN

AIR

C3541

Fig. 7. TP971C Typical Operation.

TP972A and TP9620A

The standard TP972Aand TP9620A is RA for cooling and DA

for heating. A rise in temperature at the TP972Aand TP9620A

with main air pressure at 13 psi (90 kPa) causes the

TP972Aand TP9620A to lower BLP, opening the valve to

control the temperature with chilled water. A fall in

temperature at the TP972Aand TP9620A with main air

pressure at 18 psi (124 kPa) causes the TP972Aand

TP9620A to lower BLP, opening the valve to control the

temperature with hot water (Fig. 8).

TP972A OR

TP9620A

13 PSI

(90 kPa) RA

18 PSI

(124 kPa)

DA N.O.

M B

S/W

HOT WATER/CHILLED

WATER SUPPLY C3542-1

Fig. 8. TP972A and TP9620A Typical Operation with a

Normally Open Water Valve Assembly.

Models are available that limit the cooling setpoint to a

minimum of 75 or 78F, the heating setpoint to a maximum of

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. 9). A

rise in temperature at the TP973B or TP9630B causes the

TP973B or TP9630B to lower BLP, providing proportional

control of existing load requirements for cooling.

Fig. 9. TP973A and TP9630A Typical Operation, One-Pipe

Using External Restriction.

TP974A

The TP974A Sensor (Fig. 10) provides a pneumatic output

signal of 3 to 15 psi (21 to 103 kPa) in direct relation to the

sensed temperature, allowing direct and remote readout of

the temperature. An RP908 or RP920 Controller is used with

the TP974A to convert the output into a usable signal to

operate a pneumatic valve, damper, or other equipment.

TP973A OR

TP9630A

N.O.

HOT WATER OR

STEAM SUPPLY C3543-1

TP974

VALVE

TEMP

GAGE

4 8 9

2 3 1

RP920

C3544A

Fig. 10. TP974 Typical Operation.

TP978E

NOTE: To vary the ZEB between heating and cooling

operation, adjust the setpoints on the TP978E.

A fall in temperature within the cooling range at the TP978E

causes the TP978E to increase the BLP of the cooling

element. This action proportionally closes the normally open

cooling valve (Fig. 11) to maintain the temperature set on the

high range portion of the TP978E. The normally open heating

valve is held closed by the high BLP on the DA side of the

TP978E.

A continued fall in temperature, into the heating range at the

TP978E, lowers the BLP of the heating element. This action

proportionally opens the normally open heating valve to

maintain the temperature set on the low range portion of the

TP978E.

DA RA

TP978E

HEATING

VALVE COOLING

VALVE

H C

N.O. N.O.

C3545

EXTERNAL

RESTRICTORS

0.005

Fig. 11. TP978A Typical Operation.

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