Honeywell T915 Product Information Sheet
Proportional Temperature
Remote bulb temperature controllers for ducts,
tanks, boilers, pipes, and other heat exchangers.
These controllers are used with modulating motors
for proportional control of three-wire, low-voltage
valves or damper motors.
T915A-D,F,M,P
Controllers
■ T915M and T915P have spdt switches to control Series
20 motors. T915M controls at high or low end; T915P
controls at low end.
■ Controllers may be used to regulate temperatures of
either air or liquids.
■ All models ambient compensated.
■ Capillary tubing allows remote bulb mounting up to 20 ft
(6.0m) from controller case.
■ Temperature setting scale markings in both Fahrenheit
and Celsius.
■ Steel case with clear plastic cover makes settings readily
visible.
■ Surface mounting using two screws through back of case.
CONTENTS
Specifications .................................................2
Ordering Information.....................................2
Installation .....................................................4
Operation .......................................................6
Settings and Adjustments................................6
1 60-2201—7S. M. • Rev. 10-94 • ©Honeywell Inc. 1994 • Form Number 60-2201—7
T915A-D,F,M,P
SPECIFICATIONS • ORDERING INFORMATION
Specifications
MODELS (also refer to Table 1):
T915A: One potentiometer for controlling a modulating
motor. Nonadjustable throttling range.
T915B: Two potentiometers for controlling two mod-
ulating motors in unison or in sequence, factory set for
unison control. Nonadjustable throttling range.
T915C: One potentiometer for controlling a modulating
motor. Adjustable throttling range.
T915D: Two potentiometers for controlling two modu-
lating motors in unison. Adjustable throttling range.
T915F: Two potentiometers for controlling two mod-
ulating motors in sequence. Adjustable deadspot between potentiometers and adjustable throttling range.
T915M and T915P: One potentiometer and Series 20
contacts for controlling one modulating motor and one
Fig. 1—Mounting dimensions in in. (mm).
2-3/4 (70)
1-1/16
(27)
5-1/32
(128)
3-7/8
(98)
5-1/2
(140)
13/16
(21)
7/8 (22.2) DIA.
13/16
(21)
Series 20 motor or relay in sequence on a temperature
rise. The Series 20 contacts on the T915M operate
above the throttling range and the Series 20 contacts
on the T915P operate below the throttling range. Both
models have nonadjustable throttling ranges and differentials.
BULB HOLDER: Furnished with copper elements.
RANGES: Fahrenheit and Celsius on the same scaleplate.
TEMPERATURE SETTING: Screws on top of controller
provide main and differential adjustment.
ELECTRICAL RATING: Low voltage ac only.
POTENTIOMETER: Standard 135 ohm. Available with
280 ohm potentiometer in some models; see Table 1.
FINISH: Gray enamel.
DIMENSIONS: See Fig. 1.
4-1/2
(114)
3-13/32
MOUNTING HOLE
KNOCKOUTS (2)
3-23/32
(95)
1-3/32
(28)
1-13/16
(46)
(87)
1-5/32
(29)
1-3/16
(30)
M7358
Ordering Information
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE
Catalog or price sheets for complete ordering number, or specify—
1. Order number. 4. Capillary length.
2. Scale range. 5. Accessories, if desired.
3. Bulb size.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
1. Your local Home and Building Control Sales Office (please check the white pages of your phone directory).
2. Home and Building Control Customer Logistics
Honeywell, Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 (612) 951-1000
In Canada—Honeywell Limited/Honeywell Limitée, 740 Ellesmere Road, Scarborough, Ontario M1P2V9. International Sales and
Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico,
Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
®
60-2201—7 2
T915A-D,F,M,P
SPECIFICATIONS
ACCESSORIES:
1. 33312B Knurled Knob for finger adjustment of temp-
erature setpoint.
2. 311266D Bulb Holder for mounting sensing bulb in an
3. Immersion well assemblies or pressure fittings—see
appropriate Honeywell specification or TRADELINE
Catalog to order. Wells available in copper and stainless
steel.
air duct (furnished with some models).
TABLE 1—T915 TEMPERATURE CONTROLLER MODELS.
Maximum
Model
Number °F °C °F °C °F °C ft m in. mm Fill
T915A 15 to 90 -9 to +32 3,
T915B 15 to 90 -9 to +32 3,
T915C 15 to 90 -9 to +32 7 to 38 3.9 to
T915C 15 to 90 -9 to +32 7 to 38 3.9 to
T915C 15 to 90 -9 to +32 7 to 38 3.9 to
T915C 15 to 90 -9 to +32 7 to 38 3.9 to
T915C 15 to 90 -9 to +32 7 to 38 3.9 to
T915C 80 to 210 27 to 99 6 to 32 3.3 to
T915C 80 to 120 27 to 99 6 to 32 3.3 to
T915D 15 to 90 -9 to +32 7 to 38 3.9 to
T915D 15 to 90 -9 to +32 7 to 38 3.9 to
T915D 105 to
T915F 15 to 90 -9 to +32 8 to 52 4.4 to
T915F 15 to 90 -9 to +32 8 to 52 4.4 to
T915Me15 to 90 -9 to +32 3,
T915M 105 to
T915Pf15 to 90 -9 to +32 3,
a
Throttling range adjustable except where noted.
b
LTD—Limited-fill elements require that controller, including all of capillary (except bulb and adjacent 4 in. [102 mm] of capillary), be in an ambient
temperature at least 10°F (5.6°C) above bulb temperature. These controllers become inoperative when temperature of controlled air or liquid is above 120°F
(49°C).
HT—High-temperature-fill elements require that controller and all of capillary (except bulb and adjacent 4 in. [102 mm] of capillary) be in an ambient
temperature at least 10°F (5.6°C) below bulb temperature.
CA—Cross ambient.
c
Wiper moves toward W on temperature rise.
d
Factory set for unison control.
e
Spdt contacts operate approximately 1°F (0.6°C) above the throttling range (0.5°F [0.3°C] differential at midscale).
f
Spdt contacts operate approximately 1°F (0.6°C) below the throttling range (0.5°F [0.3°C] differential at midscale).
Scale
Range
40 to 105 9 to 39 5.0 to
220
40 to 105 3,
220
fixed
fixed
fixed
fixed
fixed
Throttle
Range
c
f
c
c
c
a
1.7,
fixed
1.7,
fixed
21.1
21.1
21.1
21.1
21.1
17.8
17.8
21.1
21.1
21.7
28.9
28.9
1.7,
fixed
1.7,
fixed
1.7,
fixed
Bulb
Temp -
erature
200 93 5 1.5 1/2 x 4 13 x 102 LTD 135 1 modulating
c
130 54 5 1.5 11/16 x
f
200 93 11 3.4 1/2 x 4 13 x 102 LTD 135 1 modulating
200 93 20 6.1 1/2 x 4 13 x 102 LTD 135
130 54 5 1.5 11/16 x
130 54 15 4.5 11/16 x 7 17 x 177 CA 135
130 54 5 1.5 11/16 x
230 110 5 1.5 1/2 x 4 13 x 102 HT 135
230 110 20 6.1 1/2 x 4 13 x 102 HT 135
130 54 5 1.5 11/16 x
130
240 116 5 1.5 1/2 x 4 13 x 102 HT 135
130 54 5 1.5 11/16 x
130
130 54 5 1.5 11/16 x
c
240
c
130 54 5 1.5 11/16 x
c
Capillary
(Copper) Size of Bulb
54 20
54 20
116 5
6.1 11/16 x
6.1 11/16 x
1.5 1/2 x 4 13 x 102 HT 135 Series 20 motor
Type
17 x 368 CA 135 2 modulating
14-1/2
17x 368 CA 135
14-1/2
17 x 368 CA 280
14-1/2
17 x 368 CA 135 2 modulating
14-1/2
17 x 445 CA 135 unison
17-1/2
17 x 368 CA 135 2 modulating
14-1/2
17 x 445 CA 135 sequence
17-1/2
17 x 368 CA 135 1 modulating
14-1/2
17 x 368 CA 135
14-1/2
of
Potenti -
ometer
Resistance
b
(ohms) Controls
motor
motors in
unison or
sequence
motor
motors in
motors in
motor and 1
or relay
®
d
3 60-2201—7
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