Honeywell T921A- Manual
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Table of Contents:
- Page 2 – SPECIFICATIONS • ORDERING INFORMATION; Ordering Information; Specifications; TRADELINE
- Page 3 – SPECIFICATIONS; Scale
- Page 4 – INSTALLATION; Installation; CAUTION; WHEN INSTALLING THIS PRODUCT...
- Page 5 – WIRING; Be sure all wiring must complies with applicable electri-
- Page 6 – INSTALLATION • SETTING AND ADJUSTING; Setting and Adjusting; TEMPERATURE SETTING; Adjust all T921 models at the top of the thermostat for
- Page 7 – SETTING AND ADJUSTING • OPERATION; Model; Operation
- Page 8 – OPERATION␣; CHECKOUT
1
60-2242—2
J. D. • Rev. 1-94 • ©Honeywell Inc. 1994 • Form Number 60-2242—2
T921A,B,E-G Proportional
Control Thermostats
T921 Thermostats provide 3-wire, low voltage
proportional control for Series 90 (135 ohm) valve
motors, damper motors, and balancing relays in
heating or cooling system applications.
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Accessory faceplates available for horizontal mount-
ing of T921A,B,E models.
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COOL-HEAT changeover switch in the T921B.
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Night setback mechanism and switch in the T921E.
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A spdt (single pole double throw) Class 2 auxiliary
switch in the T921F,G, which operates at the low
(T921F) and high (T921G) end of the throttling
range.
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A bellows element adjusts the potentiometer slider
to regulate motor operation.
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Various temperature ranges are available.
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All models are available with a thermometer and a
locking cover.
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T921A
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T921B
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T921E
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T921F
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T921G
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 4
Setting and Adjusting ..................................... 7
Operation ....................................................... 7
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Summary
60-2242—2 2 T921A,B,E-G SPECIFICATIONS • ORDERING INFORMATION Ordering Information When purchasing replacement and modernization products from your TRADELINE ® wholesaler or your distributor, refer to the TRADELINE ® Catalog or price sheets for complete ordering number or specify— 1. Model number.2....
3 60-2242—2 T921A,B,E-G SPECIFICATIONS Fig. 1—T921 approximate installation dimen-sions in in. [mm]. SETTINGADJUSTMENT KNOB 1 1 M9107 3 [84] 5 16 5 [145] 1116 5 [137] 38 7 [194] 58 1 16 3 [78] 5 16 3 [84] 38 3 [86] 5 16 5 [135] 14 2 [57] FOR VERTICALCONDUIT BOX (2) HORIZONTAL CONDUIT BOX ACCESSORY A...
60-2242—2 4 T921A,B,E-G INSTALLATION Installation ! CAUTION Disconnect power supply before installation toprevent electrical shock and equipment damage. WHEN INSTALLING THIS PRODUCT… 1. Installer must be a trained, experienced service tech- nician. 2. All wiring must comply with applicable electrica...
