Honeywell T921B - Manual
Honeywell T921B – Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
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...
