Honeywell T8424C- User Manual
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Table of Contents:
- Page 3 – INSTALLATION; When Installing this Product...; CAUTION; Disconnect power supply before beginning wiring; MERCURY NOTICE; UP
- Page 4 – Location; cover plate and wallplate to wall.
- Page 5 – Wiring
- Page 6 – in single transformer system with
- Page 7 – directly to vent damper in hydronic intermittent pilot system.
- Page 8 – Mounting Thermostat to Wallplate; SETTINGS AND ADJUSTMENTS; Setting Fan and System Switches; display and system switches.; Fan Switch
- Page 9 – System Switch; Set Temperature Setpoint; Setting °F/°C Indication and Heat Cycle Rate; Optional System Checkout
- Page 10 – OPERATION; Zero Droop Performance; System
- Page 11 – Energy Savings; Sequence of Operations
- Page 12 – Fan Control; Heat Mode; CHECKOUT; Heating; Fan
- Page 13 – TROUBLESHOOTING
PRODUCT DATA
® U.S. Registered Trademark
Copyright © 2001 Honeywell • All Rights Reserved
68- 0180- 3
T8400C, T8401C and T8424C,D
Electronic Thermostats
APPLICATION
The T8400C and T8401C Standard Electronic Thermostats
provide single-stage, non-programmable temperature control
for 24V heating-cooling systems with manual changeover
from heat to cool.
The T8424C Electronic Multistage Thermostat provides two-
stage heat and one-stage cool control.
The T8424D Electronic Multistage Thermostat provides two-
stage heat and two-stage cool control.
FEATURES
• Attractive styling complements any decor to the
homeowner’s delight.
• Ease-of-use means fewer homeowner questions and
increased homeowner satisfaction.
• Large display for quick easy readability.
• Conveniently sized 3-1/2 x 3-1/2 thermostat with
optional decorator cover plates (3-7/8 in. x 3-7/8 in. and
5-3/4 in. x 5-3/4 in.) makes it easy to install in a variety
of locations.
• Keys are located for easy access.
• Fan and system switches are located on the lower
edge to eliminate accidental setting changes.
• Easy installation, setup and self-test saves time and
increases installer productivity.
• Manual changeover from heat to cool eliminates
unexpected system operation.
• °F or °C temperature display for added model
flexibility.
• Selectable heating cycle rate (1, 3, 4, 5, 6 or 9, 12 cph)
for a variety of applications which reduces the amount
of inventory.
• Cooling cycle rate is fixed (3 cph), the standard setting
for compressors, for speedy installation.
• Setpoints are permanently held in memory (no
batteries used) and retained during power outages for
increased installer and homeowner convenience.
• Power stealing and hard wired models available for
virtually all equipment and application needs including
gravity or radiating systems, hydronic heat,
condensing gas furnaces, gas or oil forced air and
electric heat.
T8400C and
T8401C
T8424C,D
Contents
Application ........................................................................
1
Features ...........................................................................
1
Specifications ...................................................................
2
Ordering Information ........................................................
2
Installation ........................................................................
3
Settings and Adjustments .................................................
8
Operation .......................................................................... 10
Checkout .......................................................................... 12
Troubleshooting ................................................................ 13
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Summary
T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS 3 68-0180-3 Fig. 1. T8400/T8401 Thermostat dimensions in in. (mm). Fig. 2. T8424 Thermostat dimensions in in. (mm). INSTALLATION When Installing this Product… 1. Read these instructions carefully. Failure to follow them could damage the product or c...
T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS 68-0180-3 4 Location Install the thermostat about 5 ft (1.5m ) above the floor in an area with good air circulation at average temperature. See Fig. 3. Do not install the thermostat where it can be affected by:— drafts or dead spots behind doors and...
T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS 5 68-0180-3 Fig. 5. Mounting the T8424 wallplate to wall. Wiring IMPORTANT Use an 18-gauge maximum wire for wiring the ther- mostats. All wiring must comply with local electrical codes and ordinances. Disconnect the power supply to prevent electrica...
