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Honeywell CHRONOTERM IV T8624D Installation Instructions Manual

Deluxe zone multistage thermostat
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APPLICATION
The T8624D Chronotherm® IV Deluxe ZoneMultistage
Thermostat provides electronic control of 24 Vac
multistage zoned heating and cooling system. Refer to
Model
Application
T8624D
Zone 1 on MABS II or
TotalZone® system
RECYCLING NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old thermostat.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. •
T8624D Chronotherm
Table 1. Description of T8624 Thermostats.
Powering Method
Requires common wire
to power supply
• All Rights Reserved
Multistage Thermostat
INSTALLATION INSTRUCTIONS
Table 1 for a general description of the thermostat.
The T8624 thermostat requires a common wire to
supply power.
Changeover
System Selection
Automatic or
Heat-Off-Cool-Auto
manual
Location
Install the thermostat about 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1.
Do not install the thermostat where it can be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Wallplate Installation
The thermostat can be mounted horizontally on the wall or
on a 2 in. x 4 in. wiring box. Position wallplate horizontally
on the wall or on a 2 in. x 4 in. wiring box.
Position and level the wallplate (for appearance
only). The thermostat will function properly even
when not level.
X-XX UL
®
Deluxe Zone
Fan Selection
On-Auto
69-1074
IV

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  Summary of Contents for Honeywell CHRONOTERM IV T8624D

  • Page 1 4. After completing installation, use these instructions to check out the product operation. ®U.S. Registered Trademark Copyright © 1997 Honeywell Inc. • T8624D Chronotherm Multistage Thermostat Table 1 for a general description of the thermostat. The T8624 thermostat requires a common wire to supply power.
  • Page 2 Push excess wire back into the hole. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. CAUTION Disconnect power before wiring to prevent electrical shock or equipment damage. Use 18 gauge, color-coded thermostat cable for proper wiring. M10106...
  • Page 3: Mounting Thermostat

    W1 W2 ZONE 1 NOTE: WHEN USING W2 ON THE THERMOSTAT TO CONTROL THE SECOND STAGE OF HEATING, MAKE SURE THE STAGE JUMPER IS IN PLACE, ON THE TZ PANEL Fig. 3. Typical wiring diagram for T8624 on zone 1 TotalZone®...
  • Page 4: System And Fan Settings

    See Fig. 8. The fan settings can be set for each program period individually. The system selection is for all the program periods. System settings control the thermostat operation as follows: Heat: The thermostat controls the heating. Off: Both the heating and cooling are off.
  • Page 5: Installer Setup

    Table 2 and if no changes are necessary, go to the Installer Self-Test section. The Installer Setup is used to customize the thermostat to specific systems. Some of the options include temperature display, changeover and outdoor temperature display.
  • Page 6 (models with OT terminals) Not used 25 thru 32 The cycle rate for the second stage of heat is adjustable with 6 cph being the factory setting. 69-1074 Table 3. Thermostat Installer Setup Options. Factory-Setting Display Description — — Stage 2 —...
  • Page 7: Setting Current Day And Time

    T8624D CHRONOTHERM Table 3. Thermostat Installer Setup Options (Continued). Installer Setup Number (Press Time key to change) Select Minimum off time for the compressor Temperature range stops in heating Temperature range stops in cooling Not used Temperature display adjustment IMPORTANT Review the settings to confirm that they match the system.
  • Page 8: Installer Self-Test

    Settings Daylight Copy Time INSTALLER SELF-TEST Use the Installer Self-Test to check the thermostat operation. Refer to Table 4 for a list of the available self- tests. To start the self-test: CAUTION The minimum off time for compressors is bypassed during the Installer Self-Test.
  • Page 9 The Run Program Key will not exit this test. Press Time Program Key to exit. ® IV DELUXE ZONE MULTISTAGE THERMOSTAT Table 5. Installer Self-Test Options. Description to go to the previous test and Time...
  • Page 10: Thermostat Information

    — If 24 Vac is present, proceed with troubleshooting. Verify that thermostat is correctly positioned and securely latched to wallplate. Enter Installer Setup number 37 and reconfigure the display. Enter Installer Setup number 14 and reconfigure the display.
  • Page 11 Check cooling setpoint. Set cooling setpoint to desired temperature. Verify operation of heating or cooling equipment in self-test. Enter Installer Setup number 24 and set to 1. Thermostat must have OT terminals and a C7089B1000 installed. Refer to C7089B1000 installation instructions and check wiring between the thermostat and sensor.
  • Page 12 ® T8624D CHRONOTHERM IV DELUXE ZONE MULTISTAGE THERMOSTAT 57 Bushes Lane Elmwood Park, NJ 07407-3204 69-1074 69-1074 J.H. 3-97 Printed in Taiwan R.O.C. www.honeywell.com/yourhome...