The T8624D Chronotherm® IV Deluxe ZoneMultistage
Thermostat provides electronic control of 24 Vac
multistage zoned heating and cooling system. Refer to
Zone 1 on MABS II or
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.
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause a
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
3. Installer must be a trained, experienced service
4. After completing installation, use these instructions
to check out the product operation.
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Copyright © 1997 Honeywell Inc. •
Table 1. Description of T8624 Thermostats.
Requires common wire
to power supply
• All Rights Reserved
Table 1 for a general description of the thermostat.
The T8624 thermostat requires a common wire to
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.
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.