Honeywell CHRONOTHERM T8624C User Manual page 10

T8624C,D
INSTALLATION
Fig. 9—Cycle rate adjustment.
SYSTEM
1A 1B
OUT 1/2 OUT 1/2
GRAVITY
AIR/WATER TO 1 TURN TO 1 TURN
HOT OUT 1/2
IN
WATER TO 1 TURN
IN IN
GAS/OIL
(FACTORY SETTING)
WARM AIR
ELECTRIC
OUT 1/2
IN
WARM AIR TO 1 TURN
1 SCREWS 2A, 2B AVAILABLE ON SOME MODELS ONLY.
pear when thermostat is mounted back on the subbase.
IMPORTANT: For proper thermostat operation, al-
ways replace dead batteries with new alkaline
batteries. We recommend Energizer® batteries.
If batteries are completely dead, the display will go
blank when the thermostat is removed from the subbase.
Fig. 10—Battery placement.
POWER OUTAGES
Backup batteries will hold the programming and keep
the display on during most power outages. Once the
power is restored, the system will resume normal opera-
tion.
1A 1B
1
2A 2B
CYCLES
TIME/TEMP
2A
PER HOUR
DISPLAY
1
IN
24 HR
OUT 1/2
3
12 HR
TO 1 TURN
6 o
C
o
9
F
After replacing the batteries, reprogramming will be nec-
essary.
2B
If the display goes off when power is lost, either the
IN
backup batteries need to be replaced or are not installed.
OUT 1/2
When power is restored, the display will flash 1:00 PM
TO 1 TURN
as a reminder to reprogram.
M311A
MOUNTING THE THERMOSTAT
With system switch set to OFF, hang the thermostat
on the tabs at the top of the subbase (Fig. 11A). Swing
down and press on lower edge until thermostat snaps in
place (Fig. 11B). Open cover and tighten the captive
mounting screws (Fig. 11C).
SETTING DAY AND TIME
Restore 24V power to the thermostat. When power is
applied to the thermostat, the display will read 1:00 PM
and room temperature. It will go off for a few seconds,
then begin to flash on and off. Set present day and time.
Press
Press
the DAY key advances the display one day.
Press TIME
If the display will not come on:
— Check the mounting of the thermostat to the sub-
base. If loose or misaligned, remove thermostat
and reinstall on the subbase, making sure it is
firmly attached.
— Check to see that heat or cool system power is on.
— Check voltage between R and C; it should be 24 to
30 Vac.
10
BATTERY PLACEMENT
(NOTE CORRECT PLUS
AND MINUS DIRECTION)
SET
.
PRESENT
DAY/TIME
to set the current day. Each press of
DAY
BACK
or
AHEAD
M 372A
to set the current time.