Honeywell 511 Manual

1 68-0134
C.H.  •  9-93  •  ©Honeywell Inc. 1993  •  Form Number 68-0134
The T8624C,D Chronotherm III Program-
mable Fuel Saver Thermostats provide auto-
matic control of multistage heating/cooling sys-
tems and offer users the highest standard of
comfort and convenience available with energy
savings.

Different schedules may be selected for week-
days, Saturday and Sunday.

Can be programmed in hand (with batteries in-
stalled) or on wall to provide up to four tempera-
ture settings per day.

Large...

2 T8624C,D
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. 3. System, fan switching desired.
2. Number of heat and cool stages desired. 4. Application.
If you have additional questions, need further information or would like to comment on our products or services, please write or...

3 68-0134
T8624C,D
SPECIFICATIONS
Fig. 1—T8624 Subbase mounting dimensions in in. [mm].
4    [121]3
4
3     [83]5
16
7 [179]
1     
[46]13
16
5     
[135]5
16
M5181A
43
32
[104]
131
32
[50]
Fig. 2—Typical thermostat keypad.
SYSTEM
RUN
PROGRAM
WAKETIMETEMPERATURE
PRESENT
SETTING
SKIP
NEXT
PERIOD
CHANGE
TO LAST
PERIOD SET
PRESENT
DAY/TIME
HOLD
TEMP
DAY
SET
HEAT/COOLSLEEPLEAVE
AHEADWARMER
BACK COOLER
M2998
WED
LEAVE
AM
HEAT ON
HEAT AUTOCOOLON AUTOFAN
ROOM
RETURN
OFF
PERIOD 

4 T8624C,D
SELECTION/APPLICATION
Selection/Application
The T8624 Thermostat uses the latest microelec-
tronic design and control technology to provide home
and building owners with the highest level of comfort
available and optimal energy savings in a package that is
easy to use and easy to live with.
The following section is a guide to selection and
application of the best thermostat to meet individual
needs.
PROGRAMMING
Does the thermostat selected accommodate the
customer’s daily schedule, lifestyle...

5 68-0134
Installation
T8624C,D
INSTALLATION
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 author-
ity for instructions regarding recycling and the proper
disposal of your old control.
If you have any questions, call Honeywell Inc. at 1-
800-468-1502.
COMPATIBILITY
The T8624 Thermostats will replace most heating/
cooling system thermostats. As long as ac power is
continuously...

6 T8624C,D
INSTALLATION
Fig. 4—Mounting subbase on wall.
WIRES THROUGH
WALL OPENINGWALL 
WALL
ANCHORS
(2)
SUBBASEMOUNTING
HOLES
MOUNTING
SCREWS (2)
M846
Fig. 5—Restrict wiring to recessed area
surrounding terminals.
FOR STRAIGHT
INSERTION –
STRIP 5/16 in. [8 mm]
FOR WRAPAROUND –
STRIP 7/16 in. [11 mm]
RESTRICT
WIRING TO
THIS AREA  
WIRING TO BE BELOW
THIS SURFACETOP SURFACE
OF SUBBASE
FRONT VIEW OF
TERMINAL AREA
CROSS-SECTIONAL VIEW OF
TERMINAL AREA
M 847
WIRING
All wiring must comply with local...

7 68-0134T8624C,D
INSTALLATION
Fig. 6—T8624C 2-stage heat/1-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON
fan switching.
NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C FOR 
THERMOSTAT OPERATION.
DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION.
M5233
HEATING
TRANSFORMER
R
C
W1
W2
HEAT RELAY 1
HEAT RELAY 2
COOLING
TRANSFORMER
Y1
G
RC
COOLING
CONTACTOR
FAN RELAY
HEAT 1
HIGH
LIMIT
HIGH
LIMIT
L1
(HOT)
L2
HEAT
AUTO
OFF SYSTEM
SWITCH
AUTO
ON FAN
SWITCH
COOL
HEAT 2
2
1
COOL
L1
(HOT)
L2
12...

8 T8624C,D
INSTALLATION
DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION.M3765
HEATING
TRANSFORMER R
C
W1
W2HEAT RELAY 1
HEAT RELAY 2
COOLING
TRANSFORMER Y2
Y1
G
RCCOOLING
CONTACTOR 1 COOLING 
CONTACTOR 2
FAN RELAY HIGH
LIMIT
HIGH
LIMIT
HEAT
AUTO
OFFSYSTEM
SWITCH
AUTO
ON FAN
SWITCH
COOLHEAT 2
COOL 2
COOL 1
SUBBASE 
LOGIC/ 
CONTROL 
CIRCUIT
POWER SUPPLY.  PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED.
FOR SINGLE TRANSFORMER SYSTEM, JUMPER R AND RC.
NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN...

9 68-0134T8624C,D
INSTALLATION
Fig. 8—T8624D 2-stage heat/2-stage cool thermostat with HEAT-OFF-COOL system and AUTO-ON fan
switching; auto fan on heat and cool; convertible to auto fan on cool only.
FOR ELECTRIC HEAT APPLICATIONS (AUTO FAN OPERATES WITH W1
AND Y1), USE ONLY ONE TRANSFORMER; JUMPER R AND RC.  SET
 SWITCH TO ELECTRIC POSITION.
  
NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C FOR 
THERMOSTAT OPERATION.
DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION.
M1016D
HEATING
TRANSFORMER
R
C
W1...

10 T8624C,D
INSTALLATION
Fig. 9—Cycle rate adjustment.
SYSTEM
GRAVITY
AIR/WATER
HOT
WATER
GAS/OIL
WARM AIR
ELECTRIC
WARM AIR1A
OUT 1/2 
TO 1 TURNOUT 1/2 
TO 1 TURN
OUT 1/2 
TO 1 TURN
OUT 1/2 
TO 1 TURN1B
ININ
(FACTORY SETTING)IN INTIME/TEMP
DISPLAY2A2B
24 HRIN
12 HR
o
oC
F
OUT 1/2 
TO 1 TURN
OUT 1/2 
TO 1 TURNIN
M311A1    SCREWS 2A, 2B AVAILABLE ON SOME MODELS ONLY.
1A
2A 2B1B1
CYCLES
PER HOUR
1
3
6
9
pear when thermostat is mounted back on the subbase.
IMPORTANT: For proper thermostat operation, al-...