Honeywell T6812DP08 User manual

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APH07CH04 - R2000EN
T6811/6812 Series LCD Digital Thermostat
110/120/220 VAC
2-pipe fan coil control
Application
T6811/6812 digital thermostats are designed for
application of 3-speed fan and valves in 2-pipe fan
coil system.
Including:
- 2-pipe cool only/heat only/manual
changeover between heat and cool
- Ventilation mode
- Manual 3-speed fan control
- Water valve control
In ventilation mode, fan only support manual speed
control.
Data sheet
Features
● Super modern appearance design, suitable for
office, hotel and residential building
● Independant installation on 86 size box directly
● Big LCD with English and icon display
● Easy to install and set-up
● Selectable room temperature or setpoint display
● Manual fan speed selection
● Adjustment of display room temperature
● Temperature unit either oC or oF
● User setting can be kept when power off
● Lock or unlock keys in Installer Set-up
● Heat and cool setpoint limitation for energy
saving
Model summary
Model 2-pipe/
4-pipe
Operating
voltage
(V)
Energy
saving Ventilation
Manual
/Automatic
fan
T6812DP08 2 220 N Y Y
T6811DP08 2 110 N Y Y

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APH07CH04 - R2000EN
Mechanical design
Thermostat appearnce
Function
Temperature display
The displayed temperature can be set to acquired room
temperature or setpoint. The setting can be made during
Installer Set-Up process.
Keypad lock
Keypad lock can be set in ISU with default status is all
keys available. You may change into all buttons locked
out.
Ventilation mode
Press mode button to enter ventilation mode. In
ventilation mode, no output for valve while the fan will
operate according to selected fan speed.
Technical specification
Power supply T6811DP08: 110(+20%,-10%)VAC
T6812DP08: 220(+/-10%)VAC
Frequency 50/60Hz
Input Current 4(2)A
Control algorithm PI, On/off output
Accuracy +/-1oC at 21oC
Rating capacity 220V: 4(2)A for fan load, 2(1)A for
zone valve;
110V: 4(2)A for fan load, 2(1)A for
zone valve
Cycle times 100,000
Setpoint range 10~32oC
Installation Installed on 86×86mm junction
box or US2×4 inch.
Protection Class IP20
Environmental Operation temperature -18~49oC
Conditions Shipping temperature -35~65oC
Relative humidity 5~90%
Action Type Action Type 1
Maximum 155oC
Temperature
for Relay Wiring
Terminal Designations
Terminal Description
LLine Voltage Power
Ch/Cc Heating close/Cooling close
W/Y Heating open/Cooling open
NLine Voltage Ground
Gl Low speed fan
Gm Medium speed fan
Gh High speed fan
DOWN BUTTON
FAN BUTTON
UP BUTTON
MODE BUTTON
POWER BUTTON
Wiring diagrams
Typical wiring for ON/OFF control in 2 pipes Heat/Cool/
1H1C (VC4013)
Typical wiring for ON/OFF control in 2 pipes Heat/Cool/
1H1C (VC6013)

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APH07CH04 - R2000EN
I. Place Back cover over junction box, insert and make
the mounting screws tightly.
II. Connect the wiring by order and make the mounting
screws tightly.
III. Align the top of thermostat with back cover and push
down on the back cover.
IV. Screw down the mounting screws on bottom of
thermostat.
Caution: Power module or thermostat can only be
replaced by manufacturer or authorized staff.
Switch off power before installation, repair!
Troubleshooting Tips
If… Then…
Heating system
does not turn on.
♦ Set the mode to Heat by pressing the
Mode button.
♦ Check that the heat temperature setting
is set above the room temperature and
“Heat On” shows solidly in the display.
♦ Wait five minutes for the heating system
to respond.
Cooling system
does not turn on.
♦ Set the mode to Cool by pressing the
Mode button.
♦ Check that the cool temperature setting
is set below the room temperature and
“Cool On” shows solidly in the display.
♦ Wait five minutes for the cooling system
to respond.
The fan doesn’t
work.
♦ Check whether the Fan mode is set to
Auto
♦ Check whether the heating or cooling
system works.
The Up or Down
button doesn’t
work.
♦ Check whether the keypad is locked or
not.
♦ Check whether the system is working in
Energy saving mode.
♦ Check whether the thermostat is off.
Dimension
86
126
Wiring & Thermostat installation

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APH07CH04 - R2000EN
Setup Function Settings & Options
No. Description Possible Options
1System type
0 Heat only
1 Cool only
2 Two pipes 1H1C manual (Default)
9Temperature scale 0oF
1oC (Default)
13 CPH value For Heat
1
2
3
4 (Default)
5
6
7
8
9
10
11
12
14 CPH value For Cool
1
2
3(Default)
4
5
6
18
Display
Temperature
adjustment
-2oC (-4oF)
-1.5oC (-3oF)
-1oC (-2oF)
-0.5oC (-1oF)
0oC (0oF)(Default)
0.5 oC (1oF)
1oC (2oF)
1.5oC (3oF)
2oC (4 oF)
19 Temperature
Display mode
0 Display Room Temperature
(Default)
1 Display Setpoint
20 Heating Range
Stops 10-32oC Default 32oC
21 Cooling Range
Stops 10-32oC Default 10oC
22 Keypad Lockout 0 All keys available (Default)
1 All keys Locked out
Installer setup
Press and hold UP and MODE buttons 3 seconds to enter
setup mode
●
Press UP or DOWN button to change settings Press
MODE button to
● advance to next function
●
Press and hold UP and MODE buttons 3 seconds to
exit and save settings
Number
Setting