3
1.1 - Product range
2ET04700224
This thermostat may be used with the following units:
- All DCE (with or without electrical heaters) and DIG roof top
units.
2ET04700324
This thermostat may be used with the following units :
- BCH 036 / 060 (with or without electrical heaters).
2ET04700424
This thermostat may be used with the following units :
- BCH 090 / 120 and BIH 180 / 240 (with or without electrical
heaters).
Technical data
1.2 - General features
• One model can be used for single-stage and multistage appli-
cations.
• Day programming : two occupied/unoccupied periods per day.
• Individual temperature setpoints for:
- Occupied heat and cool.
- Unoccupied heat and cool.
• Proportional plus integral control eliminates temperature fluc-
tuations and thermostat tampering.
• Intelligent Recovery : automatically optimises start time depen-
ding on building load.
• Intelligent Fan energizes fan on call for heating or cooling only.
Fan can be configured to run continuously in occupied mode.
• Automatic heat/cool changeover.
• Locking setpoints and schedules eliminate tampering (user
keyboard security).
• One thermostat can be used for heat pump or conventional
control.
• Optional remote sensors.
• Convenient overrides allow temporary changes.
1.3 - Dimensions
1.4 - Recovery from unoccupied
Intelligent Recovery
TM
is a Honeywell trademark for the way the
thermostat controls the heating and cooling equipment during
recovery from unoccupied to occupied setting. During recovery,
the control point ramps up at the rate of 3
°
C per hour rather than
jumping from the energy savings setting to the comfort setting all
at once. This provides additional energy savings.
When the Intelligent Recovery
TM
is used in the heating mode the
control point raises 3
°
C per hour (2
°
C for the heat pump), maxi-
mizing the use of the more economical first stage heat to bring
the sensed temperature to the desired comfort setpoint. This
minimizes using the typically more expensive second stage heat.
The advantages are:
- Comfort setting is achieved at the programmed time and main-
tained regardless of weather conditions; occupants are com-
fortable.
- Drafts from low temperature discharge air are minimized during
occupied periods.
- The thermostat automatically uses the more economical first
stage of heat as the primary heat source during heat mode
recovery, avoiding the use of the expensive second stage
heating.
- Comfort and energy savings can be achieved in both heating
and cooling.
- The thermostat reduces heat cycling, extending equipment life.
1 - Specifications
3
Description
Values
Rated Voltage
24-30 Vac, 50/60 Hz
Rated A.C Current
1,6 Amps continuous per output
with surges to 3,5 Amp Max.
Control Range
7 to 35
°
C; 1
°
C Steps
Thermostat
Measurement range
4 to 43
°
C
Control Accuracy
±
0,5
°
C at 20
°
C
Minimum deadband
Between heating and cooling : 1
°
C
Clock accuracy
+/- 1 minute per month
Default setpoint
20
°
C during occupied period
heating
13
°
C during unoccupied period
Default setpoint
26
°
C during occupied period
cooling
32
°
C during unoccupied period
Anti recycle time
2 min ON / 4 min OFF
Battery backup
Up to 60 hours with fresh 9 Volts
alkaline battery
FAN
AUTO ON
EM HEAT HEAT OFF COOL
EM HEAT AUX HEAT
204
102
118
41
