5.5.1 Automatic changeover
In automatic changeover, the thermostat detects when the system switches between heat mode and cool mode by comparing the air supply temperature with the ambient temperature. If the thermostat is in heat mode, it switches to cool mode when the air supply is cooler than ambient by 9°F (5°C) or more. If it is in cool mode, it switches to heat mode when the air supply is warmer than ambient by 9°F (5°C) or more.
Note: Neither the heat mode icon (
) nor cool mode icon ( 
) appears when the thermostat is placed in automatic changeover.
5.5.2 Changeover Input
The thermostat is in the default mode when the contact between ter- minals 9 and 11 is open and switches mode when the contact is closed. The default mode is set via the configuration menu.
Note: The changeover contact state is ignored if the thermostat is configured in automatic changeover or in limited cooling.
5.6 Night Setback
The Night Setback (NSB) mode is activated when the contact between terminals 9 and 12 is closed. When the thermostat is in the NSB mode, indicated by the ECONO display, the temperature is lowered or raised by the set NSB value depending whether the thermostat is in heat
mode or cool mode respectively. The NSB value is set via the con- figuration menu.
Night Setback Override
To temporarily override the NSB mode, press the Over- ride button. The NSB mode is lifted for the next 2 hours or until the Override button is pressed again. During the override, the normal setpoint is used and OVERRIDE is displayed.
5.7 Error Codes
The following error codes can appear at the top of the display.
E1: The internal temperature sensor is defective
E2: The internal temperature sensor is shorted
E3: The external temperature sensor is defective or not connected
E4: The external temperature sensor is shorted
6. Technical Specifications
Power: 24 VAC
Current consumption: 25 mA
Output signals: Depends on output configurations
Output ratings:
-Triac output: 0.5 A maximum @ 24 VAC
-Analog output (SCR connection): 0 - 10 V, 10kΩ minimum
-Analog output (SSR connection): 0 - 10 V, 45 mA maximum Setpoint range: 50°F to 95°F (10°C to 35°C)
Temperature display: 32°F to 140°F(0°C to 60°C)
Temperature display resolution: 1°F (0.5°C)
Mode hysteresis: 4°F (2°C)
Automatic changeover deadband: 9°F (5°C)
Duty cycle: Depends on output configurations
NSB offset: Programmable 2°F to 18°F (1°C to 9°C)
NSB override period: 2 hours
Memory protection: Configuration and setpoint
Temperature control: Proportional integral adaptive (P.I.A.)
Operating temperature: 32°F to 140°F (0°C to 60°C)
Storage temperature: -4°F to 122°F (-20°C to 50°C)
Humidity limits: 0 to 95% R.H., non-condensing
Dimensions: 2.7 x 4.6 x 1.0 in. (69 x 118 x 27 mm)
Accessories: - R841 electromechanical relay
-50014157-001 air duct temperature sensor
-50014156-002 remote room temperature sensor
Compatible Damper/Valve actuators: VC6930, VC6934, VC6936 VC7930, VC7934, VC7936 ML6984
ML7984 ML6410, ML7410 ML6161B2024, MN6105A1011 ML7161A2008, MN7505A2001
Wiring: 18 AWG (1 mm2) wire
Mounting: - directly to drywall
-single-gang NEMA standard 2-in x 4-in electrical box
-double-gang NEMA standard electrical box with mounting plate
7.Warranty
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of two (2) years from the date of purchase by the consumer. If at any time dur- ing the warranty period the product is determined to be defective or malfunc- tions, Honeywell shall repair or replace it (at Honeywell's option).
If the product is defective,
(i)return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it, or
(ii)call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the
following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885 Douglas Dr N, Golden Valley, MN 55422, or whether a replacement product can be sent to you.
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.
Honeywell's sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDI- RECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WAR- RANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE TWO-YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.
If you have any questions concerning this warranty, please write Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.
8. Customer Assistance
If you have any questions regarding your thermostat, please go to http://customer.honeywell.com, or call Honeywell technical hot-
line at 1-888-245-1051.
