EWC Controls EWT-3611 Technical Bulletin page 4

OPERATION
This thermostat will operate on a full 24vac (R&C) power supply. If
desired, one battery (AA) may be used as a backup power supply
in the event of a power failure. If a full 24vac is not available, then
use one AA battery as the primary power supply.
Start-up
The LCD will show the factory default display of 70°F (21°C)
when the battery is first installed. The temperature will update
after a few seconds.
System Selector Switch
system
The System Selector Switch on the front of the
thermostat determines the operating mode of
cool off
heat
the thermostat. You may select COOL, OFF or HEAT. NOTE:
Anytime you install or remove the thermostat from the wallplate,
slide the System Selector to the OFF position.
Fan Switch
fan
The Fan Switch should normally be located in the
AUTO position. The fan will be turned on along
on auto
with normal operation of your system. In a normal gas or oil
furnace, the fan will be turned on by the furnace after its warm-up
delay. For electric heat, air conditioning, and heat pump operation,
the fan will turn on with the system. To run the fan continuously,
slide the fan switch to the ON position.
Review Current Set-Point Temperature
Press either the up or down key once to see the set-point
temperature. The factory default is 68°F (20°C) with the System
Switch in HEAT, and 78°F (26°C) with the System Switch in
COOL.
Setting New Set-Point Temperature
Press either or
temperature.
Press either or
point temperature. Hold the key down for over 2 seconds to fast
advance the set-point temperature.
Auto Shut Off
Your thermostat will automatically shut off in HEAT mode if the
room temperature rises above 95°F (35°C). It will shut off in COOL
mode if the room temperature drops below 45°F (7°C).
Note that if your system has malfunctioned and no longer
responds to thermostat controls, the Auto shut off will have no
effect.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
4
once and display the set-point
again to change your desired set-
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Filter Monitor
Your thermostat also keeps a record of the number of hours
your filter has been in use. To maximize your system
performance and energy efficiency, change or clean your filter
regularly.
When the total fan time reaches 400 hours, you need to clean or
change your system filter, "FILTER" will flash continuously until
the counter is reset to zero.
Press the center button to review filter usage. "FILTER"
displays with the total number usage in hours.
To reset the Filter Monitor counter, press and hold the
center button for 3 seconds when the filter monitor day shows.
Backlighting
Your thermostat has an electro-luminescent lamp that backlights
the display for easy viewing in the dark.
When any key is pressed, the display is illuminated.
The display will remain illuminated for 5 seconds after the last key
is pressed.
NOTE: If the thermostat is in a Low battery warning condition, the
backlight will not operate. Replace with 1 new AA alkaline battery
to restore the backlight function.
Troubleshooting
PROBLEM
No display
or
Dim Display
Fan does not Check HG/HE Switch for correct position
operate properly
Heating or Wait and see if 4 min. time dalay is activated
Cooling does not Check "System Switch" for correct position
operate properly
Thermostat
permanently reads
HI, LO, E1 or E2.
SOLUTION
Check power to thermostat
24vac and/or battery
Check Wiring
Thermostat is faulty
Replace Thermostat
E-Mail- info@ewccontrols.com