EWC Controls EWT-725 Installation Manual page 2

Thermostat Quick Reference
Getting to know your thermostat
Sun Mon Tue Wed Thu Fri Sat
Tech Set
Next Step
Set Time
Run Sched
Set Sched
Hold
Prev Step
Menu
LEAVE
Done
1
Indicates the current room temperature
2 Time and day of the week
3 Low Battery Indicator: Replace batteries when this indicator is shown.
Button Options
Program Time Periods: This thermostat has 4 programmable time periods
per day.
System Operation Indicators:
The COOL ON, HEAT ON or icon will display when the COOL, HEAT, or
Note: The Compressor delay feature is active if these are flashing.
7 Hold is displayed when the thermostat program is permanently overridden.
8
Setpoint: Displays the user selectable setpoint temperature.
Stages: Indicates the stages of heat that are active.
Important
The low battery indicator is displayed when the AA battery power is low. If the user
fails to replace the battery within 21 days, the screen will only show the low battery
indicator but maintain all functionality. If the user fails to replace the batteries after
an additional 21 days (days 22-42 since first "low battery" display) the setpoints will
change to 55˚F (Heating) and 85˚F (Cooling). If the user adjusts the setpoint away from
either of these, it will hold for 4 hours then return to either 55˚F or 85˚F. After day 63
the batteries must be replaced immediately to avoid freezing or overheating because
the thermostat will shut the unit off until the batteries are changed.
Tech Settings
Technician Setup Menu
This thermostat has a technician setup menu for easy installer
configuration. To setup the thermostat for your particular application:
1. Press the MENU button
2. Press and hold TECH SET button for 3 seconds. This 3 second
delay is designed so that homeowners do not accidentally access
the installer settings.
3. Configure the installer options as desired using the table below.
Use the or keys to change settings and the NEXT STEP or
PREV STEP key to move from one step to another. Note: Only press
the DONE key when you want to exit the Technician Setup options.
Tech Settings
This feature will flash "FILT" in the
display after the elapsed run time
to remind the user to change the
Filter Change
filter. A setting of "OFF" will disable
Reminder
this feature.
This feature allows the installer
to change the calibration of the
Room
room temperature display. For
Temperature
example, if the thermostat reads
Calibration
70˚ degrees and you would like it
to read 72˚ then select +2.
The compressor short cycle delay
protects the compressor from
Compressor
short cycling. This feature will not
Short Cycle
allow the compressor to be turned
Delay
on for 5 minutes after it was last
turned off.
Swing Setting Tip
Temperature swing, sometimes called differential or cycle rate, can be customized
for this individual application. For most applications choose a swing setting that is
as long as possible without making the occupants uncomfortable.
2
8
Temperature
Hold
1
3
LOW
COOL ON
HEAT ON
SLEEP
Em
RETURN WAKE Stage 1 & 2
LCD Will Show Adjustment Options
You can adjust the filter change
SE
100
reminder from OFF to 2000
Next Step
hours of runtime in 50 hour
F 1
increments.Tap the second
button from the top left side of
the thermostat to display the
Prev Step
current filter elapsed runtime.
You can adjust the room
CAL
temperature display to read
Next Step
4˚above or below the factory
0
calibrated reading.
Prev Step
Selecting "ON" will not allow
Cd
the compressor to be turned on
Next Step
for 5 minutes after the last time
the compressor was switched
off. Select "OFF" to remove this
delay.
Prev Step
Wiring
Caution:
Electrical Hazard
Failure to disconnect the power
before beginning to install this
product can cause electrical
shock or equipment damage.
7
Wiring
1.
If you are replacing a thermostat,
make note of the terminal
connections on the thermostat
that is being replaced. In some
cases the wiring connections will
not be color coded. For example,
the green wire may not be
connected to the G terminal.
2.
Loosen the terminal block
screws. Insert wires then
retighten terminal block screws.
3.
Place nonflammable insulation
into wall opening to prevent
drafts.
Terminal Designations
(fan) is on.
Heat Pump System
1 HEAT 1 COOL / 2 HEAT 1 COOL
R
C
B
O
G
W/E
First Stage of Emergency HEAT
W2
Y
First Stage of HEAT and COOL
Tech Settings
Tech Settings
The swing setting often called
"cycle rate", "differential" or "
anticipation" is adjustable. A
Cooling
smaller swing setting will cause
more frequent cycles and a larger
Swing
swing setting will cause fewer
cycles.
The swing setting often called "cycle
rate", "differential" or "anticipation"
is adjustable. A smaller swing
Heating
setting will cause more frequent
cycles and a larger swing setting
Swing
will cause fewer cycles.
Default
This feature allows you to set a
maximum heat setpoint value. The
Heating
setpoint temperature cannot be
Setpoint
raised above this value.
0FF
Limit
This feature allows you to set a
minimum cool setpoint value. The
Cooling
setpoint temperature cannot be
Setpoint
lowered below this value.
Limit
0
Select F for Fahenheit temperature
read out or select C for Celsius
read out.
F or C
0N
You can select either a 12 or 24 hour
clock setting.
12 or 24
Hour Clock
Transformer Power
Transformer Common
Changeover Valve
Energized in HEAT
Changeover Valve
Energized in COOL
Fan Relay
Second Stage of HEAT/
EMERGENCY HEAT
LCD Will Show
Next Step
Prev Step
dFHE
Next Step
Prev Step
HE L
Next Step
Prev Step
CO L
Next Step
Prev Step
Next Step
F
Prev Step
Next Step
Prev Step
Warning:
All components of the
control system and the
thermostat installation must
conform to Class II circuits
per the NEC Code.
Installation Tip
Do not overtighten terminal
block screws, as this can
damage the terminal block.
A damaged terminal block
can keep the thermostat
from fitting on the subbase
correctly or cause system
operation issues.
Max Torque = 6in-lbs.
Conventional System
1 HEAT 1 COOL / 2 HEAT 1 COOL
Transformer Power
Transformer Common
Energized in HEAT
Energized in COOL
Fan Relay
First Stage of HEAT
Second Stage of HEAT
First Stage of COOL
Adjustment Options Default
The cooling swing setting is
adjustable from 0.2˚ to 2˚. For
example: A swing setting of
0.8
0.5˚ will turn the cooling on at
approximately 0.5˚ above the
setpoint and turn the cooling
off at approximately 0.5˚ below
the setpoint.
The heating swing setting is
adjustable from 0.2˚ to 2˚. For
example: A swing setting of
0.5˚ will turn the heating on at 0.8
approximately 0.5˚ below the
setpoint and turn the heating
off at approximately 0.5˚ above
the setpoint.
Use the and key to
select the maximum heat
setpoint.
90
Use the and key to
select the minimum cool
setpoint.
44
F for Fahrenheit
FC
F
C for Celsius
Use the and to select 12
or 24 hour clock.
12