EWC Controls EWT-725 Installation Manual page 3

Wiring Diagrams
Power supply
Use either O or B terminals for changeover valve.
Optional 24 VAC common connection when thermostat is used in battery power mode.
Factory-supplied jumper
2H/1C Heat Pump System - Factory Default Setting
R
COMPRESSOR
Y
RELAY
C
W/E
G
FAN RELAY
W2
AUXILIARY
Typical 2H/1C Heat Pump System with separate emergency heat
R
COMPRESSOR
Y
RELAY
C
EMERGENCY
W/E
RELAY
G
FAN RELAY
W2
AUXILIARY
Conventional System 1H/1C, 2H/1C
R
Y
C
W/E
G
W2
HEAT RELAY 2
Tech Settings
Tech Settings
This feature will start heating and
cooling early to bring the building
Pro
temperature to its programmed
Recovery
setpoint by the begining of the
WAKE or RETURN time period.
You can configure this thermostat
to have 7 Day, 5+1+1 program-
Program
ming or non programmable.
Options
When set to ON this thermostat
will operate a heat pump system
(default). If set to OFF this
Heat Pump
thermostat will operate a
conventional system, and the next
tech step will not appear.
For Dual Fuel applications (Gas/
Dual Fuel
Fossil fuel Auxiliary Heat), turn this
Auxiliary
setting ON to LOCKOUT the Heat
Pump (Y) when Auxiliary Heat (W2)
for Heat
is on.
If desired- This can also be used
Pump
with Electric Auxiliary.
Will only
appear if
Heat pump
setting is
turned ON.
C
Note: In many systems
with no emergency heat
L2
relay a jumper can be
L1
(HOT)
used between E and W2.
R
COOL CHANGE
OVER VALVE
HEAT CHANGE
OVER VALVE
C
L2
L1
(HOT)
R
COOL CHANGE
OVER VALVE
HEAT CHANGE
OVER VALVE
(Heat pump set to "OFF" in tech settings)
C
L2
L1
(HOT)
R
COMPRESSOR
RELAY
HEAT RELAY
FAN RELAY
Adjustment Options
LCD Will Show
Use the and
ON or OFF.
Next Step
Prev Step
Use the and
lect 7d for 7 Day, 5d for 5+1+1,
Next Step
or 0d for non programmable.
Prev Step
ON - Configured to operate heat
pump system.
Next Step
OFF - Configured to operate
conventional system
See page 6 for terminal
designations.
Prev Step
OFF Will allow Y(1st stage of Heat)
and W2 (Aux Heat) to run together
Next Step
if called for.
ON Will de-energize Y terminal
45 seconds after a call for Auxiliary
Heat (W2).
Prev Step
Features & Private Label Badge
Temporary and Permanent Hold Feature
When cool or heat is turned on, the thermostat will display HOLD
and RUN SCHED on the left of your screen when you press the
or
Temporary Hold: At this time if you do nothing, the temperature will
remain at this setpoint temporarily until next time period.
Permanent Hold: If you press the HOLD key on the left of your
screen, you will see HOLD appear below the setpoint temperature in
the display. The thermostat will now permanently stay at this
setpoint and can be adjusted using the
To Return to Running Schedule: Press the RUN SCHED button on
the left of your screen to exit either temporary or permanent hold.
O
Filter Change Reminder
B
If your installing contractor has configured the thermostat to remind
you when the air filter needs to be changed, you will see FILT in the
display when your air filter needs to be changed.
Resetting the filter change reminder: When FILT reminder is
displayed, you should change your air filter and reset the reminder
by holding down the second button from the top left side of the
thermostat for 3 seconds.
About The Badge
O
All of our thermostats use the same universal magnetic badge. Visit the
B company website to learn more about our free private label program.
Note:
This
thermostat is only
compatible with
ONE transformer
systems.
Gently slide a screwdriver into the bottom edge of the
badge. Gently turn the screwdriver counter clockwise. The
badge is held on by a magnet in the well of the battery door.
The badge should pry off easily. DO NOT USE FORCE.
Tech Settings
Default Tech Settings
Select GAS for systems that
key to turn
control the fan during a call for
Fan
ON
heat. Select ELEC to have the
Operation
thermostat control the fan during a
call for heat.
key to se-
This feature controls the number of
Emergency
5d
stages in Emergency Heat mode. It
Heat
only appears if the Technician Setup
Step for HEAT PUMP is ON.
Stages
This feature allows the thermostat to
keep multiple stages of heat
ON Satisfy
energized until setpoint is satisfied.
Setpoint
This feature allows a delay to occur
when a second stage is needed.
This allows the previous stage extra
Staging
OFF
time to satisfy setpoint.
Delay
button.
LCD Will Show
Next Step
Prev Step
Next Step
Prev Step
Next Step
Prev Step
Next Step
Prev Step
(If using programming)
or keys.
Use the bevel on lower ridge
Magnet in door
Adjustment Options Default
EL - Electric for thermostat
control
EL
GS- Gas for system control
Use the or key to select
1-stage or 2-stage operation.
1
Use the or key to turn
ON or OFF.
OFF
Use the or key to
select OFF, 5, 10, 15, 30, 45, 60,
or 90 minutes.
OFF