Technician Setup Menu - EWC Controls EWT-755WHO Installation Manual

Wiring
Note: This thermostat is
hardwire powered when the
24V transformer is
connected to the R and C
terminals of the thermostat.
Typical Cool-Only System With Fan
RC
RH
COMPRESSOR
Y
RELAY
C
W/E
G
FAN RELAY
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Technician Setup
This thermostat has a technician setup menu for easy installer
configuration. To set up the thermostat for your particular application:
1. Press the MENU button.
2. Press and hold the technician setup 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 PREVIOUS step key to move from one step to another.
Note: Only press the DONE key when you want to exit the
Technician Setup options.
4. Press the DONE key to exit.
Tech Setup Steps
This feature will flash a reminder
after the elapsed run time to
Filter Change
remind the user to change the
Reminder
filter. A setting of "OFF" will
disable 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˚ and you would like it to read
72˚ then select +2.
The swing setting often called
"cycle rate", "differential" or
"anticipation" is adjustable. A
smaller swing setting will cause
Cooling
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
Heating
smaller swing setting will cause
more frequent cycles and a larger
Swing
swing setting will cause fewer
cycles.
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Note: In many systems
with no emergency heat
relay a jumper can be
used between W1 and W2.
R
L1
(HOT)
L2
C
Typical Heat Only System With Fan
RC
RH
Y
C
W/E
HEAT RELAY
G
FAN RELAY
LCD Will Show Adjustment Options
You can adjust the filter
change reminder from "OFF"
to 2000 hours of fan runtime
in 50 hour increments.
You can adjust the room
temperature display to read
0
up to 4˚above or below the
factory calibrated reading.
CALIBRATE
The cooling swing setting
is adjustable from 0.2˚ to
2˚. For example: A swing
setting of 0.5˚ will turn the
cooling on at approximately
0.5˚ above the setpoint
and turn the cooling off at
approximately 0.5˚ below
COOLSWING
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 approximately 0.5˚
below the setpoint and turn
the heating off at 0.5˚ above
HEAT SWING
the setpoint.
Wiring
Typical 2H/2C System: 2 Transformer
REMOVE JUMPER
RC
RH
Y
C
W/E
G
W2
Y2
R
L1
(HOT)
L2
C
Technician Setup
Tech Setup Steps
This setting allows the thermostat
to operate a PTAC. This will allow
PTAC Mode for multiple fan speeds selectable
in the next two tech settings.
This setting allows you to choose
PTAC Fan
the number of fan speeds the
Speeds thermostat will control.
G = Low Speed Fan
(Only displayed if
PTAC mode is set B/O = Medium Speed Fan
to "ON")
Y2 = High Speed Fan
PTAC Medium
This setting will select the
terminal for medium fan speed
Fan Speed
Default
operations. The selected terminal
Terminal
cannot be used for reversing valve
operations when heat pump is
(Only displayed if
OFF
enabled.
PTAC mode is set
to "ON" and PTAC
fan speeds is set
to "3")
When turned on the thermostat
will operate a heat pump. EM.
0˚F
Heat will show as an option in the
Heat Pump
system switch tech setting.
Use the
adjust.
You can configure the system
switch for the particular
application. Heat - Off - Cool,
0.5˚
Heat - Off, Cool - Off, Heat - Off -
System Set
Cool – Auto.
Note: Emergency Heat is available
in heat pump mode only.
A Note About Auto Changeover:
In Auto you have the ability to switch between Auto Heat or Auto
Cool by pressing the system key. This can be done once the current
0.8˚
mode has reached its setpoint. For example: if in Auto Heat, the heat
setpoint must be satisfied before the thermostat will allow you to
switch to Auto Cool. You can switch out of Auto by holding down the
SYSTEM key. To get back into Auto, you must toggle the system key
to Auto.
R
C
COMPRESSOR
RELAY
HEAT RELAY
FAN RELAY
HEAT RELAY 2
COMPRESSOR
RELAY 2
Typical 2H/1C Heat Pump System
RC
RH
COMPRESSOR
Y
RELAY
C
EMERGENCY
W/E
HEAT
G
FAN RELAY
W2
O
COOL
CHANGEOVER
VALVE
B
HEAT
CHANGEOVER
VALVE
Adjustment Options
LCD Will Show
Use the
select ON/OFF.
PTAC MODE
Use the
select , 2 or 3.
1. Speeds: ON, Auto
2. Speeds: Low, High, Auto
3. Speeds: Low, Med, High,
PTAC FAN
Auto
SPEEDS
Use the
select O/B terminals.
0
M FAN
TERMINAL
OFF configures the
thermostat for conventional
systems.
ON configures the
and button to
thermostat for heat pump
systems.
HEAT PUMP
Use the
until the desired application
is flashing. AUTO = (Auto
Changeover)
SYSTEM SET
Off
Heat
Cool
L1
(HOT)
L2
R
L1
(HOT)
L2
C
R
L1
(HOT)
L2
C
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Default
and buttons to
OFF
and buttons to
2
and buttons to
0
OFF
or buttons
Heat
Off
Cool
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