Home > Pro1 Technologies > Pro1 Technologies T855iSH Wall Thermostat Instruction Manual
Pro1 Technologies T855iSH Wall Thermostat Instruction Manual
Wiring Diagrams
Wiring Diagrams
A 24VAC common connection is required with this thermostat.
Power supply
Factory - installed jumper. Remove only when installing on 2 transformer systems.
Use either O or B terminals for changeover valve.
If DEHUM relay requires a normally-energized input, set Dehumidify relay to NC
in Technician Setup.
Typical 2H/2C system with Dry Contact Humidifier
R
Typical 2H/2C system with 24 VAC Humidifier
R
RC
RC
RH
Y
L1(HOT)
L1(HOT)
L2
RH
Y
L2
COMPRESSOR
RELAY
COMPRESSOR
RELAY
C
C
C
C
W/E
G
W/E
G
HEAT RELAY
HEAT RELAY
FAN RELAY
FAN RELAY
W2
Y2
H
W2
Y2
H
HEAT RELAY 2
HEAT RELAY 2
COMPRESSOR
RELAY 2
COMPRESSOR
RELAY 2
DRY CONTACT
HUMIDIFIER
24V RELAY
NORMALLY-OPEN
TERMINALS
HUMIDIFIER
HUM
HUM
Typical 2H/2C system with Dehumidify Terminal
R
Typical 5H/3C Heat Pump System
R
RC
RH
Y
L1(HOT)
RC
L1(HOT)
L2
L2
RH
COMPRESSOR
RELAY 1
COMPRESSOR
RELAY
Y
C
C
C
W/E
C
AUXILIARY
HEAT 1
W/E
G
HEAT RELAY
FAN RELAY
G
FAN RELAY
W2
W2
Y2
D
AUXILIARY
HEAT 2
Y2
O
HEAT RELAY 2
COMPRESSOR
RELAY 2
B
COMPRESSOR
RELAY 2
COOL
CHANGEOVER OR
COMPRESSOR 3
HEAT
CHANGEOVER OR
COMPRESSOR 3
DEHUMIDIFIER
RELAY
13
14
Technician Setup Menu
Technician Setup Menu
This thermostat has a technician setup menu for easy installer
configuration. To set up the thermostat for your particular application:
Tech Setup Steps
LCD Will Show Adjustment Options
Default
The swing setting often called
“cycle rate”, “differential”, or
“anticipation”is adjustable. A
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˚
1. Press the MENU button.
2. Press and hold the TECH SET button for 3 seconds. This 3
second delay is designed so that homeowners do not accidentally
access the installer settings.
smaller swing setting will cause
more frequent cycles and a larger
swing setting will cause fewer
cycles.
Heating
Swing
0.4˚
0.4
below the setpoint and turn
the heating off at 0.5˚ above
the setpoint.
3. Configure the installer options as desired using the table below.
HEAT SWING
Use the
or
keys to change settings and the NEXT
This setting allows the thermostat
to operate a PTAC. This will allow
for multiple fan speeds selectable
in the next two tech settings.
Use the and buttons to
select ON/OFF.
or PREV key to move from one step to another.
Note: Only press the DONE key when you want to exit the
Technician Setup options.
PTAC Mode
OFF
2
OF
PTAC MODE
4. Press the DONE key to exit.
This setting allows you to choose
the number of fan speeds the
thermostat will control.
Use the and buttons to
select , 2 or 3.
Tech Setup Steps
LCD Will Show Adjustment Options
Default
PTAC Fan
Speeds
This feature will flash a reminder
You can adjust the filter
1. Speeds: ON, Auto
2. Speeds: Low, High, Auto
3. Speeds: Low, Med, High,
Auto
after the elapsed run time to
remind the user to change the
filter. A setting of “OFF”will
disable this feature.
change reminder from “OFF”
to 2000 hours of runtime in
50 hour increments.
Filter Change
Reminder
G = Low Speed Fan
B/O = Medieum Speed Fan
Y2 = High Speed Fan
(Only displayed
if PTAC mode is
“ON”)
2
OFF
OF
FILTER
FAN SPEEDS
This feature allows the installer
to change the calibration of the
room temperature display. For
example, if the thermostat reads
70˚ and you would like it to read
72˚ then select +2.
This setting will select the
terminal for medium fan speed
operations. The selected terminal
cannot be used for reversing valve
operations when heat pump is
enabled.
Use the and buttons to
select O/B terminals.
You can adjust the room
temperature display to read
up to 4˚above or below the
PTAC Medium
Fan Speed
Terminal
Room
Temperature
Calibration
factory calibrated reading.
0˚F
0
(Only displayed
if PTAC mode is
ON and PTAC fan
speeds is set to 3)
0
CALIBRATE
0
The swing setting often called
“cycle rate”, “differential”or
“anticipation”is adjustable. A
smaller swing setting will cause
more frequent cycles and a larger
swing setting will cause fewer
cycles.
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
MED FAN TERM
When turned on the thermostat
will operate a heat pump. EM.
Heat will show as an option in the
system switch tech setting.
Use the and button to
adjust.
OFF configures the
thermostat for conventional
systems.
Cooling
Swing
0.5˚
0.5
0.5˚ above the setpoint
and turn the cooling off at
approximately 0.5˚ below
the setpoint.
Heat Pump
ON configures the
thermostat for heat pump
systems.
OFF
OF
COOL SWING
HEAT PUMP
Swing Setting Tip
System Mode
PTAC (conventional)
Default Heat Heat Options Cool Default Cool Options
The second stage will turn on at 2x the swing setting. The second stage will
turn off when 1x the swing is reached. For example, if the swing setting is .5
degrees for heating and the thermostat is set at 70˚F, the first stage will turn
on at approximately 69.5˚F. The second stage will turn on at 69˚F. The second
stage will turn off at 69.5˚F and the first will turn off at 70.5˚F. If the third
stage is used, it will turn on at 68.5˚F and turn off at approximately 69˚F.
1
2
2
2
1
2, 1
5, 4, 3, 2, 1
2, 1
1
1
2
2
1
1
PTAC (Heat Pump)
Heat Pump
Conventional
3, 2, 1
3, 2, 1
16
15
| General | Details |
|---|---|
| Name | Pro1 Technologies T855iSH Wall Thermostat Instruction Manual |
| Make | Pro1 Technologies |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.59 MB |
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