Pro1 Technologies T755WH Installation Manual page 4

Reestablishing Communication
Establishing communication between master thermostat
and the base module
The thermostat and base module come factory linked out of the box.
If however, communication is lost, follow this easy- two step process to
re-establish the communication link.
1. Press and hold the base module
button for 3 seconds. The Blue LED
will flash when ready to receive
initial signal from the thermostat.
(Base module must be powered by
24V. Blue LED will be continuously
on when 24V power is present.)
2. Hold the light key (shown here)
of the thermostat for 10 seconds,
the Blue LED on the base module
will stop flashing after
communication has been
established between base module
and the thermostat.
Note:
The blue LED on the base module
will be on when power is present. The blue
LED will flash 3 times everytime it
recieves a signal from the thermostat.
When a relay is on the corresponding LED
relay indicator will be on.
Note:
If the base module does not
receive a signal from the thermostat for
15 minutes it will turn off all relays until
communication is reestablished. The blue
LED base module will also turn off to show
communication has been lost.
Note:
If communication has been lost for
1 hour and if freeze protection is enabled,
heat and emergency heat relays will be
turned on. The heat and emergency relays
will turn on for 10 minutes every hour if
there has been a call for heat in the last 24
hours.
13
Wiring
Note: This thermostat is
hardwire powered when the
24V transformer is
connected to the Common
and RC terminals of the
thermostat.
Typical Cool-Only System With Fan
RC
RH
COMPRESSOR
Y
RELAY
C
W/E
G
FAN RELAY
17
Step 1.
LED Relay Indicators
(placeholder)
Step 2.
Light key
Temperature
Important:
DO NOT hold the light
button on the thermostat for more
than 10 seconds after step 2 above
has been completed. Holding the
light button down will break the
communication link and the base
module button will need to be
pressed again to reestablish
communication.
Note: In many systems
with no emergency heat
relay a jumper can be
used between E and W2.
R
L1
(HOT)
L2
C
Typical Heat Only System With Fan
RC
RH
Y
C
W/E
HEAT RELAY
G
FAN RELAY
Wiring
Caution:
Electrical Hazard
Failure to disconnect the power
before beginning to install this
product can cause electrical shock
or equipment damage.
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 the
terminal block screws.
3. Place nonflammable insulation into
the wall opening to prevent drafts.
Wiring Tips
C Terminal
The C (common wire) terminal does
not have to be connected when the
thermostat is powered by batteries.
Wire Specifications
Use shielded or non-shielded 18-22
gauge thermostat wire.
Wiring
Typical 2H/2C System: 2 Transformer
REMOVE JUMPER
RC
RH
Y
C
W/E
G
W2
Y2
Typical 2H/1C Heat Pump System
R
L1 RC
(HOT)
L2
RH
C
Y
C
W/E
G
W2
O
B
All components of the
control system and the
thermostat installation must
conform to Class II circuits
per the NEC Code.
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.
Note:
In many heat pump systems with
no emergency heat relay, a jumper
can be installed between E and
W2 to turn thermostat into a single
stage control for Emergency Heat
Operation.
R
C
COMPRESSOR
RELAY
HEAT RELAY
FAN RELAY
HEAT RELAY 2
COMPRESSOR
RELAY 2
R
L1
(HOT)
L2
COMPRESSOR
C
RELAY
EMERGENCY
HEAT
FAN RELAY
COOL
CHANGEOVER
VALVE
HEAT
CHANGEOVER
VALVE
Warning:
Installation Tip
14
L1
(HOT)
L2
R
L1
(HOT)
L2
C
18