User's Manual Part 1
20 I-Wave Installation Guide
Copyright © 2006 Intermatic, Inc.
Low-Voltage Wiring
CAUTION: Your I-Wave Control Center is equipped with a Low Voltage Raceway. 
You must use this raceway for all low voltage wiring, including the 12 Volt wires 
from the transformer. You cannot mix high and low voltages in the high voltage 
compartment.
Water Temperature Sensor
The I-Wave Control System comes equipped 
with a Water Temperature Sensor. This sensor is 
needed to monitor and maintain both the pool 
and spa water temperature depending on the 
position of the diverter valves. It needs to be 
installed in order for the thermostat control to 
work. Power needs to be disconnected when 
connecting the temp sensor. Only an Intermatic 
Sensor will work with this controller. Follow 
the directions below to install and mount your 
water temperature sensor. Refer to page 43 For 
programming instructions.
Drill a 3/8” hole in the pipe between the 
lter pump and lter and install the Water 
Temperature Sensor with hose clamp (not 
provided). Ensure the O-ring is in place.
Run the wire to the Control Center, through 
the low voltage raceway. Connect both wires 
to the Panel Mount Receiver. (See Figure 3-11.)
Freeze (Air Temperature) Sensor
The I-Wave Control System uses an optional Air 
Temperature Sensor (178PA28A) for measuring air 
temperature and implementing the Freeze Protection 
Circuit—necessary for the freeze protection circuit and 
programming to work. Power must be disconnected 
when connecting the freeze sensor. Only an Intermatic 
Sensor will work with this controller. Refer to page 34 
for programming information.
Install the Air Temperature Sensor outside the 
Control Center, preferably onto a piece of conduit at 
or near your equipment pad. Use the clip provided 
with the sensor. Do not install in direct sunlight or 
around motors or other heat sources.
Run the wire to the Control Center through the low 
voltage raceway. Connect Air Sensor directly to the 
back of the three-circuit clock mechanism. (See 
Figure 3-12.)
1.
2.
1.
2.
Fireman’s Switch Wires
(Brown/Brown)
Water Temp Wires
(Black/White)
Make 
connection
with 
connectors
provided
Cable to P1353ME
Cable to P4232ME
Wires from
Water Temp Sensor
(Black/White)
(178PE4)
Fireman’s Switch Wires
(Brown/Brown)
Water Temp Wires
(Black/White)
Make 
connection
with 
connectors
provided
Cable to P1353ME
Cable to P4232ME
Wires from
Water Temp Sensor
(Black/White)
(178PE4)
Figure 3-11Figure 3-11
Remove clock and connect 
Freeze (Air Temp) Sensor 
(178PA28A) here
Freeze (Air
Temp) Sensor 
(178PA28A)
Remove clock and connect 
Freeze (Air Temp) Sensor 
(178PA28A) here
Freeze (Air
Temp) Sensor 
(178PA28A)
Figure 3-12Figure 3-12










