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Installation
Caution
Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury.
It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards. This
electronic control is not intended for use as a primary limit control. Other controls that are intended and certified as safety
limits must be part of the control circuit.
STEP ONE
Check the contents of this package. If any of the contents listed are missing or damaged, please contact your sales representative for
assistance.
Type
PC702-1 includes:
• PC702-1 Boiler Reset Control
• One Outdoor Sensor
• One Strap on Sensor
• Instruction Sheet
Replacement sensors are available from Taco, Inc. Strap on Sensor – 9300-2044RP Outdoor Sensor – 9300-2052RP
Note
: Carefully read the details of the Sequence of Operation section in this brochure to ensure that you have chosen the proper control
for your application.
STEP TWO
Installing the Control
• Grasp the front cover by the fingertip grips on the top and bottom of the
enclosure and pull the front cover off. Remove the wiring cover screw.
• The enclosure is mounted onto a 2” x 4” electrical box near the Taco
Zone Control.
• The mounting holes in the enclosure accept #6 screws.
• Wiring to the control enters the wiring chamber through the back or
bottom of the enclosure.
• To reassemble the enclosure, first replace the wiring chamber cover and
then push the front cover onto the enclosure until it snaps into place.
Installing the Outdoor Sensor
Note
The temperature sensor (thermistor) is built into the enclosure.
• Take the sensor cover off by sliding it upward relative to the sensor base.
• Use one round or pan head screw to attach the base of the sensor to the wall.
• The sensor is wall mounted and the wiring enters through the bottom of the enclosure. The hole for the
cable entry must face downward in order to prevent water from entering and filling the enclosure.
• The sensor should be mounted on a wall which best represents the heat load on the building (i.e. a
northern wall for most buildings and a southern facing wall for buildings with large south facing glass
areas). The sensor should not be installed near heat sources such as ventilation or window openings.
• The sensor should be installed at an elevation above the ground that will prevent accidental damage
or tampering.
• Install the Outdoor Sensor and run the wiring back to the control mounting location.
Installing the Boiler Sensor
Note
This sensor is designed to mount on a pipe or in a temperature
immersion well.
• The sensor can be strapped directly to the pipe using the cable tie
provided. Insulation should be placed around the sensor to reduce the
effect of air currents on the sensor measurement.
• The Boiler Sensor should be placed downstream of a pump or after an
elbow or similar fitting. This is especially important if large diameter pipes
are used because the thermal stratification within the pipe can result in
erroneous sensor readings. Proper sensor location requires that the fluid
is thoroughly mixed within the pipe before it reaches the sensor.
INTERSTAGE DELAY
The PC702-1 has an adjustable interstage delay setting. This setting sets the minimum time delay between the firing of the first stage
and the firing of the second stage.
Each stage has a minimum on time, and a minimum off time of 30 seconds.
Cable Entry
Hole for
mounting screw
