4
STEP FOUR
TESTING THE WIRING
No wires should be connected to the control during testing.
A good quality electrical test meter, capable of reading from at least 0 — 200 V (ac) and at least 0 — 2,000,000 Ohms, is essential to
properly test the wiring and sensors.
Test the Sensors
Test the sensors according to the testing procedure in Data Brochure D 070. Ensure the
sensor wires are not connected to the control terminals.
Test the Power Supply
Make sure exposed wires and bare terminals are not in contact with other wires or
grounded surfaces. Turn on the power and measure the voltage across the 24 V (ac)
power supply. The voltmeter should read between 22 and 26 Volts.
Test the Powered Inputs
Measure the voltage between the heat demand wire and the power wire that goes to C- of the control. The voltmeter should read
between 22 and 26 volts when there is a call for heat.
Test the Outputs
Short the boiler wires and power up the boiler circuit; the boiler should fire. Remove power from the boiler circuit.
STEP FIVE
ELECTRICAL CONNECTIONS TO THE CONTROL
The installer should confirm that no voltage is present at any of the wires.
Output Connections
Boiler Relay
Connect the 120 V (ac) or 24 V (ac) boiler circuit directly to the
Boiler relay (4 and 5)
terminals. These terminals go to dry relay contacts.
Powered Input Connections
24 V (ac) Power
Connect the 24 V (ac) power supply to terminals
Power R+— C- (7 and 8) on the control.
Heat demand
Connect the C- side of the transformer to terminal
T (6) through a switching device. This
provides a heat demand to the control.
Caution The C- of the same transformer used to power up the control must be used
to provide the heat demand.
Sensor and Unpowered Input Connections
Do not apply power to these terminals as this will damage the control.
Outdoor Sensor
Connect the two wires from the Outdoor Sensor 070 to the terminals
Com Sen — Out
Sen (1 and 3). The Outdoor Sensor measures the outdoor air temperature.
Boiler Sensor
Connect the two wires from the Boiler Sensor 071 to the terminals
Com Sen — Boil Sen
(1 and 2). The Boiler Sensor measures the supply water temperature going from the
boiler to the system.
Settings
Before adjusting the settings, read through the sequence of operation to ensure that you understand how the control operates. The
following page describes how to program these settings into the control once it has been powered up.
STEP SIX
ESSENTIAL CONTROL SETTINGS
Starting Temp.
The
Starting Temp. setting is the starting supply water temperature of the heating curve, and can be adjusted from 35 to 150
°
F (2
to 66
°
C). In applications where fan coils are used, the
Starting Temp. may need to be set higher to prevent cold drafts.
Warm Weather Shut Down (WWSD
)
The WWSD can be adjusted from 35 to 85
°
F (2 to 29
°
C). The boiler will be shut down when the outdoor temperature is warmer than
this setting. Factory setting is 68
°
F (20
°
C).
Ω
Ω
2
3
1
Com
Sen
Boil
Sen
Out
Sen
Heat
Demand
Switches
Class II
Transformer
C
R
5
R+ C-
T
6 7 8
4
Power
Boiler
24 V (ac)
5
R+ C-
T
6 7 8
4
Power
Boiler
2
3
1
Com
Sen
Boil
Sen
Out
Sen
