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Electronic Aquastat
8.7
The outdoor sensor will :
a)
Maintain the selected maximum water temperature when the outdoor temperature is at +14° F or
colder.
b) Automatically and proportionally compensate by varying the water temperature between the
maximum and minimum when the outdoor temperature is between +14°F and +50°F.
c) Maintain the minimum water temperature when the outdoor temperature is between +50°F and
+68°F.
d) Prevent boiler operation above +68°F.
NOTE : If you choose not to use the outdoor sensor, don't connect it to the "OT / OT" terminals nor jumper
these terminals. You will not use this feature and the water will simply be maintained at the maximum
selected temperature.
8.8
Connect the thermostat or the zone valve end switch wires to "C" and "W1" terminals on the electronic
board. Power stealing thermostats require an isolation relay (not included).
8.9
Circulating Pump Control. The "P / P" terminals are connected to dry contacts of a relay (capacity up
to 1 HP) and are used to start the pump. This relay is switched ON with the first heating step and OFF
after the last one. A separate 120V / 1Ø service must be provided from the electrical panel to the boiler
for the pump. For Electric Boiler only systems, refer to the wiring diagram. For Electric Boiler with fossil
fuel backup, see the diagram on page 23 labeled 'PUMP WIRING WITH FOSSIL FUEL BACKUP
BOILER' as the pump must also run when another source of heat is selected.
Follow the extra steps dedicated to a FFB installation in the start-up sequence.
8.10
Set the room thermostat heat anticipator (when available) to 0.2 Amperes.
8.11
If the system is used with Load Management control, connect the Utility signal to "S1 / S2" terminals.
A closed contact enables the boiler, an open contact disables the boiler.
8.12
The installation is now ready for start-up procedure and testing.
9
Start-up procedure and test sequence
Do not energize electrical elements prior to purging system and verifying proper water circulation
Double check the following carefully :
9.1
All wiring and plumbing is complete.
9.2
Pipes have been cleaned, the system has been flushed and filled again.
9.3
Without powering the entire unit, install a jumper between the "P / P" terminals (using proper gauge of
wire) and switch the pump breaker ON as to let the pump run alone. Verify that the pump is running freely
and check for leaks. During this test, a lot of bubbles will travel through the system and air will be
eliminated by the automatic vents. You can accelerate the process by purging the radiators manually.
Shut off the pump breaker at the panel, then remove the jumper between the "P / P" terminals.
9.4
The pressure in the system has been stabilized at approximately 15 PSI (104 kPA).
9.5
The entire system is now almost free of air.
9.6
The room thermostat anticipator (when available) has been set at 0.2 Amperes.
9.7
Switch the boiler breaker ON at the main panel.
MAXIMUM
WATER TEMPERATURE
Fig. 4
°F
+14
+23
+32
+41
+50
Fig. 5
Page 6
MINIMUM
WATER TEMPERATURE
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