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Relay connection with system pump
Note: It is only Priority 2 that the following procedure is applied.
1. When installing the system pump, wire a relay as shown below.
2. Choose a suitable location for the relay where it will be protected from moisture.
3. Wire the power for the pump through the relay as shown below.
Pump power supply
output terminal (Priority 2)
in the junction box
Relay connection with larger pumps (>2.2 Amp.)
1. Instead of wiring the pump directly to the Priority 1 or Priority 2 terminals, wire a relay to the terminal
as shown below.
2. Choose a suitable location for the relay where it will be protected from moisture.
3. Wire the power for the pump through the relay as shown below.
Pump power supply output
terminal in the junction box
13.
Maintenance
• The venting system must be examined periodically by a qualified service technician to check for
any leaks or corrosion.
• The burner flame must be checked periodically for a proper blue color and consistency.
• If the flame does not appear normal, the burner may need to be cleaned.
• If the burner needs to be cleaned, it must be performed by a qualified service technician.
• Do not obstruct the flow of combustion and ventilation air.
• The pressure relief valve must be operated once a year to ensure that it is functioning properly
and there is no obstruction.
• Turn the power off to the unit before opening the relief valve, and make sure that water draining
out of the valve will not cause any damage.
• If the relief valve discharges periodically, it may be due to thermal expansion in a closed water
system. Contact the water supplier or a local plumbing inspector on how to correct this situation.
Do not plug the relief valve.
• Do not install air separators where negative pressure can develop in the system. Air will be drawn
in. Install air separators at the highest level in the system.
• Inspect expansion tanks once a year to confirm there is enough air in them.
• Replace anti freeze every two years or as required by the anti-freeze manufacturer to prevent
corrosion and clogging of the pipes.
Warning: There is a scald potential if the output temperature is set too high.
Should overheating occur, or the gas supply fail to shut off, turn off the manual gas control valve to the appliance.
Do not use this appliance if any part has been under water. Immediately call a qualified service
technician to inspect the appliance and to replace any part of the control system and any gas control
which has been under water.
Periodically check and clean the filter inside the cold water inlet of the unit.
1
Priority 2 Pump
0
System Pump
1
4
0
2
Circulation Pump
Periodically check the following to ensure proper
operation of the boiler.
120VAC
4
Relay (ex. Omron G7L2ABUBJCBAC120)
2
120VAC
Relay (ex. Omron G7L2ABUBJCBAC120)
25
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