Endurance | Page 19 |
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The appliance will attempt to ignite three times, if ignition is not successful, the appliance will lock out and display [LO]. Ignition reset is done by pressing the reset button on top of the control panel. EBP models will then operate to heat the transfer tank.
7.EBP ONLY: Turn on a hot water tap. This puts the appliance in the DHW mode.
Caution
Should any pronounced odor of gas be detected, or if the gas burner does not appear to be functioning in a normal manner, close main shutoff valve, do not shut off switch, and contact your heating contractor, gas company, or factory representative.
You MUST check flame monitoring control (ignition system safety shut off device).
1.Close gas shutoff valve with burner operating.
2.The flame indicator light will go out and blower will continue to run for the post purge cycle. Three additional attempts to light will follow including
3.Open gas shutoff valve. Press reset button on the top of the control panel. The ignition sequence will start again and the burner will start. The appliance will return to its previous mode of operation.
6D. Mode and On/Off Buttons Operation
The on/off button it is used to switch the
appliance from standby [ON] to standby [OFF] and vice versa. It is NOT an isolation switch. The mode button accesses all other functions as described in their particular sections of this manual.
SECTION 7.
Maintenance and Component
Description
7A. Unit Pump
The unit pump operates whenever there is a call for heat or hot water.
It is a
If a pump change is required for any reason, valve off the boiler and drain approximately 1 or 2
gallons (approx.
7B. Gas Valve
The gas valve is a 24VDC solenoid operated, negative pressure regulated ratio valve. The outlet pressure may be adjusted as described in the service section. It is designed to operate with supply pressures of
7C. Safety Limit Switch
The Safety Limit Switch is an automatic reset switch with a fixed set point of 230°F (110°C). To replace the switch, shut off the 120 volt power.
Disconnect the 2 wires from the quick connects at the switch and remove the switch. To replace, perform the same operations in reverse. Turn on disconnect switch and check boiler.
7D. Boiler Control Printed Circuit Board (PCB)
The Integrated Boiler Control Module controls the ignition process, the combustion process, the temperature of the boiler flow and return, and the transfer tank temperature* and provides both domestic hot water* and space heating on demand.
To do this it takes inputs from three temperature sensors, a domestic hot water flow switch, an overheat thermostat (safety limit) and an external space heating switch, such as a room thermostat, zone valve end switches or circulator relay contacts. It then controls the pump, blower, ignitor and gas valve sequencing.
It constantly displays the boiler outlet temperature when the appliance is operating in one of its demand modes. It also allows the user to obtain information from the appliance to determine the water temperature at three different locations within the appliance and to find up to 8 previous faults stored in memory.
If replacement of PCB is necessary, shut off the 120 volt power and disconnect the wire connectors from the pcb. Remove the PCB from its location posts.