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1 Service (continued)
Details Screen:
The Details Screen is accessed by pressing the DETAIL button
on the Status Screen. This screen shows the status of the
various safeties, inputs and outputs to each control module.
Selection of the control module to be viewed is accomplished
by pressing the SELECT button. The control module being
displayed is shown in the module box.
Displayed items are as follows:
• SH Enable - Is ON when a system heat call has been
received from a remote end switch or enabling device. Is
OFF when a system heat call is not present.
• Manual Reset High Limit - Is ON when the manual reset
high limit is closed. Is OFF when the manual reset high
limit is open.
• SH Pump - Is ON when a system heat call has been
received and the boiler pump is energized. Is OFF
when the boiler pump is de-energized.
• HW Thermostat - Is ON when a Hot Water Generation
call has been received from a tank thermostat. Is OFF
when a Hot Water Generation call has not been received
from a tank thermostat.
• Air Pressure Switch - Is ON when the combustion air
blower is energized and the flap valve switch is closed.
Is OFF when the flap valve switch is open.
• Gas Valve - Is ON when the gas valve is energized. Is OFF
when the gas valve is de-energized.
• Gas Pressure Switches - Is ON when the high and low gas
pressure switches are closed. If OFF when either the high
or low gas pressure switches are open.
• Flow Switch / Low Water Cutoff - Is ON when the low
water cutoff contacts are closed or if an optional flow
switch is used and it is closed as well. Is OFF when the
low water cutoff contacts are open or if an optional flow
switch is open.
• Alarm - Is ON when a fault has been detected and the
alarm contacts are closed. Is OFF when the alarm
contacts are open.
• Louver Proving Switch - Is ON when a remote proving
safety switch is closed. Is OFF when a remote proving
safety switch is open.
• Blocked Drain Switch - Is ON when the blocked drain
switch on the condensate trap is closed. Is OFF when the
blocked drain switch on the condensate trap is open.
• Blower Power - Is ON when the combustion air blower is
energized. Is OFF when the combustion air blower is de-
energized.
• System Pump - Is ON when a system heat call has been
received and the system pump has been energized. Is
OFF when the system pump is de-energized.
• Auto Reset High Limit - An auto reset high limit is not used
in the standard configuration of the SYNC boiler. If OFF is
shown then a wiring problem exists.
• Run Time Contacts - Is ON when the burner is energized.
Is OFF when the burner is de-energized.
• HW Pump - Is ON when a Hot Water Generation call has
been received from a tank thermostat or a tank sensor and
the hot water generation pump is energized. Is OFF when
the hot water generation pump is de-energized.
• 0-10Vdc - Shows the voltage signal being delivered from a
remote Building Management System (BMS).
15
Service Manual