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APPENDIX A - CONTROL MODULE
User Interface Display
Two pump modes are available:
1.
Pump Mode = 0 'CH or CH&DHW'
• In this mode either the CH or DHW pump terminal is energized
depending on the type of demand (CH or DHW).
• CH and DHW pumps are never energized at the same time.
• In the case of a simultaneous call for both CH and DHW, the
energized pump depends on whether the boiler is currently
supplying the CH or DHW demand. Refer to DHW Priority
settings below.
• This is typical of a hydronic system design with separate CH
and DHW Pumps.
2.
Pump Mode = 4 'System Pump'
• In this mode only one external system pump is installed in the
hydronic system. This pump will energize independent of the
type of demand (CH or DHW).
• Connect this pump to the CH/System Pump electrical terminal
block. See page 56 for diagram.
• The DHW pump terminal does not function.
• This is typical of a hydronic system design which utilizes zone
valves for all CH zones and an DHW indirect tank.
Note:
• Pump Mode selection depends on electrical and hydronic
system design. Please refer to sections 5 and 8 for
recommended hydronic piping and electrical configurations.
• Internal heat exchanger pump is energized anytime demand
exists regardless of Pump Mode setting or type of demand
(CH or DHW).
'Service Reminder' feature allows the installer to enable or
disable a service reminder notification on the User Interface at a
predefined interval .
Service reminder does not affect operation of boiler in any way.
It is only a reminder to End User that routine preventative
maintenance is required by qualified service technician.
Allowed Range: 1 to 999 days
81
Explanation
PN 240011320 Rev. G 10/01/2021]
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