Dunkirk DKVLT-050 Installation, Operation & Maintenance Manual page 78

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
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Explanation