UTICA BOILERS UBSSC-050 Installation, Operation & Maintanance Manual page 66

User Interface Display
B O I L E R C O N F I G
P u m p M o d e
C H o r C H & D H W
B O I L E R C O N F I G
S E R V I C E R E M I N D E R
S t a t u s
R e m i n d e r
APPENDIX A - CONTROL MODULE
Two pump modes are available:
1.
•
•
•
•
2.
▲
M O D E : 0
•
▼
•
•
•
Note:
'Service Reminder' feature allows the installer to enable or
disable a service reminder notifi cation on the User Interface at a
predefi ned interval .
▲
Service reminder does not affect operation of boiler in any way.
O n
It is only a reminder to End User that routine preventative
3 6 5 d a y s maintenance is required by qualifi ed service technician.
Allowed Range: 1 to 999 days
66
Explanation
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.
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.
• Pump Mode selection depends on electrical and
hydronic system design. Please refer to sections 5
and 8 for recommended hydronic piping and electrical
confi gurations.
• Internal heat exchanger pump is energized anytime
demand exists regardless of Pump Mode setting or type
of demand (CH or DHW).