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45 750-265

Fig. 20. System pump implementation.

Boiler Pump

The Boiler pump function is implemented as shown in Fig. 21.

The Boiler pump function turns on whenever pump demand

exists from any source. It has its own overrun time if LL, CH,

or DWH is the demand source. For CH frost protection and

DHW frost protection it turns on and follows the overrun time

provided by those sources. It also turns on with no overrun

when the outlet high limit or DHW high limit is active.

Table 26. System Pump Parameters.

Parameter Comment

System Pump Output None, Pump A, Pump B, Pump C

This parameter allows the System function to be disconnected or to be attached to any of the

pump outputs.

System Pump Control On, Auto

The System pump can be turned on manually, or it can be set to operate automatically. If it is

turned on, it remains on until changed back to Auto.

In Auto mode it operates according to the LL master and slave demand and overrun time.

System Pump Overrun Time MM:SS

This time indicates how long the System pump should remain on after the LL master or slave

pump demand with overrun ends.

M28032

SYSTEM PUMP

OUTPUT

SYSTEM PUMP CONTROL: ON

(SELECTIONS ARE: ON/AUTO)

EXERCISE PUMP DEMAND

LOAD

OVERRUN TIME

LL MASTER PUMP DEMAND

(WILL NOT OCCUR UNLESS

MASTER IS ENABLED)

SLAVE COMMAND FOR

SYSTEM PUMP, NO OVERRUN

SLAVE COMMAND FOR

SYSTEM PUMP, WITH OVERRUN

PARAMETER

OTHER NAMES ARE INTERNAL SIGNALS.

CONNECTION TO PUMP A, B, OR C

1–4 ON PRIORITY.

CleaverBrooks CFC User Manual

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