750-265 46
Fig. 21. Boiler pump implementation.
Auxiliary Pump
The Auxiliary pump function is implemented as shown in
Fig. 22.
The Auxiliary pump function turns on whenever the CH or
DHW pumps are on. It is off when neither of these is on.
This function has no parameter for overrun time; it inherits all
of its behavior related to overrun, frost protection, high limits,
and anticondensation by simply following the CH and DHW
pumps.
Table 27. Boiler Pump Parameters.
Parameter Comment
Boiler Pump Output None, Pump A, Pump B, Pump C
This parameter allows the Boiler pump function to be disconnected or to be attached to any of
the pump outputs.
Boiler Pump Control On, Auto
The Boiler 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 demand and overrun time.
Boiler Pump Overrun Time Minutes: Seconds
This time indicates how long the Boiler pump should remain on after demand ends.
BOILER PUMP
OUTPUT
BOILER PUMP
DEMAND FROM CH
BOILER PUMP
DEMAND FROM DHW
BOILER PUMP CONTROL: ON
(SELECTIONS ARE: ON/AUTO)
CH PUMP WOULD BE ON,
BUT IT IS FORCED OFF CH
BY ANTI-CONDENSATION
DHW PUMP WOULD BE ON,
BUT IT IS FORCED OFF DHW
BY ANTI-CONDENSATION
DHW FROST PROTECT PUMP DEMAND
OUTLET HIGH LIMIT ACTIVE
EXERCISE PUMP DEMAND
BOILER PUMP IS
FORCED OFF BY CH
BOILER PUMP IS
FORCED OFF BY DHW
THESE DO NOT INTERACT, BECAUSE THEY ARE
MUTUALLY EXCLUSIVE (ULTIMATELY DRIVEN BY
“DEMAND PRIORITY” WHICH SELECTS ONLY
ONE OR THE OTHER).
CH FROST PROTECT PUMP DEMAND
DON’T EXERCISE PUMP IF
CH/DHW IS FORCED OFF.
DON’T EXERCISE PUMP IF
CH/DHW IS FORCED OFF.
INHIBIT OVERRUN
IF FORCED OFF.
CH FROST PROTECT PUMP OVERRUN
DHW FROST PROTECT PUMP OVERRUN
LOAD
OVERRUN TIME
CLEAR (INHIBIT)
PARAMETER
OTHER NAMES ARE INTERNAL SIGNALS.
CONNECTION TO PUMP A, B, OR C
1–9 ON/OFF PRIORITY.
CIRCLED NUMBERS ARE REASONS WHY PUMP IS ON.
NUMBERS WITHIN SQUARES ARE REASONS WHY PUMP IS OFF.
THE LOWEST NUMBERED REASON THAT EXPLAINS THE
ACTUAL PUMP CONDITION IS USED.
9
10
11
1
5
6
7
8
4
12
3
2
M28033
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