47 750-265
Fig. 22. Auxiliary pump implementation.
Pump Exercising
Each of the pumps (A, B, and C) will have an exercise timer
that helps to ensure that pumps do not “freeze up” due to long
periods of no use. However, this is active only if the pump is
attached to some function: a pump output that is not attached
is not exercised.
For pumps that are attached, whenever the pump is off, a
timer will measure the pump-off time. When the day counter
reaches the value provided by the Pump Exercise Interval
(Days) parameter, then the pump will be turned on for the time
given by the Pump Exercise Time parameter.
Whenever the pump is on, for any reason, the counter is set to
zero to begin a new measurement.
Table 28. Auxiliary Pump Parameters.
Parameter Comment
Auxiliary Pump Output None, Pump A, Pump B, Pump C
This parameter allows the Auxiliary pump function to be disconnected or to be attached to
any of the pump outputs.
Auxiliary Pump On When CH Pump is On, DHW Pump is On, Either CH or DHW Pump is On
This parameter determines which pump output is coupled to the Auxiliary pump function: CH,
DHW, or either of these.
If the latter is selected then the Auxiliary pump is controlled by ORing the two output
functions.
Auxiliary Pump Control On, Auto
The Auxiliary 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.
AUXILIARY
PUMP
OUTPUT
AUXILIARY PUMP CONTROL: ON
(SELECTIONS ARE: ON/AUTO)
AUXILIARY PUMP DEMAND
FROM CH AND CH STATUS
AUXILIARY PUMP DEMAND
FROM DHW AND DHW STATUS
EXERCISE PUMP DEMAND
AUX PUMP STATUS FROM CH = CH PUMP WOULD BE ON
BUT IS FORCED OFF
AUX PUMP STATUS FROM DHW = DHW PUMP WOULD BE ON
BUT IS FORCED OFF
SLAVE COMMAND FOR
AUXILIARY PUMP
“CH...” OR “EITHER...”
DHW...” OR “EITHER...”
ON WHEN:
• SLAVE COMMAND ONLY
• CH PUMP IS ON
• DHW PUMP IS ON
• EITHER CH OR DHW PUMP IS ON
DON’T EXERCISE PUMP IF
CH/DHW IS FORCED OFF.
6
5
7
3
4
2
1
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.
M28034
Table 29. Pump Exercising Parameters.
Parameter Comment
Pump Exercise Interval (Days) 0, or N
If set to zero, the exercise function is disabled. Otherwise this parameter provides the interval
time between exercising the pumps. It is common to all three pump outputs (A, B, and C).
Pump Exercise Time MM:SS
If the time is zero then the exercise function is disabled. Otherwise this parameter provides
the time that a pump should be on to exercise. It is common to all three pump outputs (A, B,
and C).
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