CleaverBrooks CFC Operation, Service & Parts Manual page 194

CB FALCON
• Force On conditions: These bits enable or disable
reasons why the pump may be forced on. A force on
condition flows to the "Force On" connection to the pump
output block, and is not inhibited by Force Off.
• General controls: Two of the bits enable or disable general
behavior that is not connected to the pump output block.
6 IDENTICAL BLOCKS: CH, DHW, BOILER, SYSTEM, AUX1 & AUX2
USE THIS PUMP FOR LEAD-LAG MASTER DEMANDS
USE THIS PUMP FOR STAND-ALONE DEMANDS
(BOTH MAY BE CHECKED)
PUMP
DEMAND
OPTIONS
IF TWO (OR MORE) PUMP CONTROL BLOCKS ARE
CONNECTED TO THE SAME PUMP OUTPUT,
THEN THEIR THREE OUTPUT SIGNALS
, AND ARE OR'D TOGETHER.
THIS PROVIDES THE FOLLOWING BEHAVIOR:
IF EITHER IS FORCE ON, THE PUMP IS ON
EITHER CAN INHABIT NORMAL PUMP
DEMAND WITH A FORCE OFF
NORMAL PUMP DEMAND CAN COME FROM
EITHER BLOCK
Parameter
XX pump output
XX pump control
750-265
PUMP CONTROL BLOCK
FORCE OFF
OPTIONS
START DELAY
MM:SS
EXPIRED
START DELAY TIME 0=DISABLE
TIMER STARTS WHEN THE INPUT
TURNS ON TO KEEP THE PUMP OFF
FOR AWHILE AT FIRST (BUT ONLY IF
BURNER IS JUST STARTING UP)
Fig. 22. Pump control block.
Table 29. Pump Control Block Parameters.
None, Pump A, Pump B, Pump C
This allows the XX pump function to be disconnected or to be attached to any of the pump
outputs.
If two pump blocks are connected to the same pump output then their signals are effectively
OR'd together as shown in Fig. 22.
On, Auto
The XX pump can be turned on manually, or it can be set to operate automatically. If it is
turned on then it remains on until changed back to Auto.
Fig. 22 shows how a pump control block works when
connected to a pump output. The Pump On Options determine
the sources that normally turn the pump on. These may be
modified by an optional Start Delay and an optional Overrun
Time. However, this normal pump on demand may be inhibited
by the Force Off options. No matter what the normal Pump On
Demand, or the Force Off conditions are requesting, there are
Force On options that always turn the pump on.
NOTE: THE PUMP CONTROL: AUTO, ON
PARAMETER IS ALSO A FORCE ON WHEN SET
TO "ON"
FORCE ON
FORCE ON
IF TRUE, THE PUMP WILL BE ON
OPTIONS
FORCE OFF
INHIBITS
PUMP
DEMAND
OVERRUN
TIMER
MM:SS
OVERRUN TIME 0=DISABLE
TIMER STARTS WHEN THE INPUT TURNS OFF
TO KEEP THE PUMP OFF FOR AWHILE AT FIRST
(BUT ONLY IF NO OTHER SOURCE
CALLS FOR HEAT)
B
ON
PUMP B
OFF
ON
DMD
OFF
B
ON
DMD
OFF
DMD
Comment
54
PUMP A, B, OR C
EXERCISE RUNS THE PUMP IF
IT HAS BEEN IDLE TOO LONG AS
CONNECTION
DEFINED BY PARAMETERS
A B C
COMMON TO ALL PUMPS.
EXERCISE WILL NOT RUN IF IT
IS FORCED OFF.
ON
OFF
DMD
IDLE DAYS
COUNTER
EXERCISE
TIMER
CYCLE COUNT
EDITABLE IN THE FIELD
IN CASE A PUMP IS REPLACED
CYCLE COUNT AND IDLE DAYS BOTH
APPEAR TO BE ATTRIBUTES OF THE
PUMP CONTROL BLOCK THAT IS THE PUMP
OUTPUT CONNECTED TO, BUT EACH IS
ACTUALLY PART OF THE PUMP A, B, OR C
OUTPUT. FOR EXAMPLE, IF TWO PUMP
CONTROL BLOCKS ARE CONNECTED TO THE
SAME PUMP, THEIR CYCLE COUNTS AND
IDLE DAYS VALUES WILL BE THE SAME
IN THE TWO PUMP CONTROL BLOCKS.
CYCLE