19
BACKWASH
RELAY 1 - Backwash
No.
Command
Description
1
Sequence 1 ON
Turns ON the sequence the commands are using.
2
ON if MPS 11 is ON
On if the control MPS is on.
3
ON DELAY
00:00:30 (Add 4:30 to MPSs for each additional filter).
4
Max C Time ON
00:04:00 How long relay stays on each cycle.
5
Min Time OFF
01:00:00
6
No Command
Available for customization of system.
PROGRAMMING pH – WITH CHEMICAL KIT
RELAY 8 - pH - ACID
No.
Command
Description
1
Sequence 1 ON
Turns ON the sequence the commands are using.
2
Manual ON Time 00:01:00
Time relay stays ON when manually turned ON
3
Prop G ON 2000
Decreases the ON time, which reduces the amount of chemicals being fed
as the measurement approaches the set point.
4
ON if pH > 7.50
pH set point.
5
Max Time ON 00:01:00
How long the relay feeds each cycle.
6
Min Time OFF 00:05:00
Mixing time – this is the time allowed for the chemicals to go to
the pool, mix, and return to the sensor.
7
Overfeed 01:00:00
Maximum time the relay can feed chemicals in one overfeed period of time
8
OFF if Switch 1 is OFF
Important!
this relay controls the flow switch and prevents chemicals from
feeding if there is no flow. See WARNING below.
9-20
No command
Available for customization of system.
1. This command sets the sequences to 1, meaning all the following sequences enabled for sequence 1 will be calculated.
2. Sets the manual ON time for this relay to 1 minute. When the relay is manually turned ON from the service menu it will be ON for
1 minute, and then revert to normal control (Programmed Cycle).
3. Sets the proportional gain to 2000, pH error = 65535 / 2000 = 32, or 0.32 pH units. When the pH error is greater than 0.32 the
MPS will use the full ON time, when the error is less the ON time will be linearly scaled down to less time.
4. The set point is 7.5. When the pH is greater than 7.5 the MPS will be ON. The following commands will modify this ON condition.
If there were no more commands, this MPS would be ON as long as the pH was greater than 7.5.
5. This command will calculate the maximum and minimum times that the relay should be ON. As the current reading approaches
the set point, it will be on for a shorter length of time, thus initiating proportional feed.
6. After the MPS has been through an ON cycle, the OFF cycle will start. This MPS will be OFF for 5 minutes. This time allows for the
chemicals added to mix with the water before more chemicals are added.
IMPORTANT:
There should always be an OFF time command following an ON time command to ensure that
the MPS operates properly.
7. This command will limit the amount of chemicals to be fed in a specified time period. If the overfeed timers are set to clear at 8AM
and 5PM, then this MPS would not be ON longer than 1 hour in either of those 2 time periods. If the acid pump can feed 10 gal-
lons per day, this would limit the acid to 0.42 gallons in either time period.
8.
Chemical burn hazard. Place this command last in the sequence to be sure that no chemical is pumped when
there is no flow through the filter.
This command
MUST
be last in the sequence in order to function properly. This command is
critical for safety and ensures that the MPS will not be ON when there is no flow. Even if the previous commands determine that
the MPS should be ON, this command, when placed last, will override the other commands and prevent chemical feed at no flow.
PROGRAMMING ORP – SR–2700 WITH CHEMICAL KIT
Note: The ORP is almost the same as the pH except that:
• The delay command is not used and
• The set point will be for ORP.
APPENDIX D: DEFAULT PROGRAMMING
The following tables show the factory default programming.
