Watts tekmar 294 - Settings - Staging and Sequencing; System Staging Settings; Boiler Group Sequencing

IOM-T-294 2205 © 2022 tekmar
25
Parameter Range Description
POST PURGE
0.0 to 20.0 minutes
Default: 2.0 minutes
Set the boiler pump post purge time after the burner has shut off.
SYSTEM
BOILER MINIMUM
50 to 230°F
(10.0 to 110.0°C)
Default: 140°F (60.0°C)
The minimum allowed boiler target temperature used for the non-condensing boiler
group. Check the boiler manufacturer’s manual for recommended minimum boiler
supply temperatures.
This setting is applicable if there is at least one boiler available in the non-condensing
boiler group.
BOILER MAXIMUM
50 to 230°F
(10.0 to 110.0°C)
Default: 200°F (93.0°C)
The maximum allowed boiler target temperature.
STAGING PID or Proportional
Set either PID or Proportional staging. PID staging is recommended for central
heating while Proportional staging is recommended for dedicated DHW applications.
PID AUTO
DIFFERENTIAL
Off or On
Default: On
Select if automatic PID differential is used. Available when using PID staging.
PID MANUAL
BOILER
DIFFERENTIAL
2 to 42°F
(1.0 to 23.5°C)
Default: 10°F (5.5°C)
Set the manual PID boiler differential. Available when using PID staging and PID
Auto Differential is Off.
PID AUTOMATIC
STAGE DELAY
Off or On
Default: On
Select if automatic PID staging is used. Available when using PID staging.
PID MANUAL
STAGE DELAY
0.5 to 40.0 minutes
Default: 6.0 minutes
Select the manual PID staging delay between boilers or boiler stages. Available when
using PID staging and PID Automatic Stage Delay is Off.
PROPORTIONAL
INTERSTAGE
DIFFERENTIAL
1 to 10°F
(0.5 to 5.5°C)
Default: 4°F (2.0°C)
Set the temperature differential required to turn on the next boiler or next boiler stage.
Available when using Proportional staging.
PROPORTIONAL
INTERSTAGE
ON DELAY
0.5 to 10.0 minutes
Default: 1.0 minutes
Set the boiler run time required before turning on the next boiler or the next boiler
stage. Available when using Proportional staging.
PROPORTIONAL
INTERSTAGE
OFF DELAY
0.5 to 10.0 minutes
Default: 0.5 minutes
Set the boiler off time required before turning on the same boiler or the same boiler
stage again. Available when using Proportional staging.
MINIMUM STAGE
RUN TIME
0.5 to 10.0 minutes
Default: 0.5 minutes
Set the minimum boiler run time required when a boiler or boiler stage is turned on.
Available when using Proportional staging.
MINIMUM STAGE
OFF TIME
0.5 to 10.0 minutes
Default: 0.5 minutes
Set the minimum boiler off time required when a boiler or boiler stage is turned
off before it is allowed to turn back on. Available when using Proportional staging.
CONDENSING
GROUP
SEQUENCING
Sequential or Parallel
Default: Sequential
Select to use sequential or parallel boiler staging for condensing boilers.
NON-CONDENSING
GROUP
SEQUENCING
Sequential or Parallel
Default: Sequential
Select to use sequential or parallel boiler staging for non-condensing boilers.
CONDENSING
GROUP ROTATION
Off or On
Default: On
Select if equal runtime rotation is used for condensing boilers.
NON-CONDENSING
GROUP ROTATION
Off or On
Default: On
Select if equal runtime rotation is used for non-condensing boilers.
Settings (5 of 8)