HAMWORTHY HEATING LTD
63
Merley Boiler Sequence Controller
500001210/D
Cascade Strategy
The default cascade strategy is the Optimum number of boilers firing to reduce ON/OFF cycling..
Alternative strategies are available, but MUST be implemented by an HHL engineer
-
contact 01202 662555
Options are:
•
Maximum number of boilers firing to meet the demand
•
Minimum number of boilers firing to meet the demand
1
st
changeover 2
nd
changeover 3
rd
changeover 4
th
changeover
K 1
K 2
K 3
K 4
K 2
K 3
K 4
K 1
K 3
K 4
K 1
K 2
K 4
K 1
K 2
K 3
t [h]
100
300
400
200
P [kW]
23
7
9Z
07
Lag boiler
Lead boiler
t
=
Total number of operating hours of all lead boilers [h]
P
=
Total output of cascade [kW]
Auto source sequence
exclusion
Leading source
Setting automatic source sequence exclusion is only used in connection with the
activated heat source sequence (operating line 3540).
Using automatic source sequence exclusion, the first and / or the last boiler can be
exempted from automatic changeover.
None.
The order of switching on the boilers changes when the number of hours set is reached
(operating line 3540).
First
The first boiler in terms of addressing will always be the lead boiler. With the other
boilers, the order of switching on changes when the set number of hours is reached
(operating line 3540).
Last
The last boiler in terms of addressing will always be the last. The other boilers change
when the set number of hours is reached (operating line 3540).
First and last
The first boiler in terms of addressing will always be the lead boiler. The last boiler in
terms of addressing will always be the last. The boilers in between change when the set
number of hours is reached (operating line 3540).
The leading source is only selected in connection with the fixed order of the heat source
sequence (operating line 3540).
The boiler selected as the lead boiler is always the first to be switched on, or the last to
be switched off. The other boilers are switched on and off in the order of their device
addresses.
