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Part number 550-100-252/0520
– 59 –
Figure 38 SVF
TM
sequencing options — SMART, PARALLEL or SERIES (examples shown for 3-boiler network)
SERIES Sequencing PARALLEL Sequencing SMART Sequencing
Higher Part-Load Efficiency
Quicker Boiler Response Time
100
5
50
25
0
oiler 1 oiler 2 oiler 3
100
5
50
25
0
oiler 1 oiler 2 oiler 3
BASERATE HIGH = 60%
60
100
5
50
25
0
oiler 1 oiler 2 oiler 3
BASERATE LOW = 20%
40
STAGE 1 – Lead boiler modulates up to a maximum of
100% before turning on the next boiler in the sequence.
The STABILIZE TIME allows time for the boilers to
modulate to meet system demand before turning on ad
-
ditional boilers.
STAGE 1 – Lead boiler modulates up to a maximum of
Base Rate High before turning on the next boiler in the
sequence. e STABILIZE TIME allows time for the boil-
ers to modulate to meet system demand before turning
o
n additional boilers.
STAGE 1 – Lead boiler modulates up to a low ring rate
before turning on the next boiler in the sequence. e
STABILIZE TIME allows time for the boilers to modulate to
meet system demand before turning on additional boilers.
100
5
50
25
0
oiler 1 oiler 2 oiler 3
1
00
5
50
25
0
oiler 1 oiler 2 oiler 3
30 30
BASERATE HIGH = 60%
1
00
5
50
25
0
oiler 1 oiler 2 oiler 3
20
20
BASERATE LOW = 20%
STAGE 2 – Boiler #2 in sequence ignites and both boilers
modulate to so their combined energy output matches the
energy output of Boiler #1 at 100%. Aer a short MOD
DELAY TIME, the boilers will be released to modulate.
STAGE 2 – Boiler #2 in sequence ignites and both boilers
modulate to so their combined energy output matches
the energy output of Boiler #1 at Base Rate High. Aer
a short MOD DELAY TIME, the boilers will be released
to modulate.
STAGE 2 – Boiler #2 in sequence ignites and both boilers
modulate to BASE RATE LOW. Aer a short MOD DELAY
TIME, the boilers will be released to modulate.
100
5
50
25
0
oiler 1 oiler 2 oiler 3
1
00
5
50
25
0
oiler 1 oiler 2 oiler 3
60 60
BASERATE HIGH = 60%
1
00
5
50
25
0
oiler 1 oiler 2 oiler 3
30
30
BASERATE LOW = 20%
STAGE 3 – Both boilers modulate up to a maximum of
100% before turning on the next boiler in the sequence.
The STABILIZE TIME allows time for the boilers to
modulate to meet system demand before turning on ad
-
ditional boilers.
STAGE 3 – Both boilers modulate up to a maximum of
Base Rate High before turning on the next boiler in the
sequence. e STABILIZE TIME allows time for the boil-
ers to modulate to meet system demand before turning
o
n additional boilers.
STAGE 3 – Both boilers modulate up to a low ring rate
before turning on the next boiler in the sequence. e
STABILIZE TIME allows time for the boilers to modulate to
meet system demand before turning on additional boilers.
100
5
50
25
0
oiler 1 oiler 2 oiler 3
100
5
50
25
0
oiler 1 oiler 2 oiler 3
BASERATE HIGH = 60%
40 40 40
100
5
50
25
0
oiler 1 oiler 2 oiler 3
BASERATE LOW = 20%
20 20
20
STAGE 4 – Boiler #3 in sequence ignites and then all boil-
ers modulate to so their combined energy output matches
the energy output of Boilers #1 and #2 at 100%. Aer a
short MOD DELAY TIME, the boilers will be released to
modulate.
STAGE 4 – Boiler #3 in sequence ignites and then all
boilers modulate to so their combined energy output
matches the energy output of Boilers #1 and #2 at Base
Rate High. Aer a short MOD DELAY TIME, the boilers
will be released to modulate.
STAGE 4 – Boiler #3 in sequence ignites and then all boilers
modulate to BASE RATE LOW. Aer a short MOD DELAY
TIME, the boilers will be released to modulate.
100
5
50
25
0
oiler 1 oiler 2 oiler 3
100
5
50
25
0
oiler 1 oiler 2 oiler 3
1
00
5
50
25
0
oiler 1 oiler 2 oiler 3
STAGE 5 – Aer all available boilers are ring, boilers are
release to modulate up to 100% of rate.
STAGE 5 – Aer all available boilers are ring, boilers are
release to modulate up to 100% of rate.
STAGE 5 – Aer all available boilers are ring, boilers are
release to modulate up to 100% of rate.
ROTATION AND SEQUENCE (continued)
SVF
™
Series 1
COMMERCIAL CONDENSING GAS-FIRED WAT ER BOILER
— Advanced Manual
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