1-6 Description – Burner Management System
FlexFit – Linkageless Control – Revision 1.0
PREFERRED
UTILITIES MFG CORPORATION
DD
EE
SS
CC
RR
II
PP
TT
II
OO
NN
Figure 1 – 3
Call For Heat
Servo Check
Purge Position
Min.
Max.
High Fire
Low Fire
Purge Hz
Ignition Hz Low Fire Hz
Ignition
10 Sec Pilot
Main Fuel Valve(s)
(SSOVs)
Running (Lockout)
Interlocks
15 Sec Pilot
FD Fan
Preignition Interlock
(Proof of Closure)
High Fire Switch
Low Fire Switch
Standby
Safe Start
Checks
Prestart Purge
Trial For
Ignition
Trial For
Ignition
Modulate Post Purge Standby
Flame Signal
Moving
to Purge
Moving to
Ignition
High Fire (Purge)
Low Fire (Ignition)
Modulate
Servos
Start Limits
ALFCO
(Option)
VSD
Note 1
Note 2
Note 4
M
W
5
7
6
P
3
8
D
FR
X
12
11
Out
(with FB)
13
Note 5
Note 3
Note 6
Note 6
Standby Position
Ignition Position
Out
(with FB)
Note 7
Out
Out
Out
Out
Out
In
In
In
In
In
Out
Out
Out
In
FlexFit 110 Timing Diagram
TIMING DIAGRAM NOTES:
1. If using call for heat, safe start checks will begin once both the start limits (13) input and the call for heat are made.
If not using call for heat, safe start checks will begin once the start limits (13) input is made.
2. Must be low during safe start checks if parameter "P1.1.4 MAF/Run Interlocks Safe Start Test" on page 4-61 is enabled.
3. The FD fan will start after the time delay set by parameter "P1.2.3 FD Fan Start Delay" on page 4-61.
4. Must be low during safe start checks if parameter "P1.1.5 PAF Switch Installed" on page 4-61 is set to Yes.
5. During the purge cycle, the high re switch (purge interlock) can be open for no more than 30 seconds (cumulative). The
purge timer does not run while open.
6. If direct spark ignition (DSI) is being used, the main fuel valves will open during PTFI and the MTFI state will be skipped.
7. If no main fuel valve(s) (SSOVs) have proof of closure, jumper 120 VAC to (7) and set parameters "P1.2.10 Fuel 1 Proof of
Closure Installed" and "P1.2.11 Fuel 2 Proof of Closure Installed" to No.
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