Appendix – Terms and Denitions A-107
FlexFit – Linkageless Control – Revision 1.0
PREFERRED
UTILITIES MFG CORPORATION
AA
PP
PP
EE
NN
DD
II
XX
Abbreviation Description
PFEP Pilot Flame Establishing Period
PID Proportional–Integral–Derivative (See the denition of PID Controller).
POCS or POC Proof of Closure Switch
PROP Propane
PSI Pounds per Square Inch
PTFI Pilot Trial for Ignition
Px.x.x Designates a FlexFit parameter number (e.g. P1.1.1 = Parameter # 1.1.1)
RAM Random Access Memory
RFO Renewable Fuel Oil (also called LWF – or Liquid Wood Fuel)
RO Relay Output
SCADA Supervisory Control and Data Acquisition
SCFH Standard Cubic Feet Per Hour
SP Setpoint
SSOV or SSO Safety Shutoff Valve
TFI Trial for Ignition
Txx or T-xx Designates a FlexFit terminal number (e.g. T17 (or T-17) = Terminal # 17)
UL Underwriters Laboratories
UV Ultraviolet
UVSC Ultraviolet Self-Checking
VA Volt-Amps
VAC Volts Alternating Current (AC)
VDC Volts Direct Current (DC)
VPPS Valve Proving Pressure Switch
VSD or VFD Variable Speed Drive or Variable Frequency Drive
WSB Warm Standby
XMTR Transmitter
μP Microprocessor
Table A – 1 Abbreviations
Term
Assured Low Fire Cutoff Modulates the boiler to low re before shutting the boiler down.
Burner Management System Or ame safeguard system – is a control system that is dedicated to boiler safety, operator
assistance in the starting and stopping of fuel preparation and burning equipment, and the
prevention of misoperation of and damage to fuel preparation and fuel burning equipment.
Combustion Control System A control system that does the following:
1. Always maintain proper fuel to air ratio
• Too little air causes unburned fuel losses
• Too much air causes excessive stack losses
• Improper fuel-to-air ratio can be DANGEROUS
• Always keep fuel-to-air ratio SAFE
2. Interface with burner management for:
• Purge
• Low re light-off
• Modulate fuel and air when safe to do so
Deadband A neutral zone or interval where no control action occurs
Direct Spark Ignition A spark (like a spark plug) ignites the main ame directly; the pilot is eliminated.
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