FULTON PHW 1000, Installation, Operation And Maintenance Manual

Page: 61 / 94

Fulton Heating Solutions, Inc. -- PHW Manual -- 2010-0713
Page 61
5. Sequence of Operation for Modulated Pulse Hydronic Boilers
a) When the boiler receives a call for heat, the prepurge cycle is initiated.
b) The mod motor is driven to high fire.
c) After the high fire switch in the mod motor is closed, the prepurge count begins.
d) Following prepurge, the spark generator energizes and the gas valves open.
e) Upon proof of flame, the fan and spark are turned off.
f) At this point, the modulation temperature controller controls the mod motor and firing rate
of the boiler.
g) When the boiler outlet temperature reaches set point, the boiler is turned off and
prepurge begins.
h) The boiler control then monitors the outlet temperature and waits for the next call for
heat.
Note
A series of relays are used in the above sequence of operation. Please refer to the
wiring diagram for details.
6. Programming Instructions for Yokogawa UT320 Standard Program
a) Hold SET/ENT key until control is in Operator mode. PV display will show oppa.
b) Press Down Arrow key until control is in Set Up mode. PV display will show stup.
c) Press SET/ENT key twice until control is in Function mode. PV display will show func.
d) Press Down Arrow key until control is in Input/Output mode. PV display will show I/O.
e) Press SET/ENT key to bring you to the first parameter in the Input/Output mode.
f) Parameter Setting Procedure: The values for each parameter that are shown in the PV
display should match the values entered at the factory. If they differ, press the Up Arrow
key or Down Arrow key until the factory value is displayed. Some values, such as High
Temperature Range (rh), can be adjusted according to system design.
g) Once the desired value is displayed, press the SET/ENT key to maintain it in the control’s
memory.
h) Only those values that are Shaded with Bold & Italic values in the menu pertain
to the program constructed for Fulton pulse boilers.
Note
It is important to know that if the following parameters are altered, the entire set of
factory values will be altered: (In) or (UNIT) located in the Input/Output Menu; (AL1)
in the Functional Parameters Menu; (A1) in the Operating Parameters Menu.