Honeywell 7800 Series Installation Instructions Manual page 20

RM7888A 7800 SERIES RELAY MODULE
Pilot Configuration
State Name
Initiate (See below)
Initiate INITIATE mm:ss
Initiate INITIATE HOLD: AC
(AC Freq/Noise)
Initiate INITIATE HOLD: AC
(AC Line Dropout)
Initiate INITIATE HOLD: AC
(AC Frequency)
Initiate INITIATE HOLD: AC
(Low Line Voltage)
Off STANDBY
— STANDBY HOLD: F/G
(Flame Detected)
— STANDBY HOLD: T7
(Lockout ILK)
PURGE HOLD: T18
(Low Fire Switch)
Purge PURGE 01:00
Control Cool PURGE 02:00
Low Combustion Air PURGE 03:00
Only
Pilot Ignition PILOT IGN mm:ss
Main Train Fuel On MAIN IGN 00:00
Burner Fuel Valve MAIN IGN 00:ss
Open (Pilot Timeout)
Release to RUN
Modulation
— RUN
@Low 10 Sec RUN
Pilot Relight PVHOLD IGN 00:ss
Low Off 5 Sec. PVHOLD IGN 01:00
Drive to Low PVHOLD IGN 02:00
32-00214—01
Table 7. Pilot Configuration Operation Sequence States.
S7800 Keyboard
Display Module
Displayed Text
The Initiate state allows the relay module to complete initialization after a
power-up or whenever a problem that would prevent normal operation (such
as an ac line problem), the Initiate state is entered.
Displayed during timed portion of the Initiate state.
Displayed during Initiate state if the ac frequency is low or noise is present.
Displayed during Initiate state if the ac line power was lost.
Displayed during Initiate state if the ac frequency is high.
Displayed during Initiate state if the ac line voltage is low.
Remaining idle until valid input(s) are received. All safety loads are
commanded off.
Displayed when a flame is detected.
Displayed when a call for operation is active and the Limits Complete signal
is off.
Displayed when a call for operation is active and the Low Fire Switch signal
is off.
Purge at high fire. All safety loads are commanded off. Display indicates
Purge type 1 = Purge.
Purge at the motor position commanded by the modulating control. All
safety loads are commanded off. Display indicates Purge type 2 = Control
Cool.
Purge at low fire. All safety loads are commanded off. Display indicates
Purge type 3 = Low Combustion Air Only.
Establish a pilot flame. Display shows state and elapsed time. At end of Pilot
Ignition timed state, timer will stop and display will show final time while a
hold exists.
Allow for main valve operators to be placed into the normal operating
condition. Display shows state with zero elapsed time while waiting for a
hold condition(s).
Establish a main flame and drop the pilot flame. Display will show MFEP
state elapsed time.
Allow normal operation to take place where a modulating control provides
the motor position signal.
When special function input terminal 20 is off, relay module will command a
Low Fire motor position.
When the Low Fire input becomes energized for a continuous time period of
10 seconds, the sequence will leave the Release to Modulation state and
proceed to the Pilot Relight state (PV Return sequence only).
Re-establish the pilot flame and drop the main flame. Display indicates
elapsed time in this timed state (PV Return sequence only).
Wait for the Low Fire input signal to become de-energized for a continuous
period of five seconds and then proceed to the Main Train Fuel On state
after driving back to the Low Fire position. Display indicates that sequence
is in Pilot Hold State type 1 = Waiting for Low Off 5 Sec.
Commands the low fire motor position and waits until the Low Fire input
becomes energized before proceeding to the Main Train Fuel On state.
Display indicates that sequence is in Pilot Hold State type 2 = Waiting for
Low Fire On.
Purpose of State
20