Setting The Optional Features; Post-Purge Or No Post-Purge; Valve Proofing System; Pilot Ignition (Pi) Or Direct Main Burner Ignition (Dbi) - Honeywell DBC2000E10 Series Handbook

SETTING THE OPTIONAL FEATURES

1. Post-purge or no post-purge

Post-purge mode (default for all DBC2000E
models): before going to standby after heat
demand has ended, the DBC2000E performs a
15s post-purge cycle to ventilate the burner
chamber, with the blower switched on and the
firing rate in low position to save energy.
No post-purge mode (selectable option): the
DBC2000E goes to standby with the blower
switched off immediately after heat demand ends
and the firing rate goes to low position.
STD model:
To enable no post-purge, apply line voltage to
terminal 12 on the wiring base. Practically this
means that a jumper is placed between terminals
1 (L) and 12.
ENH/ULT models:
To enable no-post-purge, make the correct DIP-
switch setting on the front of the DBC2000E.
SW1 = POSTPURGE select.
Factory set to post-purge (SW1=off).
See fig. 4-5 to locate the DIP switches.
2. Pilot Ignition (PI) or Direct main
Burner Ignition (DBI)
PI mode (default): the main burner is ignited
indirectly by using an interrupted or intermittent
pilot flame. After the pilot is ignited and
stabelized, the DBC2000E goes for a second trial
nd
of ignition (2 safety and main stabilization are
3s) to ignite the main burner.
DBI mode (selectable option): the intermittent
pilot ignition cycle is used to ignite the main
burner directly via the spark igniter. The second
trial for ignition has become redundant in this
mode. In DBI mode the 2
stabilization times are 0s and DBC2000E goes
straight into running/modulate after pilot
stabilization.
SW1: Post-purge use
SW2: DBI/PI select
SW3: VPS use
SW4: VPS pre-config
SW5: VPS post-config
SW6: VPS test time
SW7: VPS test time
SW8: Not used
Fig 4-5 Configuration DIP switches (VPS) on the front of the DBC2000E (ENH/ULT only)
nd
safety and main
(default: off = post-purge enabled)
(default: off = PI enabled)
(default: off = disabled)
(default: off = disabled)
(default: off = disabled)
(default: off = see timing table)
(default: off = see timing table)
(for future use)
STD model:
To enable DBI mode, apply line voltage to
terminal 22 on the wiring base. Practically this
means that a jumper is placed between terminals
1 (L) and 22.
ENH/ULT models:
To enable DBI mode, make the correct DIP-switch
setting on the front of the DBC2000E.
SW2 = DBI/PI select. Factory set to PI (SW2=off).
See fig. 4-5 to locate the DIP switches.
3. Valve Proofing System – VPS
(ENH/ULT models only)
Connect a gas pressure switch (such as the
C6097A2210) to terminal 22 on the wiring base
(N.O. contact).
Rule of thumb: adjust the pressure switch to 0.5x
the inlet pressure.
Table 5: VPS function:
VPS enabled
SW3 = on
VPS disabled
SW3 = off
VPS pre-config
SW4 = on
SW5 = off
VPS post-config
SW4 = off
SW5 = on
VPS both config
SW4 = on
SW5 = on
Table 6: VPS timing:
VPS test time
25s
VPS test time
20s
VPS test time
15s
VPS test time
10s (default)
11
VPS is being performed
VPS is not used (default)
The VPS test cycle is
performed during pre-purge
cycle, right after the heat
demand has started.
The VPS test cycle is
performed right after the heat
demand has ended.
The VPS test cycle is
performed before and after
the heat demand cycle.
SW6=on
SW7=on
SW6=on
SW7=off
SW6=off
SW7=on
SW6=off
SW7=off
Note for DIP switches:
on = upwards
off = downwards
ENS7003R16 KO65 2013