LP-428 Rev. 6.6.16
45
Function 23 Cascade Mode
Top Boiler
CASCADE MODE
COMMON FLUE 23
Allows the user to select the cascade
mode. If one or more 1000 or 1700
units are cascaded in a common
vent manifold, select the number
of individual cascaded boilers in
the system on the cascade master
(2 BOILERS if a single MOD CON
1700, 6 BOILERS if three MOD CON
1000s, etc.) On cascade followers
in a common vent system, select
COMMON FLUE to establish a
cascaded system WITH common
vent. Factory Default: 2 BOILERS
on Cascade Master (bottom boiler),
COMMON FLUE on Cascade
Follower (top boiler). Range: ALL
926 / 2 – 8 BOILERS [on cascade
master ONLY] / COMMON FLUE [on
cascade followers ONLY]). NOTE: All
MOD CON 1000 and 1700 boilers are
to be congured as COMMON VENT
systems.
Bottom Boiler
CASCADE MODE
2 BOILER 23
Function 24 Cascade Rotation
CASCADE ROTATION
48 HOURS 24
Sets the amount of hours before
the rst boiler in the cascade ring
rotation will be changed. NOTE: If
this is set to 0, the ring order of the
boilers will not rotate. Default: 48
hours (Range: 0 – 240 hours).
Function 25 Cascade DHW Mode
NOT USED
NOT USED 25
Not applicable on this product.
Screen Description
Function 26 System Freeze Protection
SYS FREEZE PROT
PROTECT OFF 26
NOTE: This parameter is only
present if the boiler is a cascade
master. Allows the user to set the
freeze protection when a system
pump is used. Factory Default: OFF.
Selection of temperature activates
freeze protection. (Range: OFF,
-40
o
F – 104
o
F).
Function 27 Error System Sensor
ERROR SYSTEM SENS
ON 27
Sets the control to display an error
message if the system sensor is
open or shorted. NOTE: This error
does not stop the boiler (or boilers)
from running. Factory Default: ON
(Range: ON / OFF).
Function 28 Freeze Protection
FREEZE PROTECTION
ON 28
Allows the user to set freeze
protection on the boiler. Factory
Default: ON (Range: ON / OFF).
Table 16 - System Setting Program Navigation
Function 29 DHW Modulation Mode
DHW MODULATE MODE
NORMAL MOD 29
This parameter controls how
the boiler modulates for a DHW
demand. In NORMAL MOD mode,
the boiler will modulate down
from high re when there is a DHW
demand. In LOW MOD mode, the
boiler will modulate up from low
re when there is a DHW demand.
This mode is useful to minimize
short cycling when a large boiler
and small indirect tank are used
together. Factory Default: NORMAL
MOD (Range: NORMAL MOD / LOW
MOD).
Function 30 Extra Boiler Mode
EXTRA BOILER MODE
OFF 30
Allows for a non HTP boiler to
be controlled when the cascade
output has risen above the percent
of the cascade ring rate set in this
parameter. Factory Default: O
(Range: 50% - 100%).
Function 31 System Sensor Mode
SYSTEM SENSOR MODE
OFF 31
Suppresses the ‘NO FOLLOWER’
display message if the boiler is used
as a cascade master boiler with no
follower boilers connected. Factory
Default: OFF (Range: ON / OFF).
Function 32 Service Schedule
SERVICE SCHEDULE
OFF 32
Selects a service date or time based
on the boiler run hours to program
the boiler maintenance schedule.
Factory Default: OFF (Range: Date
or Run Hours). NOTE: Without
setting this function, Functions
33/34/35/36 will not display.
Function 37 Modbus Mode
MODBUS MODE
OFF 37
Enables Modbus Mode on the
appliance. Factory Default: OFF
(Range: OFF, ON, AUTO). NOTE:
Turning Modbus Mode “ON” will open
a number of additional parameters
to customize Modbus installation.
See Modbus Instructions (lp-372) for
details. NOTE: Turning this Mode
“ON” without a connected and
powered Modbus communication
adapter (p/n 7350P-629) will result
in improper appliance operation.
Service calls associated with this
ARE NOT covered by warranty.
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