16
Fig. 8: MODE 1 - Hydronic Multi-Boiler
Fig. 10: MODE 2 - Single Boiler with Indirect
on System Loop
Fig. 9: MODE 1 - Hydronic Multi-Boiler
MASTER
NOTE:
MODE 1 can also be used for process heat-
ing applications in conjunction with a buffer/storage
tank when operating temperatures above 150
°
F are
required. Care must be given to ensuring water hard-
ness is less than 5 grains per gallon to ensure scale
free operation. Configure for Manual Differential and
set for 3 to 5ºF.
Type H models of XFyre have three modes available
to them to address the various applications the units
can be applied to. Type WH units will only have the
WH configuration available to them for use with
potable water applications when directly connected to
a hot water storage tank. For detailed information
about applications and modes, see VERSA IC manu-
al, catalog 5000.72.
Mode 1 (Type H Units Only)
This mode selection is for hydronic heating systems
with single or multiple boilers (Maximum 4 boilers) in
primary/secondary piping configuration with or without
Outdoor Air Reset (S4). See Figs. 7 & 8. The system
temperature is controlled by the System sensor (S3).
The Boiler Pump (P1) runs during any call for heat.
The System Pump (P2) runs whenever the system is
enabled for heating and the outdoor air temperature is
lower than the warm weather shut down (WWSD) tem-
perature setting (if utilized). The Boiler Pump is
delayed “off” as user defined in the
BOILER
menu,
and System Pump is delayed “off” as user defined in
the
ADJUST
menu.
Maximum distance not to exceed 4 pipe
diameters or 12” whichever is less
NOTE:
Indirect DHW is disabled in MODE 1; use
MODE 2 or MODE 3.
