Raypak XFyre 300A, Installation & Operating Instructions Manual

Page: 16 / 60

Domestic Hot Water
When designing the water piping system for domestic
hot water applications, water hardness should be con-
sidered. Table H indicates the suggested flow rates for
soft and medium water. Hard water must be softened
for direct heating with the XFyre. Water hardness is
expressed in grains per gallon.
Fig. 9: MODE 3 - Single Boiler with Indirect
on Boiler Loop
NOTE:
If local codes require a vacuum relief valve,
acquire one locally and install per valve
manufacturer’s instructions.
Fig. 10: WH Units - Single Water Heater with Tank
H Units - Single Boiler with Process Tank
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determined by the water temperature at the Indirect
Supply sensor (S6) and the Target Max setting when
using the Indirect DHW sensor (S5). The Boiler Pump
(P1) runs during all heat calls regardless of priority.
The Indirect DHW Pump (P3) runs during an indirect
call for heat with no “off” delay. The Boiler Pump (P1)
and System Pump (P2) delay “off” as user defined in
the
ADJUST menu. The system pump (P2) runs
whenever the system is enabled for heating and the
outdoor air temperature is lower than the WWSD tem-
perature setting (if utilized) unless an indirect call for
heat is present.
WH – Direct DHW Configuration
When the unit is ordered as a “WH” configuration the
only application available to it is direct DHW with sin-
gle or multiple heaters (Maximum 4 heaters). The tank
temperature is controlled by the System sensor (S3).
The Boiler Pump (P1) runs during any call for heat.
The System Pump (P2) output is active whenever the
system is enabled. The Boiler Pump is delayed “off”
after the Tank Target temperature is achieved and as
user defined in the
ADJUST menu.
NOTE:
A Tank Aquastat can be used in lieu of the
Indirect DHW Sensor (S5). See the Versa IC manu-
al for additional details.
NOTE:
WH units will operate to a maximum tank
temperature of 150F. For temperatures required
above 150F an “H” model boiler must be used and
great care must be given to ensuring water hardness
is less than 5 grains per gallon to ensure scale free
operation. MODE 1 should be used and configured
for setpoint operation for process heating applica-
tions.