Raypak 88AR-398A, Инструкция по установке и эксплуатации

Страница: 17 / 68

17
Applications & Modes
The VERSA IC Control system is designed for a wide
range of applications. The installer/design engineer
should refer to the following Modes to determine which
best fits the intended application and functionality for
the unit being installed.
The XPak FT has three modes available to them to
address the various applications the units can be
applied to.
Mode 1
This mode is for hydronic heating systems with single
or multiple boilers (Maximum 4 boilers) in primary/sec-
ondary piping configuration with or without Outdoor Air
Reset (S4). 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 weath-
er shut down (WWSD) temperature setting (if utilized).
The Boiler Pump and System Pump are delayed “off”
as user-defined in the ADJUST menu. See Fig. 13 for
piping example.
Mode 2
This mode is for hydronic heating systems with single
or multiple boilers (Maximum 4 boilers) in primary/sec-
ondary piping configuration with or without Outdoor Air
Reset (S4) with indirect DHW on the system loop (with
or without priority). The system temperature is con-
trolled by the System sensor (S3). The Indirect DHW
sensor (S5) determines the indirect call/tank setpoint.
The system temperature is boosted to Target Max
when using the Indirect DHW sensor (S5) during an
indirect call for heat. Priority mode toggles off the
System Pump (P2) when an indirect call for heat is
present. The Boiler Pump (P1) runs during any call for
heat. The Indirect DHW Pump (P3) runs during an
indirect call for heat with no “off” delay. The boiler
Table H: Heater Rates of Flow and Pressure Drops
Notes: Basis for minimum flow is ∆T . Basis for maximum flow is GPM.
Model
No.
MAXIMUM
FLOW
30°F
∆T
40°F
∆T
50°F
∆T
MINIMUM
FLOW
GPM ΔP (ft) ΔT GPM ΔP (ft) GPM ΔP (ft) GPM ΔP (ft) GPM ΔP (ft) ΔT
H7-88A 8.1 5.4 20 5.4 3.3 4.0 2.3 3.2 1.8 2.7 1.4 60
H7-108A 10.5 7.4 20 7.0 4.5 5.2 3.2 4.2 2.4 3.5 2.0 60
H7-198A 18.9 11.6 20 12.6 6.2 9.5 4.3 7.6 3.5 6.3 3.0 60
H7-278A 26.1 20.3 20 17.4 10.1 13.1 6.5 10.5 4.9 8.7 4.0 60
H7-398A 38.3 14.1 20 25.5 7.4 19.2 5.0 15.3 4.0 12.8 3.4 60
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
temperature setting (if utilized) unless an indirect call
for heat is present with priority. See Fig. 14 for piping
example.
Mode 3
This mode is for hydronic heating systems with single
or multiple boilers (Maximum 4 boilers) in primary/sec-
ondary piping configuration with or without Outdoor Air
Reset (S4) with indirect DHW on the boiler loop (with
priority). The system temperature is controlled by the
Supply sensor (S3) whenever the indirect call for heat
is not active. The DHW Supply sensor (S5) determines
the indirect call/tank setpoint. During an indirect call for
heat the boiler firing rate is determined by the water
temperature at the Indirect Supply sensor (S6) and the
Target Max setting when using the Indirect DHW sen-
sor (S5).
The Boiler Pump (P1) runs during all heat calls regard-
less 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 temperature setting (if utilized) unless an indi-
rect call for heat is present. See Fig. 15 for piping
example.
System flow must exceed 120% of boiler flow.
WARNING: All potable water heating with this
boiler must be by an indirect heat exchanger. Only
non-potable water will go through the boiler.
Water Flow Rates