17
Figure 16.
Hydronic Primary/Secondary Piping
Mode 1
This mode selection is for hydronic heating systems with
single or multiple heaters (maximum 4 heaters) in primary/
secondary piping configuration with or without Outdoor Air
Reset (S4).
See
Figure 16
and
Figure 17
.
The system temperature is controlled by the System
Sensor (S3). The Heater 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) temperature setting (if utilized).
The Heater Pump (P1) is delayed “Off” as user-defined in
the Heater menu and the System Pump (P2) is delayed
“Off” in the ADJUST menu.
NOTE:
In cascade configuration, the system pump and
DHW pump (if applicable) outputs from each cascade
member must be connected in parallel to activate the
system pump and DHW pump during “limp-along”
operation respectively. See VERSA IC Manual (5000.72)
for detailed information.
FROM SYSTEM
BOILER PUMP
ISOLATION VALVE
(TYP)
4 PIPE DIAMETERS
OR MAX 12" (305 mm)
MAX. 5' (1.5 m)
TO SYSTEM SENSOR
TO SYSTEM
PRV
(PIPE TO DRAIN)
F10591
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