19
Figure 19.
Mode 2 - Single Heater with Indirect on System Loop - Primary/Secondary Piping
S1
S2
P2
S4
P1
VERSA
PIM
MODBUS
ENABLE
0-10/4-20mA
S3
1
P3
S5
AQUASTAT
LOCATED IN
OUTLET PIPE
Maximum distance not to exceed
4 pipe diameters or 12" (305 mm)
1
FACTORY INSTALLED SENSOR
FIELD INSTALLED SENSOR
Mode 2
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) with indirect DHW on the system loop (with or
without priority). The system temperature is controlled by
the System Sensor (S3). The Indirect DHW Sensor (S5)
determines the indirect call/tank setpoint. See
Figure 19.
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 Heater 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 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. 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.
NOTE:
See VERSA IC Manual (5000.72) for more
information on cascade systems.
S1a
S2a
P2a
S3a
S1b
S2b
S1c
S2c
S1d
S2d
A
B
C
D
S4a
(MASTER)
PIM
VERSA
PIM
VERSA
PIM
VERSA
PIM
VERSA
V1a
MODBUS
0-10 VDC
ENABLE
M
V1b
M
V1c
M
V1d
M
CONNECT SYSTEM PUMP
CASCADE FOLLOWER
IN PARALLEL FROM EACH
OUTPUT
P3
S5
AQUASTAT
LOCATED IN
OUTLET PIPE
= FACTORY INSTALLED SENSOR
= FIELD INSTALLED SENSOR
Maximum distance not to exceed
4 pipe diameters or 12" (305 mm)
1
F10628
Figure 20.
Mode 2 - Heater Cascade with Indirect on System Loop - Primary/Secondary Piping
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