16
Not to exceed 4 pipe diameters
or 12" (305 mm)
1
FACTORY INSTALLED SENSOR
FIELD INSTALLED SENSOR
S1
S2
P2
S4
P1
VERSA
PIM
MODBUS
ENABLE
0-10/4-20mA
S3
1
Figure 16.
Mode 1 - Single Boiler with Primary/Secondary Piping
Figure 17.
Mode 1 - Boiler Cascade with Primary/Secondary Piping
A
B
C
D
P1a
P1b
P1c
P1d
S1a
S4a
MODBUS
ENABLE
S2a
S1b
S1c
S1d
S2d
S3a
1
P2a
S2c
S2b
MASTER
FACTORY INSTALLED SENSOR
CONNECT SYSTEM PUMP
IN PARALLEL FROM EACH
CASCADE FOLLOWER
OUTPUT
FIELD INSTALLED SENSOR
VERSA
(MASTER)
0–10 / 4–20mA
PIM
VERSA
PIM
VERSA
PIM
VERSA
PIM
Not to exceed 4 pipe diameters
or 12" (305 mm)
1
The system temperature is controlled by the System sensor
(S3). The integral 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 WWSD temperature setting (if utilized).
The System Pump (P1) is delayed “Off” as user-defined
in the Heater menu and the System Pump (P2) is delayed
“Off” in the ADJUST menu, and the integral Boiler /
Injection Pump (P1) is delayed "Off" as user-defined in the
BOILER menu.
For pipe sizing, see
Table G
and
Table H
.
NOTE:
MODE 1 can also be used for process heating
applications in conjunction with a buffer/storage tank
when operating temperatures above 150°F (66°C) are
required. Care must be given to ensure water hardness is
no more than 15 grains per gallon for scale free operation.
