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Operational Notes
• Heater A VERSA control board DIP switch 2 must be set to ON (Master). Heaters B, C and D VERSA
control board DIP switch 2 must be set to OFF (slave). Refer to Cascade System Connections on
page 77.
• Set auto reset high limit switch to 15ºC > Tank Setpoint on each heater.
• The PIM operator setpoint dial on each heater MUST also be set to
the Setpoint temperature to prevent an over temperature condition
from occurring when operating in limp mode.
Direct Domestic Hot Water up to 71
• 'Default' column shows factory default settings. Actual values will depend on installation. Required
(Rqd) value shown bracketed in bold should be used.
• Parameters can only be changed if VERSA control board DIP switch 1 is set to ON (up).
• Some parameters are only available if controlling parameter/device is set as indicated in
'Description'.
Parameter
Range
Tank
10.0 ~ 71.0°C
Setpoint
Tank Diff
1.0~ 5.0°C
System
OFF,
Purge
0:20 ~ 20:00 min
Time
Modbus
Off, Monitor, Temp,
Mode
Rate
Address
1 ~ 170
Data Type
RTU, ASCH
Parity
None, Odd, Even
2400, 9600, 19200,
Baud Rate
57600, 115000
H Models – Direct Domestic Hot Water Configuration 72
Refer to
Fig 24 and 25
Fig. 23: W Models - Master/Slave with Tank
o
C - ADJUST Menu Settings
Tank setpoint (only avail if Modbus Mode = Off or Monitor)
Differential for Target Setpoint .i.e. 2.5°C diff = CFH at
2.5ºC below Target Setpoint & CFH end at Target Setpoint
Sets the length of system pump (P2) post purge i.e. pump
run on (only when Modbus Mode para = Temp or Rate and
if PIM DIP switch 3 is ON - Default DIP 3 setting is ON)
BMS Modbus operating mode (Temp = Temp control, Rate
= Rate control)
Modbus slave address (not avail if Modbus Mode para =
OFF)
Modbus data type (not avail if Modbus Mode para = OFF)
Modbus parity (not avail if Modbus Mode para = OFF)
Modbus baud rate (not avail if Modbus Mode para = OFF)
on page 54.
Description
o
o
C to 82
C
53
Default
(Rqd)
51.5°C
2.5°C
(3ºC)
0:20 min
Monitor
1
RTU
Even
19200
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