53
Fig. 23: W Models - Master/Slave with Tank
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
o
C - ADJUST Menu Settings
•
'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
Description
Default
(Rqd)
Tank
Setpoint
10.0 ~ 71.0°C
Tank setpoint (only avail if Modbus Mode = Off or Monitor)
51.5°C
Tank Diff
1.0~ 5.0°C
Differential for Target Setpoint .i.e. 2.5°C diff = CFH at
2.5ºC below Target Setpoint & CFH end at Target Setpoint
2.5°C
(3ºC)
System
Purge
Time
OFF,
0:20 ~ 20:00 min
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)
0:20 min
Modbus
Mode
Off, Monitor, Temp,
Rate
BMS Modbus operating mode (Temp = Temp control, Rate
= Rate control)
Monitor
Address
1 ~ 170
Modbus slave address (not avail if Modbus Mode para =
OFF)
1
Data Type
RTU, ASCH
Modbus data type (not avail if Modbus Mode para = OFF)
RTU
Parity
None, Odd, Even
Modbus parity (not avail if Modbus Mode para = OFF)
Even
Baud Rate
2400, 9600, 19200,
57600, 115000
Modbus baud rate (not avail if Modbus Mode para = OFF)
19200
H Models
– Direct Domestic Hot Water Configuration 72
o
C to 82
o
C
on page 54.
