57
Fig. 27: MODE 1 - Master/Slave with Primary/Secondary Piping
Operational Settings
•
Operation Mode parameter in ADJUST menu must be set to 1 (refer to
on page 57 for parameter settings and
on page 88).
•
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 90ºC (194ºF) 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.
Mode 1 for Hydronic Systems without DHW
– ADJUST Menu Settings
•
'Default' column shows factory default settings. Actual values will depend on installation. Required
(Rqd) values shown bracketed in bold must not be exceeded.
•
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)
Operation
Mode
1, 2, 3
Selects heater operating mode
1
Target Mode
SETP, RSET,
EMS, Modbus
SETP = Setpoint
RSET = Outdoor Reset (outdoor air compensation)
EMS = Energy Management System (if PIM DIP switch 5 is
ON - Default DIP 5 setting is OFF)
Modbus only if Modbus Mode para = Temp or Rate)
SETP
Target
Setpoint
10.0 ~
115.0°C
Target setpoint (only avail if Target Mode para = SETP)
82.0°C
(80ºC Max)
Target Max
32 .0~
110.0°C
Max heating value for indirect DHW @ 10.0vdc input when
Target Mode para = EMS or Modbus
98.0°C
(82.0ºC Max)
Target Min
10.0 ~ 82.0°C
Min heating value for indirect DHW @ 1.0vdc input when
Target Mode para = EMS or Modbus
10.0°C
