andrews MAXXflo EVO CWH 90/302 Installation And Maintenance Manual page 14

3.5 SySTEM SCHEMATIC EXAMPLES (CONTINuED)
EXAMPLES 1 & 2: SINGLE AND PARALLEL MAXXflo EVO (SETuP)
L N PE L N
Related settings table
Menu Parameter
DHW 1660
Pump release
1661
Pump cycling
1663
Circulation setpoint
Technical Data
E
L N
1 2 3 4
Settings
Set desired option for activation of the DHW circulation pump, normally either activated with
time program 4 (DHW) or independently of DHW via time program 5
When switched on, the circulation pump will cycle on and off during the activation period (on
for 10 minutes then off for 20 minutes repeatedly). This function is especially useful where
the heat losses on the return pipe work are high and the burner is operating continually for
long periods of time, with little or no DHW draw off.
Standard setpoint is 45
DHW return temperature during the activation time of the pump. Whenever the temperature
acquired by the sensor falls below the circulation setpoint, the pump is kept running until the
setpoint is reached (minimum on time is 10 minutes). During a legionella cycle operation the
temperature at the sensor is used to adjust the dwell time, ensuring that the entire DHW sys-
tem reaches the legionella setpoint for the total dwell time length set. The dwell time counter
is not started until the temperature at the sensor reaches legionella setpoint.
5 6 7 8
9
NO
C. When the B39 sensor is installed, the controller will monitor the
O
14
NO CO NC NO CO NC
CO NC
MAXXflo EVO