tekmar 257 DHW Control - Manual (Page 10)

© 2009 D 257 - 03/09 10 of 12
Program Menu
Item Field Range Description Actual Setting
Stage Mode Delay
Target DHW
Differential DHW
70 to 190°F
(21 to 88°C)
Default = 140°F
(60°C)
TARGET DHW
The DHW tank target temperature.
Stage Mode Delay
Target DHW
Differential DHW
AU, 1 to 42°F
(Au, 1 to 23°C)
Default = Au
DIFFERENTIAL
The differential the control will use when
operating the boilers in PID mode.
(Stage Mode is set to PID)
Stage Mode Delay
Target DHW
Differential DHW
1 to 42°F
(1 to 23°C)
Default = 2°F
(1°C)
DIFFERENTIAL 1
The differential the control will use for
the turn on point of the Heat 1 relay (all
below target DHW).
(Stage Mode is set to P)
Stage Mode Delay
Target DHW
Differential DHW
1 to 42°F
(1 to 23°C)
Default = 2°F
(1°C)
DIFFERENTIAL 2
The differential the control will use for
the turn on point of the Heat 2 relay (all
below Differential 1).
(Stage Mode is set to P)
Stage Mode Delay
Target DHW
Differential DHW
0:00 to 19:50
minutes
Default = 00:30
DELAY
The minimum time delay between the
operation of stages.
(Stage Mode is set to P)
Stage Mode Delay
Target DHW
Differential DHW
PID, P
Default = PID
STAGE MODE
Selects the mode of operation for
staging.
Stage Mode Delay
Target DHW
Differential DHW
°F, °C
Default = °F
UNITS
The units of measure that all of the
temperatures are to be displayed in the
control.
PROGRAM MENU
After the last item, the control returns to the first item in the menu.
The Program menu items are the programmable settings
used to operate the system. Press and hold all three
buttons simultaneously to enter the Program menu.
Item Item
Change Value Next Item Enter Program Menu