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Series 8900SH Control Panel Operation And Installation Manual
Section 8 Entry Code Details
ENTRY CODE 22: MINIMUM RETURN WATER TEMPERATURE SETTING
PRESS + = ENTRY CODE
ENTER YOUR CHOICE
PRESS = SAVE KEY
FOR A MINIMUM RETURN WATER TEMPERATURE SETTING OF 100°F.
THE AVAILABLE RANGE IS + 50°F to + 190°F
This code allows the panel to set and monitor a minimum allowable boiler system Return
Water Line temperature. When the outside temperature drops below the setting in code 21,
the control panel will maintain a minimum of 100°F in the boiler system return line.
ENTRY CODE 23: OUTDOOR RESET RATIO SETTING
(AUTOMATIC CALCULATION)
PRESS + = ENTRY CODE
ENTER YOUR CHOICE
PRESS = SAVE KEY
The above setting of "0” is entered when you want the computer to automatically calculate the
outdoor Reset Ratio setting. This calculation will be displayed in monitor code No. 15.
ENTRY CODE 23: OUTDOOR RESET RATIO SETTING
(MANUAL CALCULATION)
PRESS + = ENTRY CODE
ENTER YOUR CHOICE
PRESS = SAVE KEY, FOR A RESET RATIO OF 1.00.
THE AVAILABLE RESET RATIO DEGREE RANGE IS -.10 TO 2.50
This code allows for manual fine tuning of the boiler system to the requirements of the
building’s host system. As an example, assume it is 60°F degrees outside and that 100°F
water is needed in the system Return Water Line. As night approaches and the temperature
begins to drop, the 100°F Return Water will not keep the building warm. So, as the outside
temperature drops one degree, the control panel senses this and increases the Return Water
Line temperature by the ratio amount. If the ratio is set at 1.00, as in the example above, for
2
2
1
0
0
#
2
3
0
#
2
3
1.
0
0
#