OPERATING SETPOINT ADJUSTMENT PROCEDURE
The system has a standard programmable Operating Setpoint range of 70 Degrees F to 190 Degrees F for a GW and of 70 Degrees F to 220 Degrees F for a GB for either tank or inlet probe depending on selection. The user can easily change the Operating Setpoint at any time by using the following procedure. When any configuration or setpoint is changed (and the Select key touched), the new value is IMMEDIATELY saved to
1.Touch the MENU key.
2.Scroll the ">" with the DOWN key next to the USER SETTING SCREEN.
3.Touch the SELECT key.
4.Scroll the ">" with the DOWN key until it is pointing to OPERATING SETPOINT.
5.Touch the SELECT key.
6.Use the UP or DOWN key to select the value you wish to enter.
7.Touch the SELECT key to accept and store the new value.
•High Limit:
The outlet temperature probe contains both an ECO switch and a thermistor for temperature measurement. The sensed outlet temperature is used for the automatically resettable High Limit setpoint. If the sensed outlet temperature exceeds the High Limit setpoint, a "soft lockout" condition will occur and the burner will be shut off. This fault condition is automatically cleared when the temperature drops below the high limit setpoint minus the high limit differential.
AUTO HIGH LIMIT SETPOINT ADJUSTMENT PROCEDURE/ OUTLET TEMP. PROBE
The High Limit setpoint has a range of 90 Degrees F to 210 Degrees F for a GW and a range of 90 Degrees to 235 Degrees F for a GB. Use the following procedure to change the automatically resettable High Limit Setpoint:
1.Touch the MENU key.
2.Scroll the ">" with the DOWN key next to USER SETTING SCREEN.
3.Touch the SELECT key.
4.Scroll the ">" with the DOWN key until it is pointing to HIGH LIMIT SETPOINT.
5.Touch the SELECT KEY.
6.Use the UP and DOWN key to select the value you wish to enter.
7.Touch the SELECT key to accept and store the new value.
•High Limit Differential:
The outlet temperature must be below the automatic High Limit setpoint minus the High Limit Differential setpoint before a call for heat can be generated.
HIGH LIMIT DIFFERENTIAL SETPOINT
ADJUSTMENT PROCEDURE
The High Limit Differential Setpoint has a range of 1 Degree F to 50 Degrees F for all models. Use the following procedure to change the High Limit Differential Setpoint:
1.Touch the MENU key.
2.Scroll the ">" with the down key next to USER SETTING SCREEN.
3.Touch the SELECT key.
4.Scroll the ">" with the DOWN key until it is pointing to HIGH LIMIT DIFFERENTIAL SETPOINT.
5.Touch the SELECT key.
6.Use the UP or DOWN key to select the value you wish to enter.
7.Touch the SELECT key to accept and store the new value.
•Operating Differential Setpoints:
Each of the two stages has an independent Operating Differential setpoint.
OPERATING DIFFERENTIALSETPOINT
ADJUSTMENT PROCEDURE
Each of the two stages has an independent Operating Differential Setpoint. The range of these setpoints is from 1 Degree F to 50 Degrees F for all models. Use the following procedure to change this setpoint:
1.Touch the MENU key.
2.Scroll the ">" with the DOWN key next to USER SETTING SCREEN.
3.Touch the SELECT key.
4.Scroll the ">" with the DOWN key until it is pointing to OPERATING DIFFERENTIAL SETPOINT.
5.Touch the SELECT key.
6.Scroll the ">" with the DOWN key until it is pointing to the STAGE you want.
7.Touch the SELECT KEY.
8.Use the UP and DOWN key to select the value you wish to enter.
9.Touch the SELECT key to accept and store the new value.
•Temperature Units:
Temperature can be displayed in either °F or °C units.
•Post Circulate Delay Time:
The time circulation pump will stay on after the burner is turned off. The time in seconds is adjustable with the following values: 45, 90, 180 or continuous. If the continuous value is selected the pump will remain on at all times and the post circulate state time will be set at 45 seconds.
•Network Address:
This is a unique number assigned to this boiler to differentiate it from other boilers or water heater on the same A. O. Smith proprietary network. A valid Network Address can be any number from 1 to 31. It is set by default to zero, which is an invalid address. The boiler will not communicate until it is changed to a valid and unique number. This prevents two units from trying to respond to the same request from the PC or supervisory network device.
•Configuration Settings Screen:
Displays the status of the dipswitches installed on all boards as described earlier.
•Log & System Info Screen: Displays the following information:
Elapsed hours of operation (Total time system has been powered up)
Number of running minutes (Number of minutes system has been in the run mode)
Number of cycles for each stage (Number of times stage has been in heat mode).
kBtu rating of the boiler (0 to 5750kBtu in 10kBtu increments) The software revision level of the CCB, and FCB microcontrollers.
Current Error Screen:
•Displays the last error that the system has detected plus a time stamp of when the error occurred. (The time stamp is based on the elapsed hours value at the time the error occurred. It is displayed in hours and minutes. This error remain displayed as long as it is still valid. When cleared it is moved to the Error History Screen. The system will automatically jump to this screen
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