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is unique to each Excel 10 and must be placed into the network of an energy management system so that the Excel 10 can be recognized by the system. NOTE: If the Excel 10 is ever replaced, a
The Excel 10 may have values for the control points specified at the time the control is configured at the factory. If exact control settings are not specified at the time an appliance is ordered, the Excel 10 controller will be
TABLE - S
Default Values
Pre-programmed in the Excel 10
To Activate the Manual Override:
1. In the event of a failure of the primary control, move the |
“Stop/Run” switch on the front of the control panel to “Stop”. |
2. Move the toggle switch, located on the back of the unit to |
“Manual Override”. |
3. If the bypass valve does not modulate under the control of the |
manual override thermostat, it will be necessary to manually to |
set the bypass valve to deliver a minimum 140°F water |
temperature to the primary heat exchanger following the |
procedure below: |
a. Disconnect the bypass valve’s |
connection in the junction box on the upper left of the rear |
of the appliance. |
b. If the Excel 10 readout function is still active, check the |
“Return/In Temp” for a return water temperature the unit |
might see in regular operation. |
c. Press the “Down” or “Up” arrow key to find the “Bypass |
Temp” readout. |
Point
_______________
Setpoint Temp
_______________
O.A. Lockout
_______________
O.A. Max
_______________
O.A. Min
_______________
Max Setpoint
_______________
Min. Setpoint
_______________
Operating Sensor
_______________
Heater I.D.
Boiler
_______________
130.0°F
_______________
70.0°F
_______________
60.0°F
_______________
10.0°F
_______________
220.0°F
_______________
100.0°F
_______________
Return/Inlet
_______________
Boiler
Water Heater
_______________
120.0°F
_______________
N/A
_______________
N/A
_______________
N/A
_______________
190.0°F
_______________
50.0°F
_______________
Return/Inlet
_______________
Water Heater
d. Fire the unit with the manual override control. As the unit |
reaches a steady state operation, depress the clutch |
mechanism and turn the handle slowly counterclockwise to |
open the bypass valve to a point at which the “Bypass |
Temp” is 140°F. |
e. Release the clutch and leave the valve in this position until |
the primary control can be replaced. Do not reconnect the |
To Return to the Primary Control:
1. | After the replacement primary control is installed, reconnect |
| the |
2. | Move the toggle switch to “Primary Control”. |
MANUAL OVERRIDE CONTROL
This unit is trimmed with an auxiliary thermostat to provide a manual override in the event of a failure of the Sequencer Control or the Excel 10. When the manual override is activated, it will provide temporary control until a replacement Sequencer or Excel 10 can be installed.
The manual override fires the appliance at 100% Btu/hr input rate during the entire cycle. Modulating burner control is not available with the manual override. In addition, the pump will run continuously. Intermittent pump operation is not available with the manual override.
Modulation of the bypass valve may not be available with the manual override. If the primary control failure is in a remote Sequencer, the bypass valve should modulate. If the Excel 10 inside the appliance has failed, the bypass valve may not modulate.
The manual override is located on the back of the appliance below the bypass piping loop. To the left of the thermostat is a toggle switch to alternate the control of the appliance from the primary control to the manual override thermostat.
Some models may have a reduced firing rate when manual override is activated.
3. | Turn the manual override thermostat to the lowest setting. |
4. | Move the “Stop/Run” switch to “Run”. |
If you have any questions or comments, please call the Lochinvar Technical Product Service Line at
TEMPERATURE ADJUSTMENT
COMMAND DISPLAY
FIG. 54 Command Display Panel
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