Lochinvar 000 through 2 - Manual (Page 39)

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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 tear-off label on the new Excel 10 must be placed
over this label on the back of the unit for easy ref er ence.
The Excel 10 may have values for the control points specified at the
time the control is configured at the fac to ry. If exact control
settings are not specified at the time an appliance is ordered, the
Excel 10 controller will be pre-programmed with the fol low ing
default values as shipped from the factory. Special arrangements
should be made with the factory during the ordering process to have
job site spe cif ic values programmed into the con trol. These values
are different for boiler and water heater applications.
TABLE - S
Default Values
Pre-programmed in the Excel 10
Point
_______________
Setpoint Temp
_______________
O.A. Lockout
_______________
O.A. Max
_______________
O.A. Min
_______________
Max Setpoint
_______________
Min. Setpoint
_______________
Operating Sensor
_______________
Heater I.D.
Water Heater
_______________
120.0°F
_______________
N/A
_______________
N/A
_______________
N/A
_______________
190.0°F
_______________
50.0°F
_______________
Return/Inlet
_______________
Water Heater
Boiler
_______________
130.0°F
_______________
70.0°F
_______________
60.0°F
_______________
10.0°F
_______________
220.0°F
_______________
100.0°F
_______________
Return/Inlet
_______________
Boiler
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.
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 3-pin wire harness from its
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.
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
3-pin bypass wire harness.
To Return to the Primary Control:
1. After the replacement primary control is installed, reconnect
the 3-pin bypass wire harness.
2. Move the toggle switch to “Primary Control”.
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 1-800-722-2101.
TEMPERATURE ADJUSTMENT
COMMAND DISPLAY
FIG. 54 Command Display Panel