Lochinvar MP2 - Manual (Page 6)

Resetting the Rotation Sequence
To reset the rotation sequence, set the Rotate / Off DIP
switch to the Off setting for 5 seconds and then return the
DIP switch to the Rotate setting.
R UNNING T IMES
The control displays the accumulated running time of each
boiler in the VIEW menu. When using a multi-stage boiler,
the running time that is displayed is the total number of run-
ning hours of the Lo stage of the boiler.
Resetting the Running Times
To reset the running time for each boiler, select the appro-
priate running time in the VIEW menu. Next, press the up
and down arrow buttons simultaneously until CLR is dis-
played.
E
XERCISING
The control has a built-in exercising feature that is selected
through the Exercise / Off DIP switch. To enable the exer-
cising feature set the Exercise / Off DIP switch to Exercise.
If exercising is enabled, the control ensures that each pump
is operated at least once every 3 days. If a pump has not
been operated at least once every 3 days, the control turns
on the output for 10 seconds. This minimizes the possibility
of the pump seizing during a long period of inactivity. While
the control is exercising, the Test LED flashes quickly.
Note: The exercising function does not work if power to the
control or pumps is disconnected.
R ELOADING F ACTORY D EFAULTS
To reload the factory defaults, power down the control for 10
seconds. Power up the control while simultaneously hold-
ing the Menu and down arrow buttons. The control will now
display the E01 error message. To clear this error message,
follow the procedure in the Error Messages section of this
manual.
B OILER M INIMUM
The boiler minimum is the lowest temperature that the con-
trol is allowed to use as a boiler target temperature. During
mild conditions, if the control calculates a boiler target tem-
perature that is below the BOIL MIN setting, the boiler tar-
get temperature is adjusted to at least the BOIL MIN setting.
During this condition, if the boiler(s) is operating, the mini-
mum segment is turned on in the display when viewing
either the boiler supply temperature or the boiler target tem-
perature. Set the BOIL MIN setting to the boiler manufac-
turer's recommended temperature.
B OILER M AXIMUM
The boiler maximum is the highest temperature that the
control is allowed to use as a boiler target temperature. If
the control does target the BOIL MAX setting, and the boil-
er temperature is near the boiler maximum temperature, the
maximum segment will be displayed in the LCD while either
the boiler target temperature or the boiler supply tempera-
ture is being viewed. At no time does the control operate
the boiler(s) above 248°F (120°C).
SECTION B: STAGING OPERATION
S ECTION B1: S TAGING
Mode
The control is capable of staging single stage, two stage,
three stage or four stage on / off heat sources. In certain
modes of operation the control is capable of controlling the
individual boiler pumps. The control has 8 modes of opera-
tion based on the type of staging and pump operation that
is desired. The following describes the modes of operation:
Mode 1: 9 Single Stage Boilers and a primary pump.
Mode 2: 4 Single Stage Boilers with individual boiler pumps
and a primary pump.
Mode 3: 4 Lo/Hi boilers and a primary pump.
Mode 4: 3 Lo/Hi boilers with individual boiler pumps and a
primary pump.
Mode 5: 3 Three Stage Boilers and a primary pump.
Mode 6: 2 Three Stage Boilers with individual boiler pumps
and a primary pump.
Mode 7: 2 Four Stage Boilers and a primary pump.
Mode 8: 1 Four Stage Boiler with a boiler pump and a pri-
mary pump.
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FIG. 8