Lochinvar MP2 Bedienungsanleitung PDF herunterladen (Seite 5)

COMBUSTION AIR OR ALARM CONTACT

The control has an isolated contact that can be used as

either a combustion air damper contact or an alarm contact.

This selection is made using the C. A. / Alarm DIP switch.

Combustion Air (C. A.)

When the DIP switch is set to C. A., terminals 12 and 13 can

be used as a switch to operate a combustion air damper.

This contact closes prior to the first stage operating on the

control. The amount of time that the contact closes prior to

the first stage operating is set using the combustion delay

setting. The combustion air contact remains closed for a

minimum of 15 seconds after the last stage is turned off.

Alarm

When the DIP switch is set to Alarm, terminals 12 and 13

can be used as a switch to operate an alarm circuit. This

contact closes whenever an error message is present on

the control. When the alarm contact is activated, refer to the

Error Messages section of this manual to determine the

cause of the alarm. Once the fault has been fixed, the alarm

can be cleared by pressing either the Menu, Item, up arrow

or down arrow button.

Boiler Alarm

The control can monitor the boiler supply temperature and

provide an alarm if the temperature does not increase with-

in a certain amount of time. The amount of time can be set

using the Boiler Alarm setting. This alarm can be used to

determine if the boilers have failed to fire. To reset the

alarm, press and hold the up and down arrow buttons for 5

seconds while in the VIEW menu.

ROTATION

The control's Equal Run Time Rotation function is fixed at

48 hours. The firing order of the boilers change whenever

one boiler accumulates 48 hours more running time than

any other boiler. After each rotation, the boiler with the least

running hours is the first to fire and the boiler with the most

running hours is the last to fire. This function ensures that all

the boilers being rotated receive equal amounts of use.

When the Rotate / Off DIP switch is set to the Off position,

the firing sequence always begins with the lowest boiler to

the highest boiler, see Figure 7 below.

Fixed Lead Rotation

In some applications, it may be desirable to have the first

boiler fire first at all times while the firing sequence of the

remaining boilers is changed using Equal Run Time

Rotation. This rotation option is selected by setting the

Fixed Lead / Off DIP switch to the Fixed Lead position.

First On / Last Off or First On / First Off

When using the Fixed Lead rotation option, a selection must

be made between First On / Last Off and First On / First Off

using the DIP switch. When First On / Last Off is selected,

the lead boiler is always staged on first and staged off last.

When First On / First Off is selected, the lead boiler is

always staged on first and staged off first. This DIP switch is

only read by the control when the Fixed Lead / Off DIP

switch is set to Fixed Lead.

Fixed Last

In some applications, it may be desirable to have the last

boiler fire last at all times while the firing sequence of the

remaining boilers is changed using Equal Run Time

Rotation. This rotation option is selected by setting the

Fixed Last / Off DIP switch to Fixed Last. With a fixed last

rotation, the last boiler is the last to stage on and the first to

stage off.

FIG. 6

FIG. 7

1 2 3 4 5 6 7 8 9 10 ... 35 36

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