Lochinvar MP2 Bedienungsanleitung PDF herunterladen (Seite 7)

LO / HIORLO / LO

When using multi-stage boilers, a selection must be made

regarding the staging order of the boiler(s). This adjustment

is made in the ADJUST menu of the control.

Lo / Hi

If the Lo/Hi staging option is selected the control stages in

sequence all of the stages in a single boiler. Once all of the

stages are turned on, the control then stages in sequence

all of the stages in the next boiler in the rotation sequence.

Lo / Lo

If the Lo/Lo staging option is selected, the control stages all

of the Lo stage outputs in all of the boilers first. Once all of

the boilers are operating on their Lo stages, the control then

operates the second stage in each boiler in the same order.

STAGING

The control operates up to nine stages to supply the

required temperature. After a stage is turned on in the firing

sequence, the control waits for the minimum time delay.

After the minimum time delay between stages has expired,

the control examines the control error to determine when

the next stage is to fire. The control error is determined

using Proportional, Integral and Derivative (PID) logic.

Proportional compares the actual supply temperature to

the boiler target temperature. The colder the supply water

temperature, the sooner the next stage is turned on.

Integral compares the actual supply temperature to the

boiler target temperature over a period of time.

Derivative compares how fast or slow the supply water

temperature is changing. If the supply temperature is

increasing slowly, the next stage is turned on sooner. If the

supply temperature is increasing quickly, the next stage is

turned on later, if at all.

FIRE DELAY

The Fire Delay is the time delay that occurs between the

time that the control closes a stage contact to fire a stage

and the burner fires for that stage. The fire delays for the

first and third stages in a boiler are adjustable using the

F DLY 1 and F DLY 2 settings. The fire delay for the sec-

ond and the fourth stages is fixed at 10 seconds, see Figure

10 below.

Fire Delay 1

Fire Delay 1 is available in all modes of operation. Fire

Delay 1 is the fire delay of the first stage of the boiler.

Fire Delay 2

Fire Delay 2 is only available in the modes of operation for

Three and Four Stage Boilers. Fire Delay 2 is the fire delay

of the third stage of the boiler.

FIG. 9

FIG. 10

1 2 3 4 5 6 7 8 9 10 11 12 ... 35 36

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