Lochinvar MP2 Bedienungsanleitung PDF herunterladen (Seite 9)

BOILER PUMP OPERATION

In certain modes of operation, the control can operate the

individual boiler pumps on each boiler in addition to the pri-

mary pump. The boiler pump turns on prior to the boiler fir-

ing and continues to run after the boiler is turned off. The

amount of time that the boiler pump turns on prior to the

boiler firing is determined by the BOIL MASS setting. If a

BOIL MASS of Lo is selected, the boiler pump turns on 15

seconds prior to the boiler. If a BOIL MASS of Medium is

selected, the boiler pump turns on 22 seconds prior to the

boiler. If a BOIL MASS of Hi is selected, the boiler pump

turns on 30 seconds prior to the boiler. However, if the con-

trol is operating based on a set point demand, the boiler

pump turns on 5 seconds prior to the boiler, see Figure 13.

Boiler Pump Purge

The amount of time that the boiler pump continues to run

after the boiler turns off is adjustable using the boiler pump

purge setting (PURG Boil Pmp).

SECTION D: BOILER RESET OPERATION

ECTION D1: BOILER RESET (STAND ALONE)

BOILER DEMAND

When operating in the stand-alone mode, a boiler demand

is required in order for the control to provide heat to the

heating system. A boiler demand is generated by applying

a voltage between 24 and 230 V (ac) across the Boiler

Demand and Common Demand terminals (6 and 7)

(FIG. 14). Once voltage is applied, the Boiler Demand

pointer is displayed in the LCD. If the control is not in

WWSD, the control closes the primary pump contact. The

control calculates a boiler target supply temperature based

on the outdoor air temperature and the characterized heat-

ing curve settings.

BOILER TARGET TEMPERATURE

The boiler target temperature is determined from the char-

acterized heating curve settings and the outdoor air tem-

perature. The control displays the temperature that it is cur-

rently trying to maintain as the boiler supply temperature. If

the control does not presently have a requirement for heat,

it does not show a boiler target temperature. Instead, "- - -"

is displayed in the LCD.

CHARACTERIZED HEATING CURVE

The control varies the supply water temperature based on

the outdoor air temperature. The control takes into account

the type of terminal unit that the system is using. Since dif-

ferent types of terminal units transfer heat to a space using

different proportions of radiation, natural convection and

forced convection, the supply water temperature must be

controlled differently. Once a terminal unit is selected, the

control varies the supply water temperature according to the

FIG. 12

FIG. 13

FIG. 14

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 35 36

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