Burnham ALP150 Specifications download pdf (Page 72)

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XII. Operation

A. The Alpine (ALP) boiler uses a microprocessor based

Honeywell control, known as a “MCBA”, to manage

all boiler functions including ame supervision and

modulation. Two set point or “target” boiler supply

temperatures are stored in the MCBA’s memory;

one for space heating and one for domestic water

production. If an outdoor temperature sensor is

connected to the boiler, the space heating supply set

point will automatically adjust downwards as the

outdoor temperature increases. For more information

on this feature see the discussion on boiler water reset

below.

The MCBA modulates the boiler input by varying the

fan speed. As the fan speed increases, so does the

amount of gas drawn into the blower. As a result, a

fairly constant air-fuel ratio is maintained across all

inputs.

The MCBA determines the input needed by looking

at both current and recent differences between the

supply temperature and the set point temperature.

As the supply temperature approaches the set point

temperature, the fan will slow down and the input drop.

Depending on the model boiler, the minimum input

is between 1/3 (high altitude) and 1/5 (sea level) of

maximum input.

The MCBA also monitors boiler return and ue

temperatures. In addition, all other safety controls,

including the low water cut-off and safety limit, are

connected into the MCBA. The MCBA uses input from

all of these controls to either shut down the boiler when

an unsafe condition exists or, in some cases, to correct

the problem.

B. The display panel has three primary modes of

operation. These are:

1. Standby Mode – Displays boiler’s current status.

This is the default operating mode.

2. Parameter Mode – Used to change control settings

3. Information Mode – Displays boiler operating

temperatures

Under normal conditions, the boiler is in standby mode

and the display looks like that shown in Figure 49. The

three digits to the right of the decimal point are the

boiler’s supply temperature. The digit to the left of the

decimal point is the boiler’s status code. A list of status

codes, and their meanings, is shown in Table 26.

Figure 50 is a map of the menu structure for the control

panel. Push the mode key to move from one mode

to the next. As you change modes, the mode you are

entering is shown on the display:

a. “PArA” for Parameter Mode

b. “Info” for Information Mode

c. “Stby” for Standby Mode. Upon entering

standby mode, “Stby” will briey appear on

the display and then the display will show the

boiler’s status along with the supply temperature

(Figure 49).

The

control will return to standby mode from any

other mode if no key is pressed for 20 minutes.

Figure 49: Normal Display In Standby Mode

C. In standby mode, it is possible to view both the

heating supply set point temperature and the “domestic

hot water reference set point”. The “domestic hot

water reference set point” plus 45°F equals the boiler

supply set point when it is responding to a call from

the indirect water zone. It is not the actual domestic

hot water set point. The Alpine (ALP) is designed

for use with a storage type indirect water heater such

as the Alliance SL™. The domestic water set point

is controlled by the thermostat on the indirect water

heater. The “default domestic water reference set point”

is 135°F and target boiler supply temperature when

responding to a call from the indirect water heater is

therefore 180°F (135°F +45°F). The default heating

supply set point (parameter 4) is 180°F.

In standby mode it is also possible to turn on or off

either the heating or domestic water zone. There is

normally no reason to turn off either of these zones and

doing so is not recommended.

WARNING

Pushing and holding the “+” while in Standby

Mode will prevent the boiler from responding to

a call for heat. Pushing and holding the “-” while

in Standby Mode will prevent the boiler from

responding to a call for domestic water. If this

happens, “cOFF” or “dOFF” will appear on the

display. To turn back on the heating function,

press and hold “+” until “c” and the set point

temperature appears on the display. To turn back

on the domestic water function, press and hold “-”

until “d” and the set point temperature appears on

the display. After pressing any keys, and before

leaving the installation, verify that the boiler res

in response to a call for heat and domestic water.

I. Factory Preset Boiler Operating Parameters

(See Table 25 for Parameter Descriptions)

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Burnham ALP150 Specifications Page 72

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