Installation

ManualsBrandstekmar ManualsSensors364 Universal Reset Control

BOILER SENSOR ON THE SUPPLY (Boil SENS = SUP)

The boiler sensor can be located on the boiler supply if the 364 is the only control that is

operating the boiler. When in the supply mode, the 364 determines the required operat-

ing temperature for the boiler supply and cycles the Boiler contact to maintain the correct

supply water temperature.

BOILER TARGET TEMPERATURE (Boil TRG)

The Boil TRG temperature is determined from the demands that currently require heat. The boiler target temperature is set at least

as high as the requirements of the highest temperature requirements of the current demands. The control displays the temperature

that it is currently trying to maintain as the boiler supply temperature in the Boil TRG item in the View menu. If the control does not

presently have a requirement for heat, it displays “---” in the LCD.

BOILER MINIMUM (Boil MIN)

The Boil MIN is the lowest water temperature that the control is allowed to use as a Boil TRG temperature. During mild conditions,

if the 364 calculates a Boil TRG temperature that is below the Boil MIN setting, the Boil TRG temperature is adjusted to at least the

Boil MIN setting. During this condition, if the boiler is operating, and the boiler supply temperature is near the Boil MIN setting, the

Min / Max pointer turns on in the LCD while the Boil TRG or the Boil SUP temperature is viewed. If the installed boiler is designed

for low temperature operation, set the Boil MIN adjustment to OFF.

BOILER MAXIMUM (Boil MAX)

The Boil MAX is the highest water temperature that the control is allowed to use as a Boil TRG temperature. If the control does target

Boil MAX, and the Boil SUP temperature is near the Boil MAX temperature, the Min / Max pointer turns on in the LCD while the Boil

TRG or the Boil SUP temperature is viewed. At no time does the control operate the boiler above 248°F (120°C).

DIFFERENTIAL (Boil DIFF)

An on / off heat source such as a boiler must be operated with a differential to prevent short cycling. This differential is centered

around the Boil TRG temperature. If the boiler supply temperature drops 1/2 of the differential setting below the Boil TRG tempera-

ture, the 364 closes the Boiler contact to fire the boiler. If the boiler supply temperature rises 1/2 of the differential setting above the

Boil TRG temperature, the 364 opens the Boiler contact to turn off the boiler. With the 364, either a fixed or automatic differential

setting is selected. If the AUTO differential is selected, the 364 automatically adjusts the boiler differential setting under the current

load conditions to minimize short cycling.

FIRE DELAY (FIRE DLY)

The FIRE DLY is the delay time that may happen between the time that the 364 closes the Boiler contact and the burner fires. This

delay is usually the result of a burner pre-purge or other forms of time delay built into the burner’s safety circuits.

BOILER MASS (Boil MASS)

The Boil MASS setting allows the 364 to adjust to different types of heat sources depending on their thermal mass.

Light (LITE)

The LITE setting is selected if the boiler that is being used has a low thermal mass. This means that the boiler has a very small

water content and has very little metal in the heat exchanger. A boiler that has a low thermal mass comes up to temperature

quite rapidly. This is typical of many copper fin-tube boilers.

Medium (MED)

The MED setting is selected if the boiler that is being used has a medium thermal mass. This means that the boiler either has

a large water content and a low metal content or a low water content and a high metal content. This is typical of many modern

residential cast iron boilers.

Heavy (HEVY)

The HEVY setting is selected if the boiler that is being used has a high thermal mass. This means that the boiler has both a large

water content and a large metal content. A boiler that has a high thermal mass is relatively slow in coming up to temperature.

This is typical of many commercial cast iron and steel tube boilers.

Section F: Boiler Operation

Section F1: Boiler Supply Sensor

Section F1

Boiler

Supply

Sensor

Section F2

Boiler

Return

Sensor

Section F3

Boiler

Sensor