Technical data

STRATA1

a) If direct-on-boiler weather compensated flow temperatures are required, then ensure the

(supplied) outside air temperature sensor has been installed and Dip switch No2 has been set to

“on”.

The boiler is supplied with the compensation slope shown overleaf set as a default.

NOTE: The default slope is obtained when the red and blue potentiometers are set in the vertical position.

b) If the default settings are not applicable to the needs of the system user, then the angle of the

slope may be changed by adjustment of either the blue or red potentiometers or both.

Adjustment of the red potentiometer raises or lowers the flow temperature at low outside (design)

air temperature.

Adjustment of the blue potentiometer raises or lowers the flow temperature at the end point (high)

outside air temperature.

Each potentiometer has the range of +20ºC and -20ºC about the default point but with a limiting

factor that the maximum flow temperature is 85’C.

See graphs following showing range of parallel displacement of the compensation slopes.

19.3 First Firing (contd)

19.4. Setting Weather

Compensation

NOTE: Test period expires after 10 minutes - if this expires whilst commissioning is still in progress,

press Engineers button twice to reset and carry on with necessary checks and adjustments. To exit “10

min Low” test period - press Engineers button once, this will set controls to auto.

h) Turn the green potentiometer (whilst still in “10 min Low” operation) fully anti-clockwise (20ºC).

This will set the burners to maximum output.

i) Check CO

% of upper heat exchanger and adjust as necessary screw (4) Q max of right hand

valve, to obtain required value. (See table 1)

NOTE: Adjustment of either (3) Q min or (4) Q max will affect the other adjustment to a lesser or

greater extent. Following either adjustment of (3) or (4) check the effect on the setting of the other

adjustment and correct as necessary.

j) Remove analyser from upper heat exchanger and refit cap/plug to test point.

k) Repeat operations described in i) and j) but on lower heat exchanger and left hand gas valve.

l) Press Engineer ’s test button once to exit 10 minute test mode.

m) Turn off electricity and gas supplies and remove manometer from inlet pressure test point and

refit test point screw.

n) Turn on gas and electricity supplies.