RBI FUTERA III Series Instruction Manual download pdf (Page 16)

Version 3.37 – Control Board Manual used for Futera III, Futera Fusion and Futera XLF

ers

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XLF

Setting Up Base Loading

 e base load boiler is controlled using a set of contacts to enable

it (location J4). Enabling/Disabling this relay contact can be done

using any combination of (3) quali ers to start the boiler and (4)

to stop the boiler.  ese quali ers are:

1. Modulation %:

a. START menu item:  e relay contact will close

when the MOD % from the Master boiler exceeds

this value. ADVANCE SETUP:BASE LOADING:

START>MOD

b. STOP menu item:  e relay contact will open

when the MOD % from the Master boiler falls below this

value. ADVANCE SETUP:BASE LOADING:

STOP<MOD

If the START>MOD value is set to a value higher than

the ADVANCED SETUP:MOD-MAX: all boilers

will be  ring before this modulation rate is reached.  is

will ensure that all available boilers are  ring before the

base load boiler relay is enabled.

2. Outside Air Temperature:

a. START menu item:  e relay contact will close to

enable the boiler when the OA T read from the Outside

Air Temperature sensor (if Equipped) falls below this

temperature. ADVANCE SETUP:BASE LOADING:

START< OA T

b. STOP menu item:  e relay contact will open to

disable the boiler when the OA T read from the Outside

Air Temperature sensor (if equipped) rises above this

value. ADVANCE SETUP:BASE LOADING:

STOP> OA T

If the OA T quali er is used as the Start and Stop

quali er, ensure that there is at least a few degrees

di erence for hysteresis.

c. Se ing the : STOP<MOD to a % value slightly above the

min  re rate % of the system will ensure that the base load

boiler will stop before the  rst condensing boiler stops.

 is is due to the Modulation rate being close to the min

modulation rate before the water temperature exceeds the

top of the heating band.

Figure 19 Base Loading Relay

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RBI FUTERA III Series Instruction Manual Page 16

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