11
Greenstar FS/Combi FS – 6720810589 (2021/01)
Prepare for operation
2.3 Overview of boiler types
Table describes the meaning of the model number:
KBR21-3 Heat only appliance A
23
KBR28-3 Heat only appliance A 23
KBR35-3 Heat only appliance A
23
KBR42-3 Heat only appliance A 23
KWB28-3 Combi appliance A
23
KWB35-3 Combi appliance A 23
KWB42-3 Combi appliance A 23
Table 2 Appliances types
K Floor standing heating appliance
W DHW heating
B Condensing technology
R Constant temperature control
21..42 Output in kW. 42kW = 143 310BTU/hr
-3 Version
A Fan-supported appliance
23 Natural gas (NG)
3 Prepare for operation
▶ If existing, open the heating supply valve and the heating return valve.
▶ if existing, open the cold water valve and the DHW valve.
▶ When using KBR..-3A appliance with DHW tank, open a DHW tap until water run
out.
▶ Open the gas cock
▶ Open the control cover.
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