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Firebird C35 Condensing Boiler

Sheryl1971 · 2024-06-06 03:44:20

I have a C35 condensing boiler operating 1 manifolds around 18 kw, 1 manifold around 11kw, 11 radiators, 4 towel rails & trench heating. My issues are as follows 1: Boiler overheats 2: Boiler struggles to get to set point and if finally reaches set point, flow will increase by 10C 3: Boiler cycles on and off every 2 mins…

06-06-2024 3:44am

#1

Sheryl1971

Registered Users, Registered Users 2 Posts: 12 ✭

Join Date: July 2022

Posts: 10

I have a C35 condensing boiler operating 1 manifolds around 18 kw, 1 manifold around 11kw, 11 radiators, 4 towel rails & trench heating. My issues are as follows
1: Boiler overheats
2: Boiler struggles to get to set point and if finally reaches set point, flow will increase by 10C
3: Boiler cycles on and off every 2 mins
4: Boiler blows water out the condensate pipe, dries out the trap and melts the condensate pipe.
5: On the flue analyser the settings are as follows: Danfoss nozzle .65 80S, 12 Bar, Air 5, CO2 12% flue gases 134C, excess air 43%.
Can anyone help me as to what is causing all these issues please. UFH manifolds run 80% of the time there is no buffer tank of LLH on the system.

Post edited by Spear on July 1

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