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  1. cr0ft

    Trouble with single pipe system

    It’s very common to have leaks that only happen when above a certain pressure level.
  2. cr0ft

    Trouble with single pipe system

    My thoughts on this are that the expansion vessel probably isn't the culprit here. If the expansion vessel was too small you'd expect to see a very significant pressure spike as the system warms up. Unless I've missed it, you don't say you are getting a pressure increase as the system is...
  3. cr0ft

    Press fit....... Good or bad

    A few years back when I was running my business I looked at one of these tools. I decided not to buy one as my work was mainly domestic at the time and I couldn't justify the outlay. Unless the domestic market has changed significantly in the last 3 years you can't pass extra costs on easily...
  4. cr0ft

    Is the boiler big enough?

    22mm pipework has a heat capacity of 40.2KW so the 28mm pipework is unnecessary in my humble opinion. This is one of three things: - 1.) Blocked/incorrectly sized pipework. 2.) Pump not powerful enough (unlikely as the pumps in boilers are usually sized to be generous enough that you don't...
  5. cr0ft

    Commercial Boiler Install Minimum Efficiencies

    Yes Imax boilers. The district heating network provides hot water on demand for the flats too via the plate heat exchangers in the houses (8 student bedrooms per house). Efficiency is currently 50% through the Summer rising to 70% in Winter, I'd be better getting the engineers to rip out the...
  6. cr0ft

    Commercial Boiler Install Minimum Efficiencies

    Hi all, my employer took on a new build property which was built for them last year. There are 4x 480KW Ideal condensing boilers installed to serve a district heating network serving approx. 560 student apartments. Due to a lack of decent control, these boilers are achieving a seasonal...
  7. cr0ft

    BMS Controllable Commercial Boiler with High Modulation Ratio

    Cheers Shaun. Am I missing something? I took a look and their modulation ratios appear to be 6.5:1 and 5:1 respectively. With 9:1 and above we believe we can save a boiler in our existing 4 boiler buildings when we come to renew.
  8. cr0ft

    BMS Controllable Commercial Boiler with High Modulation Ratio

    Hi all, hope everyone is keeping well. I was wondering if anyone can help me work out the best boiler to cover this: - 1.) Modulation ratio of 9:1 or higher. 2.) BMS controlled modulation via 0-10v signal. 3.) BMS feedback re boiler modulation via 0-10v signal. 4.) A reliable boiler too...
  9. cr0ft

    Control of AHU Pre-Heat Coil

    Haha!!
  10. cr0ft

    Control of AHU Pre-Heat Coil

    This AHU uses a thermal wheel across supply and extract ducts. Problem is, as the pre-heat control valve is passing so much, the thermal wheel isn’t coming on but the chiller system is then chilling the hot air after the pre-heat. Such a waste of energy. The current setup works to a degree...
  11. cr0ft

    Control of AHU Pre-Heat Coil

    Yup that's my thought as well. As we need to replace both valves which means draining down that leg it's a no brainer to me to fit a 3 port mixing valve on each one.
  12. cr0ft

    Control of AHU Pre-Heat Coil

    Hi all, I've got 2x AHUs where I work with pre-heat coils after the filter on the supply ducting. These are heated using the boiler CT circuit. On both of these AHUs the method of control of heat to the coil is a 3 port mixing/diverting valve with the central port blanked off. There doesn't...
  13. cr0ft

    Potentially being taken to court. What should I do?

    Hi Armyash. Read this one with interest. I no longer run my business and am back in full time employment so can chat about this quite candidly now. When running my business I once had to solder a gas pipe in a really awkward space, too tight to even get a mirror round to inspect the joint...
  14. cr0ft

    Spillage on inside of case (Worcester Greenstar 24i System, 2001)

    Yes, 10.3% CO and 0.002 with 125 parts CO on max rate. Ratio down to 0.0005 with new Case seal so something was going on for sure.
  15. cr0ft

    Spillage on inside of case (Worcester Greenstar 24i System, 2001)

    Thanks mate :)
  16. cr0ft

    Spillage on inside of case (Worcester Greenstar 24i System, 2001)

    Yes.
  17. cr0ft

    Spillage on inside of case (Worcester Greenstar 24i System, 2001)

    On closer inspection the case is missing one of the retaining screws on the bottom left (couldn't see it till I came to put it back on, hidden by boxing) and it's not sealing properly onto the air box. Going to replace the case screw and fit a new seal just to be safe, both cheap parts. Cheers...
  18. cr0ft

    Spillage on inside of case (Worcester Greenstar 24i System, 2001)

    Went to this boiler today to service for the first time and found black spillage marks all over the inside of the outer case (mostly inside the airbox seal area but not all, some are clearly visible outside the seal). Noticed there is a case screw missing on bottom left so am going to replace...
  19. cr0ft

    Commercial FGA

    Where did you buy it from mate?
  20. cr0ft

    Commercial FGA

    Thanks LP, will do that. It's a lot of money to spend and I can try it out on a couple of our boilers first that way.

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