KSN ENERGY BETTER ENERGY HOMES. SEAI Boiler and heating controls guide

Transcription

1 KSN ENERGY BETTER ENERGY HOMES SEAI Boiler and heating controls guide

2 Better Energy scheme Contractors Code of Practice and Standards and Specifications Guidelines Version 6.0 March 2013 This is a guideline document and is to be read in conjunction with the Contractors Code of Practice and Standards and Specification for the Better Energy Homes Scheme. This presentation outlines some of the most critical issues with oil boiler and heating controls installations. It is not a full training manual for installers.

3

4

5 QADP A Heating Standard 1 Controls not working 2 Heating not working correctly 3 Badly fitted radiators 4 Poorly fitted pipe work B Boiler 90% + 1 Less than 90% efficient E Pipework not acceptable 1Under sized 2 Excess solder 3 Badly graded 4 Not adequately supported 5 Damaged 6 Leaking C D Appliance Condition 1 Damaged 2 Rusted Appliance Location 1 Not to regulation or HES standard 2 Difficult to access 3 Client not satisfied

6 F. Condensate Pipe Work 1 Not lagged externally or in larger diameter pipe 2 Not to gulley/drain (internal or external) 3 Not to soak away 4 Incomplete 5 Incorrect materials used If a condensate pipe has to be discharged externally it must be protected from frost. The condensate discharge should: A. Run in a 32mm(minimum) pipe, preferred method B. Or an insulated 22mm pipe Unheated spaces e.g. garages should be treated as external

7 F. Condensate Pipe Work 2 Not to gulley/drain (internal or external) 3 Not to soak away 4 litres of condensate can be produced by a condensing boiler daily The liquid is slightly acidic and must be disposed of correctly. Suitable drain points include: An internal stack/ waste pipe. An external drain or gully. A rainwater hopper that is part of a combined system (i.e. sewer carries both rainwater and foul water). A purpose-made soak away with limestone chippings to dilute the acidic content. Internal drain points are to be preferred as they are less likely to become blocked by leaves, or by frozen condensate

8 F. Condensate Pipe Work 4 Incomplete 5 Incorrect materials used Incomplete note the acidic staining on concrete Incomplete no drain off Incorrect material (metal joint ). It is also incorrectly graded

9 G. Safety Valve / Discharge Safety valve and discharge pipework not installed Safety valve and discharge pipework installed incorrectly External discharge Safe and visible Copper. Pointing towards the ground Continuous fall to avoid freezing Discharging horizontally Discharging above a door If it is impossible to discharge at ground level the valve can be turned back to discharge against the wall

10 G. Safety Valve / Discharge Safety valve and discharge pipework not installed Safety valve and discharge pipework installed incorrectly Internal discharge Safe Visible Tundish required

11 G. Safety Valve / Discharge Safety valve and discharge pipework not installed Safety valve and discharge pipework installed incorrectly Terminating internally although this is not in a house it is not visible and will not alert a homeowner if there is a problem Incomplete

12 H. Oil/ Gas Supply 1. Poor condition 2.Not adequately supported 3.Under sized - 4.Gas not ventilated in casing This is applicable for multi occupancy dwellings Pipe kinked and in poor condition Pipe not supported properly This is a tripping hazard It is liable to be damaged

13 H. Oil/ Gas Supply 5. Remote Fire Valve Not fitted / not fitted to SEAI Standard OFTEC Standards OFS E101 Remote fire valve must be fitted 1m from boiler with sensor over burner Incorrect fire valve Correct fire valve Remote sensor fitted

14 HA. Flue Installation 1. Not to regulation or standard For correct flue installation refer to OFTEC and IS 813/ boiler manuals Too close to vent Too close to window P.O.C s will enter through window

15 HA. Flue Installation 2.Not graded properly Due to condensate from the products of combustion, special care must be taken when installing a flue. Flue fitted to correct fall back towards boiler. Refer to boiler manual Flues graded incorrectly allow condensate to drip out. Note the basin collecting condensate

16 HA. Flue Installation 3 Not sealed properly 4 Not adequately supported 5 Not as per manufacturers instructions Flues must be sealed to prevent harmful gases re-entering the house, which could cause carbon monoxide poisoning If a terminal is less than 2 metres above a balcony, above ground or above a flat roof to which people have access, then a suitable terminal guard must be provided.

17 K. Boiler log book 1 None available 2 Not filled in properly The boiler log book must be filled in and left in the door of the boiler or safely with the home owner for future consultation. The boiler log book is an important document for home owners to keep as it records of the following information: Details of the installing / commissioning contractor Can be necessary to validate the guarantee for the boiler Gives details for future servicing Is a means of ensuring an adequately qualified person has completed the installation of the boiler in compliance with the relevant regulations.

18 J. TRV 1 None installed 2 Installed in room with room stat In addition to establishing 2 zones the contractor must also install either: an additional space heating zone OR install Thermostatic Radiator Valves (TRVs) on at least three radiators but no less than half of all radiators in rooms which do not have room thermostats. A room with a room thermostat fitted should NOT have a TRV fitted to the radiator. The room thermostat temperature sensing becomes inaccurate. The room thermostat is the primary means of temperature control. If a trv has been set low, the radiator will not allow sufficient heat to a room to activate the room stat. This will cause other rooms to over heat Room Stat TRV

19 T. Room Thermostat 1 Poor location 2 Wrong height 3 In direct sunlight 4 Subject to draughts 5 None fitted The room thermostat is the main thermostatic control for the heating system. When the desired room temperature is met, the boiler turns off. The room thermostat should not be located in a room with extreme heat gains such as: A kitchen used for cooking A room with a fire In direct sunlight Above a radiator Room thermostats should be fitted at a height of 1.5m from finished ground level

20 N. Cylinder stat 1 Poor location 2 Not fitted 3 Not working 4 Not earthed 5 Hot water Jacket not fitted Position the cylinder stat between 1/3 and 1/2 way from the base of the cylinder. The recommended temperature setting is between 60 o C and 65 o C as Legionnaires disease is eliminated at this temperature. Pipe stats should not be fitted as an alternative to cylinder stats To be fitted to metal

21 R. 7 Day (2/3 channel) programmer 1 Not fitted correctly 2 Poor location (inaccessible) 3 Wrong height 4 None fitted 5 Incorrect programmer fitted 7 Day programmable control provides the required degree of efficiency control The best location for these programmers is in a visible, easily accessed location. Hidden wardrobe/ press is not a good location Single programmer with switch for zone Only 24 hour control

22 M. Boiler interlock 1. Not installed 2. Not working This is not a control device but a wiring arrangement to prevent the boiler firing when there is no demand for heat. Without an interlock, the boiler is likely to cycle on and off regularly and waste energy by keeping the boiler hot when it is not necessary. This will also reduce the efficiency of the boiler as it will not work in condensing mode as often. In order to assess whether a boiler interlock arrangement is working, turn all room thermostats right down when the boiler is firing - if the boiler continues to fire, then there is no interlock. (The pump may continue to run if the boiler requires a pump to overrun, this is intentional and does not affect the boiler interlock). For regular boiler systems, the interlock is usually arranged so that the room or cylinder thermostat switches the power supply to the boiler (and sometimes the pump) through the motorised valve end switches. For combi boilers interlock is usually achieved by using a room thermostat.

23 L. Auto bypass 1 None installed An automatic by-pass circuit must be installed (in fully pumped systems) in homes where there are 3 or more TRVs in place. When most TRVs are open, the automatic bypass remains closed, allowing the full water flow to circulate around the heating system. As the TRVs start to close, the automatic bypass starts to open, maintaining the appropriate water flow through the boiler. If the boiler has a built in automatic bypass valve that meets the minimum flow rate required, this is satisfactory. An additional bypass is not required

24 L. Auto bypass 2 Manual bypass fitted 3 Incorrectly sited 4 Not visible With a manual bypass there is a constant flow of hot water coming out of the boiler, which is fed directly into the return at all times. This allows the boiler to operate at a higher temperature, which reduces efficiency and restricts the amount of heat transferred to the system. Manual bypass should not be fitted even if an automatic bypass is installed as it nullifies the benefits of the automatic bypass valve. Manual bypass valve

25 O. Space and Water Heating Zones 1 Motorised valve not working 2 Lever valve fitted 3 Radiator heating on hot water only 4 None fitted A separate hot water circuit is to be maintained for energy conservation. All zones need to be automatically controllable meaning lever valves are not suitable Two zones (hot water and central heating with trv s) is the minimum requirement of the scheme. If a 3 zone system has been installed there is no requirement for trv s

26 P. Extra zone 1 Not fitted correctly 2 Neither 3rd zone nor TRV's fitted Q. Pipe work sleeves 1 Not sleeved through walls This relates to gas pipes and oil lines Gas pipes and oil lines are to be sleeved through walls with impermeable material to ensure no gas or oil escapes into an enclosed cavity. (eg) A cavity wall could trap gas and cause an explosion

27 U. Immersion heater timer 1 Not fitted 2 Not working Immersion timers should not be fitted as an alternative to immersion switches Where possible it should be positioned out side the hot press to be viewable for home owners to prevent unnecessary energy waste. If there is no immersion present, no immersion timer is required. Ensure that timer is suitably rated for the loading. We have seen instances where central heating time clocks have been fitted and gone on fire. Load on an immersion is a lot higher than on a heating system Incorrect Wiring Not adequately secured Correct immersion timer

28 V. Electrical Work 1 Incorrectly fused 2.Earthing incomplete 6. No spur switch visible / poorly located 7. 10mm2 Earth not present on heating pipework and Hot Press 9. Flow + Return not bonded 10. Cross Bonding in Hot Press incomplete 11. No 10mm2 earth fitted to gas supply 12.Earth fitted to gas supply is not to ETCI rules IS 813, OFTEC and boiler manufacturers state a fused spur/ isolation switch is required to isolate the entire heating system Boiler manuals will give details of the fuse sizing. Generally it is 5amp for oil and 3amp for gas This provides isolation of the entire heating system (boiler and controls) for maintenance or if there is a fault 13 amp fuse fitted

29 V. Electrical Work Earthing and Bonding must be in accordance with ETCI 101:2008 Chapter 54 (544 Equipotential bonding conductors) and Annex 63B (Guidelines for certification for alterations to existing installations) ETCI rules require all metal pipework to be bonded to each other and to the main earthing terminal by copper wire no smaller than 10mm 2 (typical domestic installation). Older houses often have bonding wires of 6mm 2 or 4mm 2, or even no bonding at all. Bonding < 6mm 2 : Has to be upgraded before any solar heating installation commences. Bonding = 6mm 2 : Installation can be carried out, but the home owner should be issued with a written 'Electrical safety notice.

30 Electrical Safety Notice: Electrical Safety Notice available on SEAI website: ontractor/newsletter/electrical_safety_notice_to_t he_home_owner.pdf

31 V. Electrical Work As per RGI book

32 V. Electrical Work Below is a sketch of a typical bungalow, as you can see all services have been cross bonded to each other and a 10 sq. earth cable has been installed to connect the bonded pipework to the main earth terminal. Heating pipes Domestic hot and cold services Incoming mains

33 V. Electrical Work Earth taken from spur, the ring main is not 10sq. therefore is unsuitable

34 V. Electrical Work

35 W Contractor making good 1 Holes not filled satisfactorily 2 Rubble not removed 3 Damage to furniture/carpets/decoration 4 Incomplete finishing Complete jobs to a neat and tidy standard. X Instruction Given 1 No instruction given 2 inadequate instruction Explain usage of control system to home owner. There is only energy saving if they know how to use the system properly

36 Z. Oil tank location/ installation 1 Location not satisfactory 2 Base not satisfactory 3 oil line not satisfactory 4 Fire barriers required (within 1.8m of combustibles) 5 not in agreed position New oil tank installations are inspected for compliance with OFTEC regulations Oil tank s that have been adjusted e.g. moved are inspected for compliance with OFTEC regulations Tanks are to be 1.8m from non fire rated structures or openings in a fire rated structure 1.8m away from appliance flue terminals, construction openings in buildings and boilers Fire barriers can be installed extending 300mm higher and wider than both ends of the tank. Contractors have a duty of care to notify home owners of any issues regarding the existing oil tank installations that may be non-compliant or dangerous.

37 Oil tanks: Tanks deemed to be Immediate Risk as per OFTEC guidelines should be rectified Immediate risks: Unsafe support, leaking, less than 1.8m from boiler or flue Tanks deemed potential risk should be highlighted to homeowners Poor tank location Loose built blocks as support Not approved tank

38 Cylinder jackets: Where an uninsulated hot water tank is present a lagging jacket should be fitted

39 Entry level heating control's: Minimum requirement: a single zone 24 hour 7-day programmer boiler interlock arrangement

40 Any Questions Contact Details - KSN Energy KSN Energy Contact Centre Gary O Connor goconnor@ksnenergy.ie Mat Mullen mmullen@ksnenergy.ie