Glow-worm Ultracom hxi - Manual (Page 27)

0020107233_00 - 06/11 - Glow-worm
MAINTENANCE
- 27 -
Servicing
General Inspection
Prior to, during servicing and after any maintenance or
changed parts, the following must be checked.
● The integrity of the flue system and flue seals.
● The integrity of the appliance combustion circuit and
relevant seals.
● Electrical, gas and water connections.
● System pressure.
● the combustion performance, refer to the following
procedure.
● The operational gas inlet pressure and gas rates, refer to
the commissioning section paragraph 10.5.
Correct any fault before continuing.
CoMPeTenCY To CaRRY oUT THe CHeCK
of CoMbUSTIon PeRfoRManCe
noTe: BS 6798: 2009 Specification for installation and
maintenance of gas-fired boilers of rated input not exceeding
70kW net advises that:
● The person carrying out a combustion measurement must
be assessed as competent in the use of a flue gas analyser
and the interpretation of the results.
● The flue gas analyser used should be one meeting the
requirements of BS7927 or BS-EN50379-3 and be calibrated
in accordance with the analyser manufacturers’ requirements.
● Competence can be demonstrated by satisfactory
completion of the CPA1 ACS assessment, which covers
the use of electronic portable combustion gas analysers in
accordance with BS 7967, parts 1 to 4.
● Ensure that the gas analyser is set to the correct fuel
setting.
● Select the “
°C
bar
”, central heating function by pressing the
“Mode” button repeatedly, refer to commissioning section. The
boiler should fire automatically.
noTe: Safe combustion can only be verified by measuring
CO/CO2 ratio. This must not exceed the value shown in the
table below.
CoMbUSTIon CHeCK anD SeTTInG THe aIR/
GaS RaTIo ValVe
● Remove the front casing panel, see diagram 11.2 and hinge
down the control box. Taking care not to touch any internal
components, proceed as follows:
● Connect the CO2 combustion analyser to the relevant test
point, see diagram 11.1.
Diagram 11.1
15442
G31 bURneR % Co2
MoDel CHeCK
(case on)
SeTTInG
(case off)
Co/Co2
ratio
12hxi 9.2 to 10.2 10.1 +0.0 - 0.8 0.004
15hxi 9.8 to 10.8 10.1 +0.5 - 0.5 0.004
18hxi 9.2 to 10.2 10.1
+0.0 - 1.0
0.004
24hxi 9.2 to 10.2 10.1 +0.3 - 0.8 0.004
30hxi 10.0 to 11.0 10.5 +0.3 - 0.8 0.004
38hxi 9.2 to 10.2 9.8
+0.2 - 0.8
0.004
G20 bURneR % Co2
MoDel CHeCK
(case on)
SeTTInG
(case off)
Co/Co2
ratio
12hxi 8.5 to 9.6 9.1 +0.2 - 0.5 0.004
15hxi 8.5 to 9.6 9.1 +0.2 - 0.5 0.004
18hxi 8.5 to 9.6 9.1
+0.2 - 0.5
0.004
24hxi 8.5 to 9.6 9.1 +0.2 - 0.5 0.004
30hxi 8.5 to 9.6 9.1 +0.2 - 0.5 0.004
38hxi 8.5 to 9.6 8.8 +0.2 - 0.5 0.004
IMPoRTanT noTeS:
1. To ensure the continued efficient and safe operation of the boiler it is recommended that it is checked and serviced at
regular intervals. The frequency of servicing will depend upon the particular installation and usage, but in general once a
year should be enough.
2. It is the Law that any servicing is carried out by a competent person approved at the time by the Health and Safety
Executive .
3. Before commencing with a service or replacement of parts the boiler should be isolated from the electrical supply and the
gas supply should be turned off at the gas isolation valve.
4. When replacing a part on this appliance, use only spare parts that you can be assured conform to the safety and
performance specification that we require. Do not use reconditioned or copy parts that have not been clearly authorised
by Glow-worm.
5. If any electrical connections have been disconnected and after their connection, checks to the earth continuity, polarity,
short circuit and resistance to earth must be repeated using a suitable multimeter, as described in section 12.
6. After servicing, complete the relevant Service Interval Record section of the Benchmark Checklist located in the inside
back pages of this document.