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Operation
Gas Burner first start
The PCH burner are supplied with factory settings
according to model number gas selection. They are
tested for the gas specified on the burner nameplate.
However it is required to
- Check the gas category
- Check the gas intake pressure on the gas valve
- Perform the combustion analysis to verify
that the level of flue gases corresponds to
the data contained in general data table or in
manufacturer IOM manual.
When turned on for the first time, the pilot burner may
not ignite due to air kept in gas hose. There is the need
to reset the equipment and repeat the operation until
gas hose is purged and it ignites.
Consult electrical drawing and supplier IOM shipped
with the unit.
Figure 43 - Example of PCH burner
Table 7 - Marking Category of gas section in different countries
CATEGORY
G20
II 2Esi3P
mbar
20
DK, FI, GR, SE, NO, IT, CZ, EE, LT, SI, AL, MK,
II 2H3B/P
mbar
20
II 2H3B/P
mbar
20
II 2HS3B/P
mbar
25
II 2L3B/P
mbar
-
II 2H3P
mbar
20
I 2E( S )
mbar
20
I 2E( R )
mbar
20
II 2ELwLs3B/P
mbar
20
II 2E3P
mbar
20
II 2ELL3B/P
mbar
20
I 3P
mbar
-
I 2H
mbar
20
RT-SVX056D-GB
G25
G31
FR
25
37
BG, RO, HR, TR
-
30
AT, CH
-
50
HU
-
-
NL
25
30/37/50
ES, GB, IE, PT, SK
-
37
BE < 70kW
25
-
BE > 70kW
25
-
PL
-
37
LU
-
30/37/50
DE
20
50
BE
-
37
LV
-
-
Premix burner working cycle
1. Heat request signal coming from CH536
2. Burner fan starts to pre-wash combustion chamber
3. EV1 and EVP gas valves open to allow gas to feed
pilot burner
4. Start up electrode gives ignition sparks on pilot
burner
5. EV2 main gas valve opens to gas feed main burner
6. Combustion starts thanks to pilot flame ignition
7. Pilot and main burners work together for a shor time,
then the electronic boards close EVP and stops the
pilot
Figure 44 - Premix burner of working cycle
Interface panel
PCH
Red 3 digit LCD display
Module status (rdy, On, Off, Fxx...)
3 levels menu:
- I/O (Input/Output)
- PAR (parameters)
- Flt (Faults)
ERC first start and control
- Check ERC compressor rotation
- Power indoor fans and set to design supply air flow
- Set return roofcurb fans (if present) to design air flow
- Power exhaust fans and check correct rotation.
- In both heating and cooling mode, ERC compressor
has priority to start.
- ERC compressor is not authorised to start when indoor
air temperature is outside its operating map or fresh
air rate is under 20%.
- Outside operating conditions, ERC doesn't start and
unit control is as usual
- When ERC becomes available its compressor gets
loading priority.
43
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