7 INITIAL ACTIVATION AND MAINTENANCE
58
SCHEDULED MAINTENANCE OPERATIONS
TO BE PERFORMED AT LEAST ONE EVERY TWO YEARS
Check that the condensate discharge is clean
√
*Only in case the analysis of combustion products is non-compliant
In Section 5 p. 20 are reported suggestions related to the hydraulic plant.
7�3 CHANGE OF GAS TYPE
This operation must be carried out exclusively by an authorised Lochinvar Technical Assistance Centre (TAC).
If the appliance is to be used with a type of gas other than that indicated on the the adhesive label located on the unit's electric panel,
switch off the appliance, shut off its power and gas supplies and proceed as follows (see Figure 7.2 p. 59):
You will need: the appliance switched off and disconnected from the gas/electricity supplies
1.
Disconnect the gas pipe from the gas valve.
2.
Undo the 4 bolts E shown in Figure 7.2 p. 59 and remove the gas valve/blower assembly from the burner.
3.
Protect the burner from bolts and nuts falling into it.
4.
Using a CH 4 hex key, undo the 4 bolts G indicated in Figure 7.2 p. 59 and remove the nozzle D from the gas valve.
5.
Replace the nozzle and o-ring C (see Figure 7.2 p. 59) with those of the diameter suited to the new type of gas (see Table
7.3 p. 58). The nozzle code is stamped on the nozzle itself.
6.
Check that the o-ring B is fitted.
7.
Reassemble the gas valve to the blower with the 4 bolts G taking care that the red silicon hose between the venturi tube and
the gas valve (see detail F of Figure 7.2 p. 59) is correctly installed.
8.
Replace the white gasket between the blower and the burner.
9.
Reinstall the blower/gas valve assembly to the burner with the 4 bolts E, taking care not to damage the white gasket.
10. Reconnect the gas pipe to the gas valve.
11. Replace the sticker indicating the type of gas for which the appliance was set up with one that indicates the new type of gas
used.
12. Check the tightness of the installation as follows:
▶
Connect a manometer to the gas intake D (Figure 7.1 p. 56).
▶
Open the gas valve.
▶
Close the gas cock and check that the mains pressure has not dropped.
13. If there is no gas leak, supply gas and electricity to the appliance and restart it.
14. complete the change of gas type by checking that all gas connections are sealed, including those not directly affected by this
operation (using soapy water or another suitable method).
15. Now check and adjust the combustion parameters as indicated in the respective paragraph.
Table 7�3 – Gas nozzles and content of CO2
Gas type
G20
G25
G25�1
G27
G2�350
G30
G31
Nozzle code
180
181
181
187
184
182
183
Nozzle diameter
4,7
5,2
5,2
5,4
5,9
3,4
3,6
Content CO2 with MAX modulation
9,1%
9,2%
10,1%
9,0%
9,0%
10,4%
9,8%
Delta CO2 between Max and Min potential
0,4
0,6
0,8
0,5
0,5
0,5
0,4
Summary of Contents for LCGHP
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