Miele PDR 514 Operating And Installation Instructions page 41

If liquid gas-heated machines are being set up below ground level, the operator must pro-
vide the system with the necessary aeration and induced ventilation equipment in accor-
dance with technical regulations for liquid propane.
If no low pressure occurs when a full fire is burning in all fuel-burning installations, this
means that the room ventilation is working properly, even if the exhaust gases from the in-
stallations are being extracted mechanically. This ensures that the gas is being combusted
correctly and that the exhaust gases are being evacuated completely.
It must not be possible to seal off aeration and ventilation openings.
 Before completing commissioning, maintenance, conversion, and repair work, all
gas-conducting components – from the manual shut-off valve to the burner jet – must
be checked for leaks.
Particular attention must be paid to the measuring stubs on the gas valve. Checks must
be performed when the burner is both switched on and switched off.

Installing thermal shut-off equipment on site is recommended.

If gas-heated appliances are accessible to anyone, it is also necessary to check whether
a gas flow monitor needs to be used.
Gas supply
Required flow rate
Appliance type
PDR 914/514
PDR 918/518
PDR 922/522
PDR 928/528
PDR 944/544
The connected load is based on the following consumption calorific values:
Natural gas: 913 BTU/ft³ (34.02 MJ/m³) (Hi))
Liquid propane: 19,625 BTU/lb (45.65 MJ/kg (Hi))
Rated heat load (Hi)
15 kW
18 kW
21.5 kW
30 kW
36 kW
Natural gas
0.936 CFM
(1.59 m³/h)
1.118 CFM
(1.90 m³/h)
1.342 CFM
(2.28 m³/h)
1.866 CFM
(3.17 m³/h)
2.242 CFM
(3.81 m³/h)
Installation
Liquid propane
2.6 lb/h
(1.18 kg/h)
3.13 lb/h
(1.42 kg/h)
3.75 lb/h
(1.70 kg/h)
5.22 lb/h
(2.37 kg/h)
6.26 lb/h
(2.84 kg/h)
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