Checking For Gas Leaks - Truma Combi eco Installation Instructions Manual

• If local codes allow the use of a flexible
gas appliance connector, always use a new
listed connector. Do not use a connector
which has previously serviced another gas
appliance.
There is a risk of malfunction in the
Combi furnace or damage to the gas valve due
to dirt, chips, etc. in the gas line! Before con-
necting to the appliance, make sure that the gas
line is free of dirt, chips, etc.
1. Make sure that the manual shut-off valve in
the gas line of the appliance is closed.
The gas line to the furnace must be ca-
pable of supplying the maximum required
quantity of gas (≥ 20,400 BTU/h (410 g/h)).
Risk of explosion or poisoning due to
damaged grommet and/or gas line!
• Ensure sufficient length and flexibility of
the gas line for a tension-free connection to
the furnace gas connection.
• Make sure that the gas line has an SAE 45°
flare female connector (Fig. 24).
SAE 45° Flare Male
SAE J512, 5/8"-18
SAE 45° Flare Female
SAE J512, 5/8"-18
Fig. 24
Damage to the flare fitting! The flare
fitting is a dry seal. Never use pipe dope on the
flare fitting.
2. Screw the gas line's union nut (wrench size
3/4 in. (19 mm)) onto the Combi furnace's
gas connection so it is finger-tight.
Gas valve may be damaged during
tightening! Use a second wrench to counterhold
at the square end (wrench size 11/16 in. (17 mm),
Fig. 25).
18
3. Use a torque wrench to tighten the union nut
(nominal torque 15 lb-ft (20 Nm)).
Fig. 25

Checking for gas leaks

Risk of death and personal injury through
fire and/or explosion!
• DO NOT use matches, candles or other
sources of ignition when checking for gas
leaks.
• After the gas supply is connected, check
for gas leaks at all gas connections as
specified in NFPA 1192.
Risk of overheating of the furnace
and toxic exhaust due to incomplete
combustion!
• DO NOT set the inlet pressure higher
than the maximum indicated on the gas
valve type plate (0.5 psi / 13.9 in. wc
(34.5 mbar)).
1. Turn OFF the electrical power supply.
2. Turn on the gas.
3. Check the Combi furnace and all gas con-
nections for gas leaks.
4. Repair gas leaks as needed.
5. Repeat check for gas leaks at all gas
connections.