Installation and operating instruction
Gas condensing unit WTC-GB 15-B Compact and WTC-GB 25-B Compact
5 Installation
83309302 1/2018-05 La
40-196
5.3 Gas supply
Only an approved gas installer may carry out the gas side connection. Observe
local regulations.
The gas characteristics must match the data given on the name plate of the appli-
ance.
The appliance is factory preset to Natural Gas.
Conversion from Natural Gas to Liquid Petroleum Gas [ch. 7.1.3].
Gas connection pressure
During operation, the gas connection pressure must be within the following range:
Natural Gas E/H
17.0 …
20
… 25.0 mbar
Natural Gas LL
20.0 …
25
… 30.0 mbar
LPG B/P (p
n
37)
25.0 …
37
… 45.0 mbar
LPG B/P (p
n
50)
42.5 …
50
… 57.5 mbar
Operation outside the ranges according to EN 437 is not permitted.
Installing the gas supply
DANGER
Risk of explosion due to leaking gas
Gas leaks can lead to a build-up of explosive gas/air mixture. With an ignition
source present this can result in an explosion.
Install gas supply with care.
Observe all safety instructions.
Close fuel shut off devices prior to commencing work and protect from acci-
dental re-opening.
Install gas supply pipes tension free.
Connect gas supply to gas isolating valve
1
.
1
Carry out soundness test of gas supply line and vent
Only the gas supply company or a contract installation company may carry out a
soundness test and vent the gas line.
Gas safety valve
The gas safety valve opens only when the output is configured, therefore the flue
gas measurement must be skipped during initial commissioning and carried out
later.