Installing The Gas Connection; Checking The Gas Line For Leak-Tightness; Installing The Hot And Cold Water Connection; Connecting The Heating Flow And Heating Return - Vaillant ecoTEC exclusive 843 Installation And Maintenance Instructions Manual

5 Installation
5.1.1 Information on liquefied petroleum gas
operation
In the as-delivered condition, the product is preset for opera-
tion with the gas group indicated on the data plate.
If you have a product that is preset for operation with natural
gas, you must replace the gas family coding resistor with the
enclosed coding resistor for liquefied petroleum gas during
the installation. During start-up, the product must be con-
verted for operation with liquefied petroleum gas in the in-
stallation assistant. You do not require a conversion set, be-
cause the product has a gas-adaptive heat cell, which is set
independently to the relevant gas type within the gas family.
The gas type can also be changed at a later point using dia-
gnostics code D.087.
If you have selected the "liquid gas" gas type, after the start-
up process is complete, affix the enclosed "Liquid gas" con-
version sticker onto the data plate and affix the enclosed
tank sticker (propane quality) so that it is clearly visible on
the tank or the cylinder cabinet, if possible close to the filler
nozzle.
5.1.2 Purging the liquid gas tank
If the liquid gas tank is not purged properly, this may result in
ignition problems.
▶
Ensure that the liquid gas tank has been purged properly
before installing the product.
▶
If required, contact the filler or the liquid gas supplier.
5.1.3 Using the correct gas type
Using the incorrect gas type may cause fault shutdowns in
the product. Ignition and combustion noise may occur in the
product.
▶
Only use the gas type listed on the data plate.
5.1.4 Required preliminary work
1. Install a stopcock in the gas pipe.
2. Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
3. Check that the volumetric capacity of the expansion
vessel is sufficient for the system volume.
Conditions: The volume of the installed expansion vessel is insufficient
▶
Install an additional expansion vessel, connected as
close to the product as possible, in the heating return.
Conditions: External expansion vessel installed and warm start active
▶
Install a non-return valve in the product outlet (heating
flow) or decommission the internal expansion vessel
in order to prevent the warm start function from being
increasingly activated due to backflow.
4. Install a tundish with condensate trap for the condens-
ate discharge and the exhaust pipe on the expansion
relief valve. Route drain pipework that is as short as
possible, at a downward gradient away from the tun-
dish.
5. Insulate bare pipes exposed to environmental influ-
ences to protect them from frost using suitable insula-
tion material.
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5.2

Installing the gas connection

1. Install the gas line in accordance with the recognised
rules of technology.
2. Connect the product to the gas line in accordance with
the recognised rules of technology.
3. Remove the residues from the gas line by blowing
through the gas line beforehand.
4. Purge the gas line before start-up.
5.3

Checking the gas line for leak-tightness

▶
Check the entire gas line properly for leak-tightness.
5.4

Installing the hot and cold water connection

1. Make the water connections (1) in accordance with the
relevant standards.
2. Ensure correct water pressure and flow requirements
and that any expansion can be accommodated with the
cold supply pipe work.
5.5 Connecting the heating flow and heating
return
▶
Establish the heating connections (1) in accordance with
the relevant standards.
Installation and maintenance instructions ecoTEC exclusive 0020193968_03
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