Functional Checks Commissioning (Part Ii) 7; Functional Checks; Heating; Domestic Hot Water (If Optional Vr65, Unistor Cylinder And Vaillant Control Are Installed) - Vaillant ecoTEC plus Instructions For Installation And Servicing

7 Functional checks commissioning
(part II)
7.1

Functional checks

After installing and checking the gas supply pressure,
perform a function check before commissioning the
appliance and handing over to the user.
• Commission the appliance according to the relevant
operating manual.
• Check the gas supply pipe, flue system, heating system
and the hot water pipes for leaks.
• Check that the flue system has been installed properly
according to the flue system installation manual.
• Check for ignition and an even flame on the burner.
• Perform a function check on the heating system (see
Section 7.1.).
• Perform a function check on the domestic hot water
system (If applicable optional accessories are fitted)
(see Section 7.1.1
Fig. 7.1 Functional checks (appliance on)
7.2

Heating

Fig. 7.2 Display indicator during heating mode
• Switch on the appliance.
• Make sure that there is a heating demand.
• Press "i" to activate the status indicator.
Instructions for installation and servicing ecoTEC plus / 0020020828_05

Functional checks commissioning (Part II) 7

As soon as a heat demand is received, the appliance
runs through the status indicators "S. 1" to "S. 3", until
the appliance is running correctly in normal mode and
the display shows "S. 4".
7.3 Domestic hot water (If optional VR65, uniSTOR
cylinder and Vaillant control are installed)
• Switch on the appliance.
• Fully open the hot water tap.
• Press "i" to activate the status indicator. If the water
heating is working correctly, the display shows the fol-
lowing: "S.24".
Fig. 7.3 Display indicator during water heating
7.4

Pump exercise programme

After a power cut or every 23 hour in frost protection
mode the pump will run for one minute to prevent it
from sticking. This will also occur during normal operat-
ing if there is no demand for more than 24 hours.
7.5

Final flush of the heating system (hot)

• Operate the appliance until the heating system is up
to temperature.
• Check the heating system for leaks.
• Connect a hose to the drain valve located at the lowest
position of the heating system.
• Shut off the appliance, open the drain valve and all
bleed valves on the radiators and allow the water to
flow out of the heating system and the boiler quickly
and fully.
• Close the drain valve.
• Fill the heating system again with water.
• If fitted to a sealed system. Release water from the
system until the system design pressure is attained.
(The actual reading on the digital pressure gauge
should ideally be 0.5 bar plus an additional pressure
corresponding to the highest point of the system
above the base of the boiler 10 m head equals an
additional 1 bar reading on the pressure gauge. The
minimum pressure should not be less than 1 bar in any
installation.) If the system is to be treated with an in-
hibitor it should be applied at this stage in accordance
with the manufacturer's instructions. Further informa-
tion can be obtained from:
Sentinel, Betz Dearborn Ltd., Tel: 0151 420 9595, or
Fernox, Alpha–Fry technologies. Tel: 0870 8700362.
• Refit the boiler casing (see section 5.10)
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