Vaillant TURBOmax VUW 242 E Service Manual download pdf (Page 19)

Boiler Installation Sequence 5

Instructions for Installation and Servicing turboMAX pro R3 19

Fig. 5.14

Thermostatic radiator valves

The boiler has a built in automatic bypass valve making

it ideal for use in systems with thermostatic radiator val-

ves (no separate system bypass is required).

For optimum fuel economy it is recommended that

where TRV’s are used they are used in conjunction with

a programmable room thermostat or separate timer and

room thermostat to ensure complete boiler shut down

when the heating demand is satisfied. (The radiator in

the room containing the room thermostat should not be

fitted with a TRV).

Frost protection

The boiler has an integral frost thermostat which is desi-

gned for protection of the boiler.To protect remote or

exposed parts of the heating system or property additio-

nal frost protection measures must be taken such as the

installation of an external frost thermostat. This frost

thermostat should be connected across the boiler termi-

nals 3 and 4, in parallel with any external heating con-

trols. External frost protection cannot be used when

plug in timers have been fitted.

Circulating pump

The boiler incorporates a built in circulating pump that

is fully prewired (no additional wiring is necessary). The

pump incorporates an automatic overrun period after

the boiler switches off.

Anti-cycling ‘economiser’ control

The boiler incorporates a built in anti-cycling control to

ensure that energy wasteful short cycling of the boiler

cannot occur. This control prevents the boiler from re-

igniting for a preset period of 5 minutes after central

heating operation (the hot water operation is unaffected

by this control and hot water can be drawn at any time).

Note!

To temporarily override the anti-cycling control

turn the main boiler on/off switch to the off

position „0“ and then back to the on position

„I“ after a few seconds.

987

MAINS

SUPPLY

230 V

50 Hz

20 VDCDO NOT USE IN UK!

3 A FUSE

SWITCH

CONTACTS

ROOM

THERMOSTAT

CLOCK

Automatic pump spin control (APS)

The boiler incorporates a built in control which will spin

the built in circulating pump and operate the diverter

valve (turboMAX only) once in a 24 hour period. This

control helps to prevent seizure when the boiler is not

operated for a period of time. This control is not active

when the power supply to the appliance is turned off.

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