Vaillant ecoMAX 635, Instructions For Installation And Servicing

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4 Boiler installation sequence
Instructions for installation and servicing ecoMAX
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4.16 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 opti-
mum fuel economy where TRV’s are used they must be
used in conjunction with a boiler control interlock. A pro-
grammable room thermostat or separate timer and
room thermostat will 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).
4.17 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
terminals 3 and 4, in parallel with any external heating
controls.
Note!
External frost protection cannot be used when
plug in timers are utilised.
4.18 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.
4.19 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 after central heating ope-
ration (the hot water operation is unaffected by this con-
trol 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.
4.20 Automatic pump spin control (APS)
The boiler incorporates a built in control which will spin
the built in circulating pump and operate the external
diverter valve once in a 23 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.
Fig. 4.15
Connection details for control systems utilising 3 port motorised valve
via external wiring centre/junction box
Diagram only applies to the specific controls mentioned
L N L N 3 4 5 E N L
CENTRAL
HEATING
ON HOT
WATER
ON HOT
WATER
OFF
3 amp fused
main supply ecoMAX
terminal strip Programmer
for programmer connections see fig. 16.b
L N L N 3 4 5 E 5 3 6 7 8
External wiring centre/junction box*
3 4 5 6 7 8 9 10
N
N
L
L
*Do not use pre-wired printed circuit board type
not used
EARTH BLUE
BROWN
OR
WHITE
GREY ORANGE
3 Port mid position motorised valve
4 E 5 8 9
E C A
N
4
N
4
2
4
4
3
3
3
3
3
2
2
2
2
1
1
L
2
1
L
1
1
1
1
3
C B
E
E
E
E
Vaillant VRT 9090
ACL Drayton Digistat 2, 3, 4
ACL Drayton RTS 1, 2
Danfoss Randall RX-1
Danfoss Randall RMT 230
Danfoss Randall RET 230
Tower SS
Honeywell T6360
Horstmann HRT 2
Siemens-Landys & Staefa RAD 1
Sunvic TLX 2000 series
5 9 6 L N E
Room thermostat
2 1 C
GR
3
3
2
2
BK
1
2
2
1
1
RED
C
1
1
3
ACL Drayton HTS3
Danfoss Randall ATC
Tower STTCSW
Honeywell L641
Horstmann HTC2
Siemens-Landis & Staefa RAM 1
Sunvic SA 2452
8 4 7 E
Cylinder thermostat
3 E
2
E
Vaillant VRT 30
5 4 3
4 3 1
Sunvic TLX 9000
80020014605_00GB_032006 22.02.2006 21:35 Uhr Seite 20