Technical Instructions For Recharging; Gas Connection; Heating Side Connection - Vaillant ecoMAX 665 Installation And Maintenance Manual

4.3

Technical instructions for recharging

OS
3
3
Fig. 4.3 Example 3: use of a cylinder, direct heating circuit
1 ecoMAX 665
2 Pump (internal within the appliance)
45 Low Loss header
OS outside sensor
Cylinder connection specification
It is imperative to keep to the minimum volume flow of
the charging circuit of 2,200 l/h. A pump with a constant
speed must be used.
When designing such a system, consideration must be
made for the pressure losses of any non-return valves
and piping to the system.
Pressure [mbar]
1000
900
800
700
600
500
400
300
200
100
0
0 250 500 750 1000
Fig. 4.4 Pressure loss characteristics of connecting a DHW
cylinder.
4.4

Gas connection

a Caution!
Ensure the gas line is unstressed when mount-
ing it so that no leaks are caused.
Installation and maintenance manual ecoMAX 665 / 0020020159_03
1
2
3
230V~
3
45
Pressure loss in
storage charging
circuit of the boiler
Min. volume flow
1250 1500 1750 2000 2250 2500
2200
Volume flow [l/h]
a Caution!
Risk of damaging the gas control block by
exceeding the testing pressure. The gas con-
trol block may only be tested for leaks up to
a maximum pressure of 110 mbar. The operating
pressure may not exceed 60 mbar. If these
pressures are exceeded, the electronic gas
valve may be damaged.
• Screw the appliance's gas supply pipe (1) gas-tight
with the (pre-installed) gas ball cock (2). To do this,
use the R1 compression fitting supplied with the appli-
ance. This is suitable for the connection of a R1 gas
ball cock.
• Inspect the gas connection for leakage.
1
2
Fig. 4.5 Gas connection (only surface installation possible)
4.5

Heating side connection

a Caution!
Ensure the connection lines are unstressed
when mounting them so that no leaks are
caused in the heating system.
The appliance is connected to the heating flow and
return via maintenance cocks.
2750 3000
a Caution!
Ensure that a filling loop or pressurisation
device is installed in the return to maintain
pressure in the system.
h Note!
When installing a direct connection to a DHW
cylinder (indirect type) ensure that the non
return valve in the isolation valve is installed in
the correct orientation.
• Screw in flow (3) and return (4) with the maintenance
cocks.
Installation 4
13