10
Calculated Example 1
The example below is for a 1/2” diameter temperature relief valve with a discharge pipe (D2) having 4
22mm elbows and a length of 7m from the tundish to the point of discharge.
The maximum resistance allowed for a straight length of 22mm copper discharge pipe (D2) from a 1/2”
diameter temperature relief valve is 9.0m.
Subtract the resistance for 4 x no 22mm elbows at 0.8m each = 3.2m.
Therefore, the maximum permitted length equates to: 5.8m.
5.8m is less than the actual length of 7m, therefore, calculate the next largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from a 1/2” diameter temperature
relief valve equates to: 18m.
Subtract the resistance for 4 No 28mm elbows at 1.0 each = 4m.
Therefore the maximum permitted length equates to: 14m.
As the actual length is 7m, a 28mm diameter copper pipe will be satisfactory.
4.9. Electrical connections
Before turning on the water heater, ensure it has been correctly installed and is full of water.
A1 / L
A2 / L
B1 / N
B2 / N
T2
S
T1
R
1
2
001
s
L1
Models supplied with a power cord with a plug must be plugged into a power outlet. The water heater can be
disconnected from the mains by unplugging it.
IMPORTANT: The outlet must be connected to a separate circuit provided with a safety mechanism. It must
be grounded.
For models equipped with a power cord without a plug, the appliance must be connected to an individual
electrical circuit of fixed installation, equipped with a safety device with a nominal electrical current of 16A
(20A for power> 3700W). The connection must be constant (without a plug). The electrical circuit must be
equipped with a safety device and with a built-in mechanism that ensures the separation of all the poles in
case of type III overvoltage.
• Brown insulation cable to the phase cable of the electrical installation (L).
• Blue insulation cable to the neutral cable of the electrical installation (N).
• Yellow-green insulation conductor cable, to the protective cable of the electrical installation.
5. OPERATION
When you have performed the instructions described in section 4 above, you can start using the water heater
(which has an indicator light)
1
.
The indicator light is turned on when the water heater is connected to heat the water. The indicator light turns
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