Thermann 26LP50C, Installer Manual

Thermann Installer's Manual

Gas Continuous Flow Condensing Water Heaters

12

This unit generates condensate continuously at a rate of up to 5 litres per hour as a by-
product of the highly efficient gas burner system. 
This condensate must be drained via a pipe to a suitable point of discharge. As the 
condensate is a by-product of gas combustion, it is mildly acidic.
For this reason, copper tube and fittings MUST NOT be used, as they will corrode.
The unit has an in-built condensate neutralizer to make the condensate safe for discharge. 
It is recommended to use DN15 high pressure PVC pipe and fittings for the condensate 
drain line.

CONDENSATE DRAIN

IMPORTANT CONSIDERATIONS FOR THE CONDENSATE DRAIN PIPE

The content of AS/NZS 3500 'Temperature/Pressure Relief and Expansion Control Valve 
Drain Lines' has been used as a guide in preparing these considerations.

DRAINAGE OF CONDENSATE WATER

Condensate drain outlet connection, R1/2" (15mm) BSP male nylon.
Note: the white plastic shipping cap MUST BE removed from the condensate drain outlet 
prior to water heater operation. In the case that white-ish stone pieces (calcium carbonate) 
comes out of the neutralizer when the cap is removed, they should be discarded.
The condensate drain line must have a continuous fall (of at least 2°) from the water 
heater to the discharge point. Lengths and bends must be in accordance with 'Length and 
changes of direction' diagram below.

LENGTHS AND CHANGES OF DIRECTION

Max relief drain length (m)

9

8

7

6

Max numbers of changes of direction (greater than 45°)

3

4

5

6

Drain outlet

2° fall

Fix with pipe clip

PVC piping