6
Water heating is another key feature of your Metro wood fire; nearly all
Metro models can be fitted with a wetback, which are designed to give
maximum output with minimal effect on the operation of the fire. Only
the Pioneer cast jacket wetback system should be fitted to your Metro;
alternative wetbacks will void the Metro’s emission approvals and may
seriously affect the performance of the appliance and void its warranty.
Wetback connections are as follows, taken facing the Metro/wall; the return
pipe connection is directly above the inlet connection. Heights for all
models are illustrated and detailed opposite on page 7.
• ECO Tiny Ped and ECO Tiny Rad models are 92mm left of the flue centre
• The Tiny Rad Woody model is 184mm left of the flue centre
• Wee Series models are 226mm left of the flue centre
• The Classic Rad model is 184mm left of the flue centre
• All other models are 140mm left of the flue centre
All wetbacks are fitted to the inside rear wall of the firebox, with the
exception of the Tiny Rad Woody, clean air Wee Series models and the
Classic Rad model. Side wetback position for these models is to the outside
left hand firebox wall. Please see the specific installation instructions in the
‘Side Wetback’ box for installation of a wetback into these appliances.
It is recommended the return pipe has a minimum rise of 1 in 12;
performance will reduce as the distance to the storage cylinder increases.
To fit the wetback proceed as follows
1. Remove the rear panel of the Metro by removing the four pozi drive
screws. Remove the two pre-punched knockouts from this panel.
2. Two further knockouts will be visible on the inner rear heatshield,
remove these also. Once these are removed 6mm nuts will be visible
through the knockout holes.
3. Open the Metro’s door and locate two bolts securing the pressed
washers which are visible on the left hand side of the firebox for both
inlet and outlet connection points.
4. A further three bolt heads will also be visible on the inside rear wall of
the firebox; these are threaded into the 6mm thick firebox. Remove all
three.
5. Using the tube of sealant supplied with the wetback, apply a liberal
bead of sealant around both the two connection pipes and also the
outer circumference of the wetback which will face and press against
the inside rear wall of the firebox. This will completely seal the wetback
to the inside rear wall of the fire on installation.
Ensure there is no gap between pipe and rear wall access holes. This
cement must fully cure before appliance use.
6. Fit the wetback into the firebox and carefully pass the connection pipes
through the holes in the rear of the firebox. Securely attach the wetback
using the three bolts previously removed from the rear face of the
firebox, fitting them through the slots provided in the wetback’s jacket.
7. The wetback is now ready for connection to the storage cylinder by a
registered plumber.
Wetback installation
• DO NOT connect to an unvented hot water system
• Install in accordance with AS 3500.4.1 or NZS 4603 and the
appropriate requirements of the relevant building code or codes.
WARNING!
Important Information
• Wetbacks must be connected with water before operating the
fire and available to the wetback while the fire is in operation
• Wetback systems are not suitable for use in locations where the
water supply has lime content. Lime build up inside the coil will
eventually block the coil causing the wetback to fail
• Rainwater collection tanks installed lower than the wetback that
use a water pump to supply the home, can cause problems if
the pump is not operational. In these situations either the type
of wetback or a roof header tank should be considered
CAUTION!
Important Information
Wetback
Suitable for models:
2kW Wetback
• ECO Tiny Rad
• ECO Tiny Ped
Side Wetback
• Tiny Rad Woody
• Wee Rad & Wee Rad Base
• Wee Rad Woody
• Wee Ped
• Classic Rad
3kW Wetback
• Xtreme Rad & Xtreme Rad Base
• Xtreme Rad Woody
• Xtreme Ped
• Mega Rad
• All LTD rural models
4kW Wetback
• All LTD rural models
The R1 and R2 models cannot be fitted with a wetback.