Pressure Relief Valve For Combi Boilers; Condensate Drain Pipe - Rinnai Q Premier QP85N Installation & Servicing Instructions Manual

6.5.7
Relief valve fi gure 15

6.6 Condensate drain pipe

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Pressure relief valve for Combi boilers

- A CSA approved Temperature and Pressure relief valve is provided with the boiler.
The relief valve is pre-installed on the indirect tank.
- The discharge from the pressure relief valve should be piped to the ground or into
a drain system to prevent exposure or possible burn hazards to humans or other
plant or animal life. Follow local codes. Water discharged from the relief valve
could cause severe burns instantly, scalds, or death.
- A cutout is provided to pipe the relief valve to the ground see Figure 15
- The pressure relief valve must be manually operated once a year to check for
correct operation.
- Do not plug the relief valve and do not install any reducing fi ttings or other
restrictions in the relief line. The relief line should allow for complete drainage of
the valve and the line.
- If a relief valve discharges periodically, this may be due to thermal expansion in a
closed water supply system. Contact the water supplier or local plumbing inspector
on how to correct this situation. Do not plug the relief valve.
- If a combi boiler is installed in a closed water supply system, such as one having
a backfl ow preventer in the cold water supply line, means shall be provided to
control thermal expansion. Contact the water supplier or local plumbing inspector
on how to control thermal expansion.
This boiler produces condensate. Condensate must be drained otherwise the boiler
will not function and can cause product or property damage.
The condensation drain pipe should be connected to a drain in the building by means
of an open connection. By this means the possibility of drain gases effecting the boiler
is prevented. The drain connection should have a minimum diameter of 1.3" / 32mm.
Install the condensation drain pipe according to applicable local code.
If the condensate outlet of the boiler is lower than the public sewage system a
condensate pump must be used.
The condensate produced by the boiler has a pH value between 3 and 4.
Install a neutralization unit if required by local code. It is recommended, but not required
to install a condensate neutralizer.
Rianni offers a condensate neutralizer designed to work with all boiler models. The
condensate neutralizer kit comes with all the necessary fi ttings and mounting material.
PVC pipe must be supplied by the installation contractor.
Rinnai part number: 804000074
Do not drain the condensation water to the external rain gutter because of the
danger of freezing and blockage of the drain.
Before putting the boiler into operation fi ll the condensate trap with 1.27 cups /
300 ml of water. If the boiler will be installed in a high temperature installation
such as baseboard with a supply temperature of 160°F or above, fi ll the
condensate trap with mineral oil instead of water.
Use materials approved by the authority having jurisdiction. In absence of such
authority, PVC and CPVC pipe must comply with ASTM D1785, F441 or D2665.
Cement and primer must comply with ASTM D2564 or F493.
For Canada, use CSA or ULC certifi ed PVC or CPVC pipe, fi ttings and cement.
Periodic cleaning of the condensate disposal system must be carried out.
See the Rinnai Boiler Applications Manual for further information and a piping
diagram for the condensate.
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