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INSTALLATION
Pressure and Temperature Relief (PTR) Valve
A combination PTR valve is supplied with the water heater. It is an important safety device and MUSTBE fitted in
all installations before the water heater is operated.
DONOT use the valve if the sensing probe has been bent or it is damaged in some other way.
The PTR valve is to be screwed to the connection marked "PTR Valve" at the top of the water heater.
The thread MUSTBE sealed with an approved sealing tape. Make sure the sealing tape does NOT hang over
the end of the thread of the valve as this may block the waterway and prevent the valve from operating properly.
To screw the valve into the water heater connection use a wrench on the spanner flats and NOT the valve body.
Leave the valve outlet pointing downwards. A copper drain pipe MUSTBE fitted to the valve outlet in accordance
with the section "Relief Valve Drain Lines" on the bottom of page 16.
The valve body MUST BE insulated in accordance with local regulatory requirements and AS/NZS 3500.4 to
optimise performance and energy efficiency. Insulation MUSTBE applied in a manner that ensures it does NOT
interfere with the operation of the valve. Insulation material MUSTBE weatherproof and UV resistant if exposed.
Expansion Control Valve (ECV)
In areas of scaling water an ECV MUSTBE fitted on the cold water line between the non-return valve and the
connection to the water heater to protect the PTR valve and the water heater, as per the diagrams under "Installation
Configurations". It MUSTBE the last valve on the cold inlet before the water heater.
Local regulatory authorities may require that an ECV be fitted. The ECV is to be supplied and fitted by the installer.
Refer to the section Water Quality for more information on scaling water.
A copper drain pipe MUSTBE fitted to the valve outlet in accordance with the section "Relief Valve Drain Lines"
on the bottom of page 16.
The valve body MUST BE insulated in accordance with local regulatory requirements and AS/NZS 3500.4 to
optimise performance and energy efficiency. Insulation MUSTBE applied in a manner that ensures it does NOT
interfere with the operation of the valve. Insulation material MUSTBEweatherproof and UV resistant if exposed.
Pressure Limiting Valve (PLV)
A PLV is to be fitted if the supply pressure exceeds the limits shown in Table 2 "Ratings & Other Specifications"
on page 11 as per the diagrams under "Installation Configurations". The PLV is to be supplied and fitted by the
installer.
Relief Valve Drain Lines
Copper drain lines of size DN15 MUSTBE fitted to the ECV (if fitted) and the PTR valve. Use disconnection unions
to connect drain lines to the valves.
The configuration of drain lines MUSTBE in accordance with local regulatory requirements and the requirements
of AS/NZS3500.4.
The length should be as short as possible on a continuous downward slope with no restrictions. Length should
NOT exceed 9 metres with no more than three 45° bends. If a drain line discharges into a tundish, the drain line
from the tundish MUSTNOT be less than DN20. The drain line from a tundish MUST meet the same requirements
as drain lines from relief valves.
The drain lines from the PTR valve and ECV (if fitted) from an individual water heater may be interconnected
subject to local regulatory authority requirements and AS/NZS3500.4. The termination point MUST also comply
with local regulatory requirements and AS/NZS3500.4. Drain lines MUSTNOT discharge into a safe tray.
The outlet of drain lines MUSTNOT be obstructed and be positioned so that they are readily discernible but NOT
cause injury, damage or nuisance.
In areas where water pipes are prone to freezing, drain lines MUSTBEinsulated and NOT exceed 300mm in
length. In this case the drain line MUST discharge into a tundish through an air gap of between 75mm and 150 mm.
Rinnai
16
Hotflo Electric Storage Water Heater OIM
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