Rinnai 18
HOTFLO (HFE Series) Electric Storage Water Heater OIM
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 18�
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
Methods”� 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 18�
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�
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 12 as per the diagrams under “Installation Methods”. 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
MUSTBE
insulated 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�
INSTALLATION
