Installation manual

Rinnai Australia - 8 - HOTFLO Electric Storage Water Heater Operating/Installation Manual
Figure 5 - Hot Water Plumbing System Example with Flow and Return Pipe Work and TLD
WATER HEATER LOCATION
All Rinnai mains pressure electric storage hot water systems have an ingress protection rating of IPX4 making them
suitable for internal or external installation.
The water heater should be placed as close as practicable to the most frequently used hot water outlet point or
points to minimize the delay time for hot water delivery. This will usually be the kitchen tap. For installations where
the distance between the water heater and the outlets is considerable, a flow and return system can be used which
minimize the waiting time for hot water delivery.
It is recommended that the water heater is installed at ground or floor level. It must be installed in a vertically upright
position. The water heater must be accessible without the use of a ladder or scaffold. It must not be installed in roof
spaces.
Ensure the pressure and temperature pressure relief (PTR) valve, front covers, thermostats and heating elements
have sufficient clearances and are accessible for service and removal.The information on the rating plates must
also be readable. Leave adequate distance above the water heater (preferably the height of the water heater itself)
so the sacrificial anode can be inspected and replaced via the top cover.
The water heater must be installed in freestanding mode on a level and stable base. For external installations, the
water heater should be mounted on a concrete base at least 50 mm thick or on well seasoned, evenly spread
hardwood slats with a thickness of at least 25 mm. Where property damage can occur as a result of water leakage,
the water heater must be installed with a safe tray (overflow tray) and drain in accordance with AS/NZS 3500.4.
Ensure the water heater does not stand on wet surfaces.
KITCHEN
LAUNDRY
ENSUITE
BATHROOM
NON RETURN
VALVE
PLV 500 kPa
(Not Supplied)
ECV (Not Supplied)
700 kPa or 850 kPa
ISOLATING VALVE
PTR VALVE
(Supplied 850 kPa or
1000 kPa)
WATER
HEATER
COLD
Supply
NON RETURN
VALVE
FLOW+RETURN PUMP
ISOLATING VALVE
UNTEMPERED SUPPLY
TLD
NOTE
Valves with pressure ratings other than specified are unsuitable and must
not be used.
1. This schematic is an example only, variations may also be suitable.
2. Tempered water from a TLD cannot be re-circulated. The TLD must
be positioned in a dead leg, branching off the circulated hot water
flow and return pipe.
WARNING
GENERAL INSTALLATION