Operating instructions

INSTALLATION – WATER HEATER

CIRCULATED HOT WATER FLOW AND RETURN SYSTEM

An 884 series continuous flow water heater can be installed as part of a circulated hot water flow and return

system in a building.

Notes:

• the preset outlet temperature setting of the water heater must be set to at least 60°C.

Water should not be circulated from a water heater with a temperature setting of less than 60°C. In New

Zealand an approved UV sterilisation or chlorine disinfection system may be used if the temperature

setting of the water heater is less than 60°C.

• temperature controllers should not be installed with a water heater as part of a circulated hot water flow

and return system.

The exception is with an Ez-Link System dual installation, where:

 AU – only a Kitchen controller can be installed, which MUST NOT be below 60°C to meet the

requirements of the Plumbing Standard.

 NZ – can have a Kitchen controller and / or Bathroom controller(s) installed and must also have an

approved UV sterilisation or chlorine disinfection system installed. This is required as the maximum

temperature controller settings are less than 60°C, and the requirements of the Plumbing Standard

must be met.

Warning: The controller must be left on during periods the circulator may operate.

The circulator must be:

• sized and set to provide a minimum flow rate of 3.0 L/min through the recirculated hot water flow and

return system, and

• either thermostatically and / or timer controlled.

The circulator must not

be set to operate continuously, i.e. 24 hours per day.

Warning: An 886 series continuous flow water heater must not be installed as part of a circulated hot

water flow and return system in a building.

Temperature Limiting Device

A temperature limiting device cannot be installed in circulated hot water flow and return pipe work. The

tempered water from a temperature limiting device cannot be circulated. Where a circulated hot water flow

and return system is required in a building, a temperature limiting device can only be installed on a dead leg,

branching off the circulated hot water flow and return pipe.

If circulated tempered water were to be returned back to the water heater, depending on the location of the

return line connection on the water supply line to the water heater, then either:

• water will be supplied to the cold water inlet of the temperature limiting device at a temperature

exceeding the maximum recommended water supply temperature, or

• when the hot taps are closed no water will be supplied to the cold water inlet of the temperature limiting

device whilst hot water will continue to be supplied to the hot water inlet of the temperature limiting

device.

These conditions may result in either water at a temperature exceeding the requirements of AS/NZS 3500.4

being delivered to the hot water outlets in the ablution areas, or the device closing completely and not

delivering water at all, or the device failing. Under either condition, the operation and performance of the

device cannot be guaranteed.