Merlin 600E Operating Instructions Manual

Operating Instructions

Instantaneous Gas Fired Hot Water System

INTRODUCTION

The Merlin 600E is a powerful and extremely effi cient
gas fi red, instantaneous water heater intended for
domestic use.

Operation is automatic. Simply turn on any hot
water tap and the Merlin will light automatically
and continuously supply hot water at the selected
temperature until the tap is turned off . The Merlin never
runs out of hot water. While electricity, water and gas
supplies are connected, hot water is available whenever
the hot water tap is open.

Ignition is electronic; there is no pilot light. When the
hot water tap is off , no gas is used.

Merlin’s microprocessor based control system responds
instantly to changes in fl ow, ensuring smooth, seamless
control over the powerful burner to maintain a steady
temperature.

The Merlin 600E is a fan forced, fully condensing
appliance, suitable for outdoor installation only.

Remote controllers enhance the comfort and
convenience of the system by providing close control
over water temperature from anywhere in the home.
Typically, one controller would be placed in the kitchen/
laundry area and one in each bathroom.

Temperatures selected at a remote controller are
retained in the memory of that controller.

In the event of a system malfunction, an error message
is displayed on the remote controller, which assists with
fault fi nding.

Operating noise level is low.

REMOTE TEMPERATURE CONTROL

Remote controllers are not necessary to operate the
unit, but are strongly recommended as they provide
greater control, comfort and convenience.
For example, setting the temperature on the controller
will maintain shower temperature at approximately the
set temperature, regardless of changes in inlet water
temperature or fl uctuations in pressure due to other
users turning hot or cold taps on and off .

Units operating without remote controllers will deliver
water at the default temperature of 50 deg C and
require mixing with cold water for lower temperatures.

Remote controllers are battery operated and
communicate with the master unit (in the water heater)
via UHF radio link. They are totally portable and require
no installation.

Up to four (4) remote controllers can be used on a
system, and can be added at any time.

Each remote controller has the ability to take control
of an idle system and maintain exclusive control until
surrendered by pressing the transfer button to return
control to the master.

Remote controllers include a battery saving feature
which switches the display off when not in use.

OPERATION WITH REMOTE
CONTROLLERS

To obtain the best performance from your hot water
system, it is important to use the remote controllers
correctly.

Used as intended, the hot water system will supply
hot water at the selected temperature, even when the
water fl ow is varied or when more than one tap is used.

The purpose of the remote control feature is to enable
you to have complete control over your hot water
system.

Adjustments to the operation of your hot water system
can be made with any of the remote controllers.

A diff erent temperature can be stored in the memory of
each remote controller.

Set temperatures: 36,37,38,39,40,41,42,43,44,45,46,
47,48 degrees Celsius.

Default temperature (ie; no control) = 50 degrees
Celsius.

TAKING CONTROL

If you wish to set the hot water temperature from a
remote controller, simply press the “Transfer” button.
If the system is already in use, the water temperature
currently being supplied will be displayed and the
system will not allow you to take control. Transfer is only
permitted when the system is not in use.

If the system is not in use (idle), the temperature last set
on the controller will appear steady on the display and
the “in control” symbol will appear on the left hand side
of the display signifying that this controller now has
exclusive control.

When the hot water tap is turned on, the symbol in
the centre of the display will fl ash, indicating that the
system is in use. The temperature of the hot water being
supplied is displayed and can be adjusted between the
limits of 36 deg C and 48 deg C in steps of 1 degree,
whenever the controller is in control.

To surrender control when fi nished with the hot water,
simply press the “Transfer” button. The “in control”
symbol will disappear and the default temperature of
50 deg C will appear steady on the display.

Note: If the system remains idle for longer than 5
minutes, control will be forfeited and the temperature
will revert back to the default temperature of 50 deg C.