3
Dux Readyhot 11.007 V2 - 28/9/11
PRINCIPLE OF OPERATION (Fig. 2)
The "Readyhot" system heats the water in the pipework water connected between the water heater and the hot
water outlets before any outlets are opened using the 'flow and return' pipework principle. This results in water
savings and reduced waiting time for heated water delivery from the outlet when opened.
Traditional 'flow and return' systems usually keep the water in the pipework heated continuously. The Readyhot
system however, only heats the water before the outlet is opened. This results in significant energy savings
because water is not heated unnecessarily whilst retaining the benefits of traditional flow and return systems.
A schematic of the Readyhot system installed in conjunction with a Dux Endurance water heater and water
controller as shown in Fig.2 below.
The Readyhot system works as follows:
1. Before hot water is required, the user activates the Readyhot system by pressing the 'preheat' button on the
water controller or by pressing the Manual Activation Switch.
2. This activates the Readyhot system and the integral pump is switched on.
3. Water flows from the pump and passes through the water heater. This in turn activates the water heater
burner and water in the flow and return heating loop begins to heat.
4. When the Readyhot control module senses that the water in the full length of the flow and return heating loop
has been heated, the pump and water heater stop operating.
5. The user opens the desired hot water outlet. Preheated water will be delivered from the flow and return
heating loop to the outlet.
LOCATION (Fig. 3)
•
Location and clearance requirements for the Dux water heaters are detailed in the Installation Instructions
supplied with it.
•
The Readyhot module weighs 7.5 kg and the wall or structure on which it is to be mounted must be capable of
supporting the combined weight of the Readyhot unit, water heater and any associated pipework.
•
Both the water heater and Readyhot module must be in an accessible location. Sufficient clearance shall allow
access to, and removal of, all serviceable components. Water heater and Readyhot modules must not be
mounted higher than 3.5 metres from the ground or floor level unless the customer can arrange permanent and
safe access or can arrange another means of access, for example, by means of scissor or boom lifts.
•
The Readyhot module is usually located below the Dux Endurance water heater. However, it can be mounted
anywhere within a 1.0 metre distance from the water heater (length of communication cable is one metre).
•
An 10 Amp, AC240V weatherproof external earthed power point shall be provided adjacent to the Readyhot
module (the power cord is 1.5 metres long).
•
Alternatively, the water heater and Readyhot module can share the same power point provided it is of the dual
outlet type.
•
Double adaptors and extension leads must not be used.
•
The power point must be kept clear of pipework connections, relief valve discharge points and the water heater
flue outlet.
H
O
T
C
O
L
D
G
A
S
Cold Inlet Mains
Readyhot®
Module
Dux Endurance
Continuous
Flow Water Heater
Hot Water
Outlet
Hot Water
Outlet
Fig.2
Heating Loop Flow
Heating Loop Return
One or more
Controllers
Preheat Button
