Heatmaster 35 TC - Introduction

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ENGLISHFRANCAISNEDERLANDSESPAÑOLITALIANODEUTSCH
664Y2800
The HeatMaster
®
35 TC combines the
unique ACV Tank-in-Tank concept with
a dual primary circuit resulting in
exceptional performance from a totally
condensing combination boiler.
Tank-in-Tank technology
ACV’s advanced implementation of thermal storage technology is
tried and tested and is remarkably simple, efficient and reliable.
At the heart of the HeatMaster
®
TC is a stainless steel tank
through which the flue tubes pass.
This is surrounded by a mild steel shell containing the primary
water, which extends down to the combustion chamber and even
around the flue tubes. The burner fires onto the primary water
which indirectly heats the stainless steel tank containing the hot
water. As with all Tank-in-Tanks, this is corrugated over its full
height and is suspended in the HeatMaster
®
TC by its hot and
cold water connections.
The area of the heat transfer surface is therefore much greater
than that of standard direct fired water heaters. A much larger
heat transfer surface means that Tank-in-Tank units recover much
faster than any other kind of hot water storage device - and keeps
boiler cycling to a minimum. The high storage temperature within
the inner tank also results in exceptional hot water outputs.
Dual primary circuit technology
The HeatMaster
®
TC primary circuit is split into two sections - a
high temperature upper circuit and a low temperature lower circuit,
divided by a separation plate. The hot water storage tank is located
in the upper circuit which always operates at a temperature of
between 60°C and 90°C. This is ideal for hot water production as
it maintains the stored water at constantly high temperatures,
eliminating bacterial formation such as Legionellae, as well as
resulting in high volume hot water production.
The down-firing flue tubes pass through the upper circuit, through
the separation plate and into the lower circuit. The primary water
here operates at a temperature typically between 30°C and 60°C
for heating (dependent on the heating return temperature), perfect
for condensing when working in heating mode.
Dual coil technology
During hot water mode, the bottom circuit operates at a much
lower temperature, typically 5°C to 20°C depending on the cold
water inlet temperature. The incoming cold water enters the
lower primary circuit via a dual stainless steel coil which preheats
the domestic water prior to it passing into the stainless steel tank
located in the upper circuit. As the coil is wrapped around the
lower flue tubes of the combustion chamber, it is able to absorb
the remaining heat from the flue gases. The result is that during
hot water mode the HeatMaster
®
TC totally condenses whether
on full or part-load.
INTRODUCTION
Heating
The heating return
enters the lower circuit
of the boiler, which allows
the boiler to operate
in condensing mode.
The upper circuit of the
HeatMaster
®
TC is kept
at a consistently high
temperature due to the
internal shunt pump which
ensures that the primary
water circulates around
the heat exchanger flue
tubes.
Heating and hot water
Once up to temperature,
the HeatMaster
®
TC is
capable of producing
heating and hot water
simultaneously.
Hot water
With the upper circuit
maintained at high
temperature, the
HeatMaster
®
TC is always
ready to supply hot water
on demand. The cold
water enters through
the dual coil at the base
of the heat exchanger
and is pre-heated before
entering the hot water
tank. The low temperature
of the bottom circuit
results in continuous
condensation of the flue
gases in hot water mode.
Operating modes
In both heating and hot water modes, the premix
gas burner fully modulates the power to match
the system demand.
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