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New MicroMax and Our Proven MicroMix Instantaneous
Hot Water Heaters
Graham now is offering two types of hot water on demand instantaneous
heaters - one hot water generated and the other, steam generated. These
two models, known as the Graham MicroMax and MicroMix, respectively, are
an excellent means or providing hot water without a large holding tank
and these can be placed virually anywhere in your plant and even suspended
if floor space is an issue. The following will provide more information
on these models along with application information.
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MicroMax
Boiler Water to Water Heater
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High Efficiency
- The corrugated heat transfer plates and counter flow arrangement
in the MicroMax produce heat transfer rates that are 5 times
higher than with tubular surfaces used in other water heaters.
The result is a smaller package with less boiler water usage.
The boiler water to potable water flow can be as low as 1 to
1 in a MicroMax water heater, compared with 4 to 1 for a conventional
type.
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Scale Prevention:
Plate heat exchangers, as used in the MicroMax, substantially
reduce the risk of scale by constantly redirecting the flow
against the heat transfer plates, scouring them clean of most
scale or biological buildup. For extreme cases, disassembly
of teh plate pack allows for easy cleaning.
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Flexible: The
gasketed plate construction allows for the simple addition or
removal of plates to handle future hot water demands. It also
makes the MicroMax the easiest water heater to service.
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Safe: Optional
double wall plates can elminate the risk of cross contamination
between boiler and domestic water.
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MicroMix II
Steam to Water Heater
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Longer Life: The
Heliflow heat exchanger has helically coiled tubes that are
free to expand and contract with temperature changes. This protects
the heat exchanger from the constant cycling that can exist
with instantaneous heating.
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Compact: The tubes
in the Heliflow are coiled to minimize space requirements while
providing proper steam distribution. This makes the MicroMix
II the smallest instantaneous water heater available.
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Heavy Duty: The
rugged cast construction and brazed tube joints make the Heliflow
more durable than any other heat exchanger (i.e., shell and
tube or plate type) for condensing steam service.
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Easy Maintenance:
When maintenance on the Heliflow is required, the coiled bundle
can be cleaned in place, removed for cleaning or replaced in
minimal space.
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Safe: Optional
double wall tubes can eliminate the risk of cross contamination
between steam and domestic water.
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HOW IT WORKS:
1. The heat source is properly connected
to the heat exchanger of the appropriate package - steam for the MicroMix
II and boiler water for the MicroMax.
2. The water to be heated is piped to
the water heater inlet where it is directed to both the cold port of the
blending valve and the heat exchanger. The heat exchanger heats the water
to the required temperature before sending it to the hot port of the blending
valves for mixing.
3. The blending valve has a proportional
valve plug regulated by the movement of the diaphragm, which is induced
by pressure differentials in the sensing head.
4. A sending line "loads" the
top portion of the diaphragm with supply line cold water pressure while
blended water outlet pressure is being sensed below.
5. Flow demand creates a pressure imbalance
above (+) and below (-) the diaphragm, resulting in movement of the diaphragm
and proportioning plug.
6. The movement aligns ports in the plug
with supply ports in the valve body, introducing the correct proportion
of hot and cold water.
7. This action automatically generates
blended hot water through all rated flow capacities at the chosen preset
temperature (+/- 4 deg. F).
8. The integral fail safe system permits
stem travel in the event of plug restriction or parts failure, opening
an auxiliary cold water port. Cold water flooding yields cooler water
or, in parts failure, no water at all.
9. Temperature is easily adjusted by side-to-side
movement of the control rod on the valve body. Stabilization adjustments
are made during the initial startup by rotation of the control rod.
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