Enertech Global, LLC
8
WS Rev. E Models
Installation and Operations Manual
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Acceptable Operating Conditions
45°F
40°F
35°F
30°F
25°F
20°F
15°F
10°F
100°F
110°F
115°F
120°F
125°F
130°F
SCROLL COMPRESSOR OPERATING CONDITIONS (WATER TO WATER)
HEATING MODE OPERATION
Source Entering Water Temperature
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70°F
65°F
60°F
55°F
50°F
FAILURE ZONE
Acceptable Operating Conditions
Outside Safe Operating Range
O
utside S
af
e Oper
ating R
ange
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75°F
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80°F
FAILURE ZONE
Load
Lea
ving
W
at
er T
emper
atur
e
Safety
Factor
Safety
Factor
Guidelines For Heating Mode Operation
Enertech recommends the aquastat setting not be set above
110°F for the storage tank temperature. Excessive vibration
and part failure can occur at higher than recommended
temperature settings. The higher operating temperatures
cause substantial efficiency and capacity reductions.
The performance is negatively affected as the unit operates at
the higher water temperatures and it benefits the unit and
the homeowner to operate at or below the recommended
water temperature of 110°F.
The illustration below shows the parameters which are safe
for compressor operation. Based on the leaving load water of
120°F, the loop would have to maintain 35°F to operate
within the acceptable operating conditions for the
compressor. Once your loop temperatures drop below 35°F,
the acceptable leaving load temperature drops below 120°F.
If you are designing loops for 30°F, the recommended leaving
load temperature is 110°F.
With the lower efficiency created by higher water
temperatures, the output capacity of the unit is decreased
along with the efficiency. When operating at the higher
entering water temperature the heat of extraction is
significantly reduced, as well. In order to maintain the needed
capacity, more of the heat is coming from the compressor
working harder to compress the refrigerant.
Because the water-to-water machines have become so
popular for providing heated water for a multitude of uses,
we’ve provided the above chart for reference.
The obvious correlation is that the warmer the Source
Entering Water Temperature, the hotter the Load Leaving
Water Temperature can be, to a point. R410A can only handle
up to about 125°F Load Leaving Water Temperature before
putting the compressor at risk.
Actual usage, and choices of heat distribution devices need to
follow the acceptable operating conditions presented in the
chart. If a question arises, please consult the Technical
Services Department.
Section 3: Installation Considerations