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13. Installation
Refrigerant pipe installation
Refrigerant pipe work
▶ Use exclusive tools and accessories for R-410A to respond to pressure of the R-410A and prevent foreign
substances from entering into the pipes.
▶ The length of refrigerant pipe should be as short as possible and the height difference between the DVM Hydro
unit / Hydro unit HT and outdoor unit should be minimized.
▶ Piping work must be done within allowable piping length, height difference, and the allowable length after
branching.
▶ The pressure of the R-410A is high. Use only certified refrigerant pipe and follow the installation method.
▶ Use clean refrigerant pipe and there shouldn't be any harmful ion, oxide, dust, iron content or moisture inside
pipe.
▶ Pipe work must be done aside from the product.
▶ After completing the pipe installation, calculate the additional amount of refrigerant according to method of
each indoor units and make sure to use R-410A refrigerant when charging. (Color of the R-410A refrigerant
container is painted in pink.)
Model name of DVM Hydro unit
Amount of additional refrigerant
Do not use Flux when brazing the refrigerant pipes .
f
• The maximum number of the Hydro Unit HT connectable to one system(module) is 3 units .
CAUTION
• In case the capacity combination of the Hydro Unit HT/HE exceeds 50 % among the total indoor unit, please don't put the
additional refrigerant .
• If you need to perform cooling refrigerant charging mode with R-410A outdoor unit, the Hydro unit HT will not operate if
the water temperature is below 33 ºC (91 .4 ºF) . M ake sure to raise the water temperature above 33 ºC (91 .4 ºF) before
conducting cooling refrigerant charging mode .
Alternatively, you can proceed with heating refrigerant charging mode .
• If you need to perform pump down operation, the Hydro unit HT will not operate if the water temperature is below 33 ºC
(91.4 ºF). Make sure to raise the water temperature above 33 ºC (91 .4 ºF) before conducting pump down operation .
• All other indoor units should perform the heating or stop, when R-134a refrigerant collecting operation .
AM036CNBDCH
AM048CNBDCH
AM096CNBDCH
AM048CNBFCB
AM072CNBFCB
0.6 kg (1.3 lb)
AM144CNBDCH
0.7 kg (1.5 lb)
1.2 kg (2.6 lb)
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