Johnson Controls HVWHP072B32S - Page 8

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SM-18006
● In winter, when the ambient temperature is low, equipment and piping can be damaged during the
shutdown periods at night, because the water in the pump or piping will be frozen. To prevent the water
from freezing operate the pumps even during the shutdown periods. In case there is still a danger of
freezing, completely drain the water from the piping. After a long stoppage, be sure to check and clean
the unit in the water system thoroughly before initial startup.
Refrigerant Precautions
To reduce the risk of serious injury or death, the following refrigerant
precautions must be followed.
● As originally manufactured, this unit contains refrigerant installed by Johnson Controls. Johnson
Controls uses only refrigerants that have been approved for use in the unit’s intended home country
or market. Johnson Controls distributors similarly are only authorized to provide refrigerants that
have been approved for use in the countries or markets they serve. The refrigerant used in this unit is
identied on the unit’s faceplate and/or in the associated manuals. Any additions of refrigerant into this
unit must comply with the country’s requirements with regard to refrigerant use and should be obtained
from Johnson Controls distributors. Use of any non-approved refrigerant substitutes will void the
warranty and will increase the potential risk of equipment damage, property damage, personal injury, or
death.
● Take measures to ensure that the refrigerant limitations in ASHRAE Standard 15 (Canada: B52), or
other local codes, are followed. If refrigerant gas has leaked during the installation work, ventilate the
room immediately.
● Check the design pressure for this product is 601 psi (4.15MPa). The pressure of the refrigerant R410A
is 1.4 times higher than that of the refrigerant R22. Therefore, the refrigerant piping for R410A must be
thicker than that for R22. Be sure to use the specied refrigerant piping. If not, the refrigerant piping
may rupture due to an excessive refrigerant pressure. Pay attention to the piping thickness when using
copper refrigerant piping. The thickness of copper refrigerant piping differs depending on its material.
● The refrigerant R410A is adopted. The refrigerant oil tends to be affected by foreign matters such as
moisture, oxide lm, or other non-condensables. Perform the installation work with care to prevent
moisture, dust, or different refrigerant from entering the refrigerant cycle. Foreign matter can be
introduced into the cycle from such parts as expansion valve and the operation may be unavailable.
● To avoid the possibility of different refrigerant or refrigerant oil being introduced into the cycle, the sizes
of the charging connections have been changed from R407C type and R22 type. It is necessary to
prepare the tools listed in Section 3.2 before performing the installation work.
● Use refrigerant pipes and joints which are approved for use with R410A.
● A compressor/unit comprises a pressurized system. Never loosen threaded joints while the system is
under pressure and never open pressurized system parts.
● Before installation is complete, make sure that the refrigerant leak test has been performed. If
refrigerant gases escape into the air, turn OFF the main switch, extinguish any open ames and contact
your service contractor. Refrigerant (Fluorocarbon) for this unit is odorless. If the refrigerant should leak
and come into contact with open ames, toxic gas could be generated. Also, because the uorocarbons
are heavier than air, they settle to the oor, which could cause asphyxiation.
● When installing the unit, and connecting refrigerant piping, keep all piping runs as short as possible,
and make sure to securely connect the refrigerant piping before the compressor starts operating. If
the refrigerant piping is not connected and the compressor activates with the stop valve opened, the
refrigerant cycle will become subjected to extremely high pressure, which can cause an explosion or
re.
● Tighten the are nut in the indoor unit with a torque wrench in the specied manner. Do not apply
excessive force to the are nut when tightening. If you do, the are nut can crack and refrigerant
leakage may occur.
● When maintaining, relocating, and disposing of the unit, dismantle the refrigerant piping after the
compressor stops.
● When pipes are removed out from under the piping cover, after the insulation work is completed, cover
the gap between the piping cover and pipes by a packing (eld-supplied). If the gap is not covered, the
unit may be damaged if snow, rain water or small animals enter the unit.