Johnson Controls HVWHP072B32S - Page 9

SM-18006
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● Do not apply excessive force to the stop valve at the end of opening. Otherwise, the stop valve ies
out due to refrigerant pressure. At the test run, fully open the gas and liquid valves, otherwise, these
devices will be damaged. (It is closed before shipment.)
● If the arrangement for water source units is incorrect, it may cause owback of the refrigerant and result
in failure of the water source unit.
● The refrigerant system may be damaged if the slope of the piping connection kit exceeds +15
o
.
Electrical Precautions
Take the following precautions to reduce the risk of electric shock, re or
explosion resulting in serious injury or death.
● Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and
these instructions when wiring. Improper connections and inadequate grounding can cause property
damage, serious injury, or death.
● Perform all electrical work in strict accordance with this manual and all the relevant regulatory
standards.
● Before servicing, open and tag all disconnect switches. Never assume electrical power is disconnected.
Check with meter and equipment.
● Only use electrical protection equipment and tools suited for this installation.
● Use specied cables between units.
● The new air conditioner may not function normally in the following instances:
◦ If electrical power for the new air conditioner is supplied from the same transformer as the external
equipment* referred to below.
◦ If the power supply cables for this external equipment* and the new air conditioner unit are located in
close proximity to each other.
External Equipment*: (Example): A lift, container crane, rectier for electric railway, inverter
power device, arc furnace, electric furnace, large-sized induction motor and large-sized
switch.
Regarding the cases mentioned above, surge voltage may be inducted into the power supply cables
for the packaged air conditioner due to a rapid change in power consumption of the device and an
activation of a switch.
Check eld regulations and standards before performing electrical work in order to protect the power
supply for the new air conditioner unit.
● Communication cable shall be a minimum of AWG18 (0.82mm
2
), 2-Conductor, Stranded Copper.
Shielded cable must be considered for applications and routing in areas of high EMI and other sources
of potentially excessive electrical noise to reduce the potential for communication errors. When
shielded cable is applied, secure properly and terminate cable shield as required per Johnson Controls
guidelines. Plenum and riser ratings for communication cables must be considered per application and
local code requirements.
● Use an exclusive power supply for the air conditioner at the unit’s rated voltage.
● Be sure to install circuit breakers (ground fault interrupter, isolating switch, molded case circuit breaker
and so on), with the specied capacity. Ensure that the wiring terminals are tightened securely to
recommended torque specications.
● Clamp electrical wires securely with a cable clamp after all wiring is connected to the terminal block. In
addition, run wires securely through the wiring access channel.
● When installing the power lines, do not apply tension to the cables. Secure the suspended cables at
regular intervals.
● Make sure that the terminals do not come into contact with the surface of the electrical box. If the
terminals are too close to the surface, it may lead to failures at the terminal connection.
● Turn OFF and disconnect the unit from the power supply when handling the service connector.
Do not open the service access cover or service panel to the indoor or water source units without
turning OFF the main power supply.