Test Run - Hitachi CH-Box Installation Manual

7.

Test Run

Refrigerant piping and connecting wires should be connected to the same refrigerant cycle system.
If they are connected to the dissimilar refrigerant cycle systems, a malfunction may occur.
● Special Attention Regarding Refrigerant Gas Leakage
The refrigerant R410A is non-toxic and inflammable in its original state.
However, in consideration of a state where the refrigerant leaks into the room, measures against
refrigerant leaks must be taken in small rooms where the tolerable level could be exceeded.
Take countermeasures by installing ventilation devices,etc.
< Calculation of Refrigerant Concentration >
(1) Calculate the total quantity of refrigerant R (kg) charged in the system connecting all the indoor units
of rooms to be air-conditioned.
(2) Calculate the room Volume V (m
(3) Calculate the refrigerant concentration C (kg/m
R: Total Quantity of Charged Refrigerant (kg)
V: Room Volume (m
Perform a test run according to the "Installation and Maintenance Manual" of the outdoor unit.
● Do not operate the system until all the check points are cleared.
(A) Check to ensure that the electrical resistance is more than 1 megohm by measuring the
resistance between ground and the terminal block in the electrical box. If not, do not operate
the system until the electrical leakage is found and repaired.
(B) Check to ensure that the stop valves of the outdoor unit are fully opened, and then start the
system.
(C) Apply power to the outdoor unit(s) at least 12 hours prior to operation of the system for
preheating of the compressor oil.
● Pay attention to the following items while the system is running.
(A) Do not touch any of the parts by hand at the discharge gas side, since the compressor
chamber and the pipes at the discharge side are heated higher than 90°C (194°F).
P5417025-rev.1
NOTICE
3
) of each room.
3
)
250
Range below the
density
200
limit of 0.42kg/m
3
(Countermeasures
Not Needed)
150
100
50
0 10 20 30 40 50 60 70
Total Quantity Charged of Refrigerant (kg)
3
) of the room according to the following equation.
= C: Refrigerant Concentration
3
< 0.42 (kg/m ) for R410A
Range above the limit of
0.42kg/m
3
(Countermeasures Needed)
80 90 100 110 120 130 140 150
25