Hot Pipe Installation Work Sheet - Hitachi RAM-60QH4 Manuel De Service

Outdoor Unit of Room Air Conditioner
Hot pipe (RAM-60QH4 950) Installation work sheet
APPLICATION
Preventing the freezing of drain water from the outdoor unit when heating during winter
No responsibility is accepted for any form of use other than the designated application.
Heating and cooling capability may be slightly affected by use of the hot pipe. Time taken to heat and cool may
CAUTION
be slightly longer than when the hot pipe is used.
Models applicable for use with the hot pipe
RAM-60QH4
Please contact your nearest service center for details.
Hot pipe installation method
(Start from 1. if the outdoor unit has already been installed. Start from 4. if the outdoor unit has not yet to be installed.)
1. Recovering the refrigerant.
2. Turn off the circuit breaker then remove the connecting cord.
Be sure to check that the circuit breaker is off before removing
WARNING
the connecting cord.
3. Remove the attached pipes from the service valve.
(Pull the outdoor unit forward and create space if there is insufficient space at the rear to insert
the pipe from the heat exchanger side.)
4. Remove external parts 1 to 9 and the main unit parts. (See figures 2 and 3.)
(Refer to the "Disassembly and Reassembly" section in the Service Guide to remove the parts.
Refer to figure 4 for the positions of the screws securing the motor support and the partition
board.)
1 Top cover
3 Side cover (right)
5 Grill
7 Propeller fan
9 Partition board
Screws
(for securing partition board)
Motor support Screws
(for securing motor support)
Figure 4
5. Remove the bushing (two each on left and right) that is attached to the base.
6. Remove the securing screws of the heat exchanger (one screw each on left and right)
and the valve plate (one screw) to the base (refer to figure 5).
Service valve for Small diameter side of outdoor unit
connecting flare nut
4 Side cover (left)
1 Top cover
2 Front cover
2 Front cover
4 Side cover (left)
6 Electrical parts
8 Motor support
8 Motor support
Partition board
7 Propeller fan
Valve plate
(for securing valve plate)
7. Lift up the heat exchanger as shown in figure 6, and create a gap
of approximately 10 mm between the base and the lower surface
of the heat exchanger. Then insert the hot pipe into the top of the
base from the gap, and secure as shown in figure 7.
CAUTION
8. Return the heat exchanger and valve plate to the original
position, and refasten the screws (3 pcs.) you had removed
earlier to the base. Then, bend the hot pipe (Flare nut side) as
shown in figure 7.
Small diameter pipe
union joint
Hot pipe (main unit)
9. Pass the hot pipe through the lowest opening
in the rear surface corner of the side cover
Figure 1
(right), and move the side cover (right) along
the hot pipe until it is in the installation position
3 Side cover (right)
5 Grill
(figure 8). Then bend the hot pipe again so that
the flare nut and hot pipe is returned to its
original position (figure 8).
If you don't pass the hot pipe through the
lowest opening in the side cover (right), the
side cover (right) will come into contact with the
6 Electrical parts
Figure 2
hot pipe and you will be unable to return the
side cover to its original position.
Heat exchanger
10. Reassemble the parts removed in 4.
11. Connect the pipes. As shown in figure 9, connect the hot
pipe between the narrow side service valve and narrow
diameter pipe of indoor unit 2. Adjust the length of the
narrow diameter pipe by cutting off the excess.
9 Partition board
12. Connect the connecting cord to the terminal board.
Figure 3
WARNING
Heat exchanger
13. Evacuate the air parts.
14. Open the service valve, and check to see that there is no gas leak.
15. Remove the upper cover and the valve cover.
16. Perform a test run to check if the unit operates correctly.
Screw
Screw
(for securing heat exchanger)
Figure 5
There is a danger of injury if you handle the
heat exchanger with bare hands. Be sure to
wear appropriate gloves when lifting the
heat exchanger.
Place the hot pipe on the heat exchanger.
Hot pipe
Heat exchanger
(Set so that it does not ride up on the raised portion on the base.)
Figure 7
Hot pipe
Lowest opening in the rear surface corner
(pass the hot pipe through here)
Narrow diameter side
service valve
Hot pipe connection position
There is a danger of damage to the terminal
board if the connecting cord is insufficiently
or incorrectly inserted into it.
※Hot pipe is connected to the indoor unit 2
side. However, defrosting can be performed
when either indoor unit 1 or 2 is being
operated, with no problem.
Heat exchanger
Hot pipe
Lift this way.
Insert from the side.
Figure 6
Bend the hot pipe so that it is
kept away from the service valve.
Flare nut
Bend the hot pipe so that it
Side cover (right)
returns to its original position.
Flare nut
Figure 8
Narrow diameter
pipe
Hot pipe
Figure 9
– 165 –