41
Refrigerant Piping Connections
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REFRIGERANT PIPING CONNECTIONS
Finishing the Job
Once the Evacuation procedure has been performed, follow the steps below to turn off all valves at the outdoor unit and safely disengage the
manifold valve, along with the vacuum pump. Refer back to the illustrations and tables on the previous pages as you go through the steps below.
Procedure
1. Using a wrench, turn the valve of the liquid stem counter-clock-
wise to fully open the valve (Figure 55 on previous page).
2. Turn valve of gas stem counter-clockwise to fully open valve.
3. Loosen the charge hose connected to the gas side service port
slightly to release the pressure, and then remove the hose.
4. Replace the flare nut and its cap on the gas service port and
fasten the flare nut securely using an adjustable wrench.
• This process is very important to prevent leakage from the system.
5. Replace the valve caps at both gas and liquid side service valves
and then fasten them tightly.
• Once done, this will complete the air purging process with a
vacuum pump.
Test Run
After leakage testing, and evacuation procedure the system should
be ready to start up for a test run. Follow the guidelines below for
proper procedure.
• Check that all tubing, piping and wiring are properly connected.
• Make sure that the gas and liquid service valves are fully open.
• Start up the system and do a test run.
• As system is up and running verify all is in working order and make
notes as needed to work around any issues that might crop up.
Evacuation
After successful leak testing has been performed, follow Evacuation procedure. Follow the same steps for charge hose hookup to the system.
See Figure 55 on previous page for proper hookup.
Evacuation of Lines
Finishing Up
Procedure
1. Confirm that the “Lo” knob of the manifold valve is open. Refer
2. Confirm that the “Hi” knob of the manifold valve is left closed.
3. Run the Vacuum pump.
• Operate pump until system is evacuated down to 300 microns.
• Run pump an additional 15 minutes after reaching micron level.
The duration of the operation of the vacuum pump will vary accord-
ing to pipe length and the capacity of the pump. Refer to Table 16 for
accurate time duration.
4. Turn off the pump and leave the connections secured to the two
service valves.
5. Wait 5 minutes.
6. If the system fails to hold 500 microns or less, check all connec-
tions for tight fit and repeat the evacuation procedure.
7. Once, desired vacuum is reached, close the “Lo” knob of the
manifold valve and stop the vacuum pump.
8. Proceed to
Finishing the Job
section, below.
Example
: A 50ft line set is used when installing a 12k unit--
9 additional feet x 0.22 oz per ft = Add 1.98 oz of R410A
If you are uncertain of the unit charge, reclaim, evacuate and weigh
in the correct charge using the unit nameplate (capacity) charge
adjusting for line sets longer or shorter than 41 ft. This will prevent any
interruptions to the functioning of the unit and possible damage.
Charging
Each outdoor unit is factory charged (nameplate charge) for the
evaporator as well as a standard 41 ft line. Any time a line set
is used that is longer then the standard 41 ft line set length, the
refrigerant charge has to be adjusted.
You must adjust the charge based on how many feet of piping
are added based on 0.22 oz. of R410A per foot for 9k/12k units
and 0.38 oz for 18k/24k units. The factory charge accommodates
pipe lengths up to the standard length without requiring refrigerant
removal.
Capacity
(Btu/h)
HYV1
Pipe Size
Standard
Length (ft)
Max.
Elevation (ft)
Max.
Length (ft)
Min.
Length (ft)
Additional
Refrigerant If
Longer Than 41 ft.
(oz/ft)
Vapor
Liquid
9k, 12k
3/8
1/4
41
32.8
65.6
6.6
0.22
18k, 24k
5/8
3/8
24.6
65.6
98.4
9.8
0.38
Table 17: Charging - Additional Refrigerant