Note On Adding Refrigerant - Senville SENA 18HF MOZ Owner's Manual & Installation Manual

Inset a hex wrench into the valve and turn it
2.
about a 1/4 turn to release some refrigerant
into the system. Once the needle moves,
close the valve. The system is now partially
pressurized.
3. Wait for a few minutes to make sure that
there is no change in pressure. The system is
ready to be fully pressurized.
4.
Unscrew the blue charge hose from the
service port quickly to minimize the release of
refrigerant through the Schrader valve.
Remove the cap from the low pressure
5.
master valve (the larger valve). Using the hex
wrench, open both valves until they hit their
stops. The system is now pressurized.
Screw back all three caps on all valves and
6.
ports and tighten them by hand.
Note on Adding Refrigerant (R410a)
Depending on the length of the installed piping, you may need to add additional refrigerant to
your system. The unit comes pre-charged for Nx25' (7.5m) of piping with R410a type refrigerant.
The additional refrigerant to be charged can be calculated using the following formula:
Model number
SENA/18HF/MOZ
SENA/30HF/MOZ
SENA/36HF/MOZ
SENA/48HF/MOZ
Connective
Air Purging
Pipe Length (ft)
Method
< Nx25' Vacuum Pump
Vacuum Pump
> Nx25'
CAUTION
mix refrigerant types.
DO NOT
Number of ports
N
2
3
4
5
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Liquid Side: Ø 1/4" (ø 6.35mm)
(Pipe length – 25') x 0.16oz/ft
(Pipe length – 7.5m) x 15g/m
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal
wrench until it hits against the stopper. Do not
try to force the valve to open further.
SENA/18HF/MOZ
The dual zone unit doesn't come with master
valves. Each line has to be vacuumed separately
before opening the high and low pressure
valves which will release the refrigerant into the
system.
Total Connective Pipe Length (ft)
50
75
100
125
Additional Refrigerant
None
Liquid Side: Ø 3/8" (ø 9.52mm)
(Pipe length – 25') x 0.32oz/ft
(Pipe length – 7.5m) x 30g/m
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