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54208003-13
3.
Connecting the pipework:
a. Remove the flare nuts from the suction service valve and the expansion device as appropriate.
b. Ensure that both the suction and expansion lines are fully insulated.
c. Place the flare nuts over the incoming pipework and flare the pipe ends.
d. Connect the pipework between the units. Do not leave pipes ends, valves etc open to the
atmosphere. Always use 2 spanners when tightening the flare nuts to avoid twisting the pipes.
Use a small amount of refrigerant oil on the mating surfaces.
e. Sight glasses and filters driers are not necessary, but if required should be fitted between the out
door unit liquid shut off valve and the expansion device on the units.
EVACUATING
1.
Evacuate the interconnecting pipework and indoor unit by connecting a vacuum pump to the
service ports on the outdoor unit valves and evacuate to 1000 microns (1 Torr) or better: hold for
a minimum of 15 minutes.
2.
Open the valves slowly using a 5mm Allen key. If no additional charge is required, read note 4.
3.
If additional charge is required:
a.
Start the unit on maximum indoor fan setting (with heat pump systems in AIR
CONDITIONING MODE) and allow the compressor to run for approximately 10 seconds.
b.
Allow system pressures to stabilize.
c.
Any additional charge should be introduced through the Schrader valve on the indoor
unit or the service port on the suction service valve on the outdoor unit.
Where possible, charge to a sweat line on the evaporator. Typical suction pressures on short lines
at
UK conditions, with maximum evaporator and condenser fan speeds, i.e. during
commissioning, will be 55-60 psig.
Take care not to overcharge the system, otherwise liquid could return to the compressor,
causing damage.
IF NO ADDITIONAL REFRIGERANT CHARGE IS REQUIRED:
Open the valves very slowly using a 5 or 8mm Allen key. On DCU+/DHPU (L) units, remove
link JP6
on
the pcba (identified by a white label), otherwise the fan will always run at maximum speed and the infrared
handset will be inoperative. Replace the caps on the service ports, (torque to 25NM).
IF ADDITIONAL REFRIGERANT IS REQUIRED:
1.
After evacuating the indoor unit and interconnecting pipework, slowly open the valves using 5 or 8mm
Allen key. The high and low pressure should equalise within a minute.
2.
Additional charge should be introduced with the system running in the
air conditioning mode
(including
heat pumps). See indoor unit instruction for additional system charge.
3.
DCU+/DHPUL units are all
fitted with head pressure control. The link wire across the orange terminals
(DCU+) and link between terminal 1 & 6 (DHPUL), allows the fan to operate at full speed.
THIS
SHOULD BE REMOVED AFTER CHARGING
ADDITIONAL REFRIGERANT - pipe runs over 7.5m.
Add refrigerant and oil for each additional meter over 7.5m, based on the following:
Expansion line size.
3/8"
1/2"
5/8"
Additional refrigerant (g/m).
16
30
48
Additional POE oil
25g per 350g of additional
refrigerant to a maximum of 300g
Additional polyolester oil:
L’Unite 181-023,
ICI Emkarate RL32S or
RL32CF, Mobil Arctic
EAL22 or EAL22C.
REFRIGERANT