AM, EM, AQ, BA, ASW - IOM
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Ing.Ji
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í Jiránek
2.5.1 Units MINI with In-built Liquid Receiver
Units equipped with the liquid receiver have installed the “ROTALOCK” valve. This valve is
located on the upper part of the liquid receiver and it is closed as default. Check that it is closed
prior to the vacuuming and then open the ball valve of the liquid line (small valve).
2.6 Circuit Connection
After the vacuuming, connect the outer and inner units by opening the ball valves located in the
inner unit.
2.6.1 Opening the ROTALOCK valve
The ROTALOCK valve must be fully open at units equipped with the liquid receiver. The valve is
open by turning it counter clockwise. When the valve is opening, the stem is being drawn out
the valve body.
2.6.2 Covers and Caps of the Ball Valves and the ROTALOCK Valve
After performing all operations, the caps of ball valves and the ROTALOCK valve must be
screwed back on. When manipulating with the ball valve caps special attention must be paid to
the Teflon sealing so it is not lost. The plastic cap of the ROTALOCK valve is sealed by the
coned surfaces and no sealing is used.
Tighten the valve cap manually
Then tighten by wrench
2.7 Thermal Insulation
Both the liquid and steam piping must be insulated to prevent condensation and frosting on the
piping surface. We recommend using pre-insulated piping designed for heat pumps with UV
protection. If you are using “naked” piping, it must be insulated by insulation based on the PUR
base, e.g.
Armaflex, Kaiflex
etc. Recommended insulation wall thickness is 9mm., the
insulation must be “hermetical”. All joints of the insulation must thus be bonded by special glue
or taped over by adhesive insulation tape. The piping must be insulated down inside the heat
pump cabinet. In the case the insulation is not performed properly, the condensate leaks inside
the heat pump cabinet and corrosion consequently occurs inside the cabinet.
