Cautions For Service; Additional Refrigerant Charge; Service Tools; Electronic Weighing Scale - Mitsubishi Electric EHST17D-VM2D Service Manual

Use clean water that meets local quality standards on the primary circuit.
The outdoor unit should be installed in an area with sufficient airflow according to the diagrams in the outdoor unit installation manual.
The cylinder unit should be located inside to minimise heat loss.
Water pipe-runs on the primary circuit between outdoor and indoor unit should be kept to a minimum to reduce heat loss.
Ensure condensate from outdoor unit is piped away from the base to avoid puddles of water.
Remove as much air as possible from the primary and DHW circuits.
Refrigerant leakage may cause suffocation. Provide ventilation in accordance with EN378-1.
Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite.
Never put batteries in your mouth for any reason to avoid accidental ingestion.
Battery ingestion may cause choking and/or poisoning.
Install the unit on a rigid structure to prevent excessive sound or vibration during operation.
Do not transport the cylinder unit with water inside the DHW tank. This could cause damage to the unit.
If power to the cylinder unit is to be turned off (or system switched off) for a long time, the water should be drained.
If unused for a long period, before operation is resumed, DHW tank should be flushed through with potable water.
Preventative measures should be taken against water hammer, such as installing a Water Hammer Arrestor on the primary water circuit, as directed by the man-
ufacturer.
As for the handling of refrigerant, refer to the outdoor unit installation manual.

[1] Cautions for service

(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.

[2] Additional refrigerant charge

When charging directly from refrigerant cylinder
(1) Check that cylinder for R410A or R32 on the market is syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

Electronic weighing scale

[3] Service tools

Use the service tools below as exclusive tools for R410A or R32 refrigerant.
No. Tool name
1 Gauge manifold
2 Charge hose
3
Electronic weighing scale
4 Gas leak detector
5
Adaptor for reverse flow check
6
Refrigerant charge base
7 Refrigerant cylinder
8 Refrigerant recovery equipment
OCH714A
CAUTION
· R410A or R32
· Use the existing fitting specifications . (UNF1/2)
· Use high-tension side pressure of 5.3 MPa·G or over.
· R410A or R32
· Use pressure performance of 5.09 MPa·G or over.
· Use the detector for R134a, R407C, R410A or R32
· Attach on vacuum pump.
· R410A or R32 · Top of cylinder (Pink)
· Cylinder with syphon
5
Unit
Specifications
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