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Mitsubishi Electric E Series Data Book page 63

Air cooled chilling unit
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4. System Design
4-1-6. Ensuring enough water in the water circuit
1. Required amount of water
If the amount of water in the water circuit (circulating water circuit) is insufficient, the unit operation hours may become
shorter or the amount of water temperature change to be controlled may become extremely large.
Also, the defrost operation during the heating mode may not function properly. Refer to the table below for the minimum
amount of water required in the circuit.
If the water pipe is too short to keep enough amount of water, install a cushion tank in the water pipe to ensure enough
amount of water.
Model
EAHV-P1500, 1800YBL
EACV-P1500, 1800YBL
2. Calculating the required amount of water in the water circuit
The required amount of water in the water circuit can be obtained from the following formula.
(Required amount of water in the water circuit) = (Amount of water that can be held in the water pipe) + (Amount of water
that can be held in the heat source unit) + (Amount of water that can be held in the load-side unit)
The amount of water that can be held per meter of the water pipe (ℓ/m)
2 1/2B (65A)
3.77
The amount of water that can be held in the heat source unit (ℓ)
Standard
27
3. Inlet/Outlet pipe connection size and material
The table below shows the inlet/outlet pipe connection size.
Inlet/Outlet pipe connection size
Piping type
Standard
Inside header piping type
MEES19K040
Minimum amount of water (ℓ)
1450
800
Pipe size
3B (80A)
4B (100A)
5.16
8.87
Inlet pipe connection
65A housing type joint
(Field-supplied Victaulic joint)
150A housing type joint
(Field-supplied Victaulic joint)
5B (125A)
6B (150A)
13.23
18.91
Inside header piping type
68
Outlet pipe connection
65A housing type joint
(Field-supplied Victaulic joint)
150A housing type joint
(Field-supplied Victaulic joint)
8B (200A)
32.44
62

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