Mitsubishi Electric e Series Service Handbook page 54

[ II Restrictions ]
[7] Ensuring enough water in the water circuit
Required amount of water
1.
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-M1500/1800YCL
EACV-M1500/1800YCL
Calculating the required amount of water in the water circuit
2.
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
3 5
Inlet/Outlet pipe connection size and material
3.
The table below shows the inlet/outlet pipe connection size.
Inlet/Outlet pipe connection size
Piping type
Standard
Inside header piping
type
HWE20010
Minimum amount of water (ℓ)
1650
850
Pipe size
3B (80A) 4B (100A)
5.16 8.87
Inside header piping type
7 5
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
Outlet pipe connection
65A housing type joint
(Field-supplied Victaulic joint)
150A housing type joint
(Field-supplied Victaulic joint)
- 45 -
8B (200A)
32.44
GB