Outdoor Units; Outline Of Heating Operation; Summary; Operation Of Major Functional Components In Heating Mode - Mitsubishi Heavy Industries SCM50ZS-S1 Technical Manual

7.3 Outdoor units

7.3.1 Outline of heating operation

(1) Summary

(a) Capacity control
(i) Indoor unit SRK ** ZSX models only
Model
Capacity
(ii) Indoor unit SKM**ZSP-S models only
Model
Capacity
(iii) Indoor unit except SRK ** ZSX and SKM**ZSP-S models
Model
Capacity
Capacity control is within the range shown above. If demand capacity of the indoor units exceeds the maximum
capacity of the outdoor unit, the demand capacity will be proportionally distributed.
(b) Outdoor compressor speed control
Indoor compressor total speed value
0 rps
A rps or less
More than A rps, but B rps or less
More than B rps
Values of A, B
Item
A
More than three connection
B
More than two connection

(2) Operation of major functional components in heating mode

Operation
Functional
components
Compressor speed
Fixed
Indoor
fan
Automatic
Outdoor fan
Electronic
expansion valve
Compressor

(3) Defrost operation

(a) Starting conditions
(i)
(ii)
(iii)
(iv)
(Tho-A) (Tho-R) > = 0.44 × (Tho-A) + A
2 °C < = Tho-A
15 °C < = Tho-A <
Tho-A <
SCM50ZS-S1 SCM60ZM-S1
1.4 7.5 kW 1.5 7.8 kW
SCM50ZS-S1 SCM60ZM-S1
1.4 — 7.3kW
—
SCM50ZS-S1 SCM60ZM-S1
1.4 7.3 kW 1.5 7.6 kW
Decision speed
0 rps
A rps
A rps to B rps
B rps
Model
SCM50
Two connection
One connection
120 rps
Thermostat OFF
Heating
(All indoor units)
40
40
Tho-R
Tho-A A
2 °C
15 °C
SCM60
40 rps
30 rps
30 rps
90 rps
120 rps
Thermostat OFF
(Some of indoor units)
−
2
Tho-A
184
- -
'18 • SCM-T-251
Fan, stop, abnormal stop Failure
(Some of indoor units) (Outdoor unit)
satisfied
Tho-R