Mitsubishi EHST20C-MHCW Manuals

Manuals and User Guides for Mitsubishi EHST20C-MHCW. We have 1 Mitsubishi EHST20C-MHCW manual available for free PDF download: Service Manual

Mitsubishi EHST20C-MHCW Service Manual (109 pages)

Brand: Mitsubishi | Category: Heat Pump | Size: 31.07 MB

Contents
1
Reference Manual
3
Safety Precaution
4
Refer to
4
Cautions for Service
6
Additional Refrigerant Charge
6
Service Tools
6
Specifications
7
Part Names and Functions
11
Outlines and Dimensions
13
Technical Drawings
13
Service Access Diagrams
14
Cylinder Unit
14
Wiring Diagram
15
Signal Inputs
15
Outputs
15
Room Thermostat
16
Flow Switch
25
DIP Switch Functions
33
Automatic Switch to Backup Heat Source Operation
33
Cylinder Unit
33
Field Wiring
34
Cylinder Unit Powered Via Outdoor Unit
34
Electrical Connections 1 Phase
34
Electrical Connections 3 Phase
35
Cylinder Unit Powered by Independent Source
36
Water System Diagram
38
Local System
40
1-Zone Temperature Control
40
2-Zone Temperature Control
40
2-Zone Temperature Control with Boiler
40
Filling the Cylinder Unit (Primary Circuit)
41
Filling the Cylinder Unit (Potable/Dhw Circuit)
41
Draining the Cylinder Unit
41
Controls
42
Main Remote Controller
42
Main Remote Controller Parts
42
Main Screen Icons
42
Setting the Main Remote Controller
43
Main Settings Menu
43
User Level – Short Press
43
Installer Level – Long Press
43
General Operation
43
Main Remote Controller Menu Tree
44
Service Menu
46
Manual Operation
46
Function Settings
46
Thermistor Adjustment
47
Auxiliary Settings
47
Economy Settings for Pump
47
Electric Heater (Heating)
47
Function Description
47
Mixing Valve Control
48
Flow Sensor
48
Heat Source Setting
48
Pump Speed
48
Operation Settings
49
Heating Operation
49
Simultaneous Operation
49
Cold Weather Function
49
Energy Monitor Settings
50
General Description
50
Calculation Internally
50
Actual Measurement by External Meter
50
Settings Using the Main Remote Controller
51
Demand Control(IN4)
51
Outdoor Thermostat (IN5)
51
Running Information
51
Summary of Settings
52
Error History
52
Password Protection
52
Resetting the Password
53
Manual Reset
53
SD Card
53
Completion Screen
53
Indoor Unit Switch Setting Display
55
Indoor Unit Only Operation
61
Emergency Operation
61
Troubleshooting
62
Test Run
62
Malfunction Diagnosis Method by Main Remote Controller
62
Self Diagnosis and Action
63
Indoor Unit Temperature Thermistor Failure
64
Circulation Water Freeze Protection
64
Heating Operation Error
65
Low Primary Circuit Flow Rate Detected by Flow Sensor
65
Troubleshooting by Inferior Phenomena
69
Cylinder Unit
69
Annual Maintenance
74
Checking Component Parts' Function
75
Thermistor Characteristics Charts
77
Test Point Diagram
78
FTC (Controller Board)
78
Disassembly Procedure
79
Preparation for the Repair Service
79
How to Remove the Front Panel
79
How to Remove the Main Remote Controller
79
How to Remove the Electrical Parts
80
How to Remove the Control Box
81
How to Remove Water Pump (Primary Circuit)/Pump Valve/Strainer Valve
82
Strainer Valve
83
Strainer Cover (Debris Recovery)
83
How to Remove the Flow Sensor
84
How to Remove the Booster Heater
85
How to Remove the Thermostat/Immersion Heater
87
How to Remove the Plate Heat Exchanger (P-HEX)
88
How to Remove the Pressure Relief Valve/Manometer/Air Vent
91
How to Remove the Expansion Vessel
93
How to Remove the Temperature and Pressure (T&P) Relief Valve
93
How to Remove the Air Vent (Manual)
93
How to Remove the Drain Cock (Primary Circuit)
94
How to Remove the Drain Cock (Sanitary Circuit)
94
How to Remove the Back Panel
99
How to Detach and Attach the Quick Connection
100
Notes on Replacing the Parts
101
Supplementary Information
102
Back-Up Operation of Boiler
102
Remote Controller Settings
102
Refrigerant Collecting (Pumpdown) for Split Model Systems Only
102
Service and Maintenance
103
Engineers Forms
103
Cylinder Unit
104
Annual Maintenance Log Book
105

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Mitsubishi EHST20C-MHCW Service Manual (109 pages)

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