Table of Contents
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COMMERCIAL ELECTRIC ENERGY SAVER
IMMERSION AND SURFACE MOUNTED
Manual 238-47174-00B
WATER HEATER
MII SERIES
THERMOSTAT MODELS
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
MII50(A)-*-**-(SF,CF,SCF)-***
MII80(A)-*-**-(SF,CF,SCF)-***
MII120(A)-*-**-(SF,CF,SCF)-***
*Denotes kW Rating
**Denotes Warranty Years
***Denotes Wiring Code
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Table of Contents
Related Manuals for Bradford White MII120 SF Series
Summarization of Contents
General Information
Thermostat Control Options
Describes Surface Mounted and Immersion Thermostats.
Model Number Decoding
Explains coding for model numbers.
Control System Diagrams
Visual layouts of Contactor and Surface Mounted models.
Component Functions and Operation
Explains thermostats, contactors, and elements.
Electrical Specifications and Data
Formulas, wiring, and current tables.
Sequence of Operation
Immersion Thermostat Models
Step-by-step operation with contactors.
Surface Mounted Thermostat Models
Step-by-step operation for surface mount.
600V Surface Thermostat Models
Step-by-step operation for 600V models.
Troubleshooting and Diagnostics
Heating Element Failures
Discusses dry firing, grounded elements, and sediment.
Quick Step Troubleshooting Guide
Table for diagnosing and correcting common issues.
Service Procedures: Testing
Heating Element Testing (MCE-I)
Procedures for testing elements for open or grounded faults.
Line Voltage Testing (MCE-II)
Procedures for checking input voltage.
Fuse Testing (MCE-III)
Procedure to check fuse continuity.
High Limit (ECO) Testing (MCE-IV, V, VI)
Procedures for testing ECO controls.
Thermostat Operation Testing (MCE-VII, VIII, IX)
Procedures for testing various thermostat types.
Contactor Testing (MCE-X)
Procedures for diagnosing contactor issues.
Service Procedures: Removal and Replacement
Thermostat Removal and Replacement (MCE-XI, XII)
Steps for surface and immersion thermostats.
High Limit (ECO) Control R&R (MCE-XIII, XIV)
Steps for ECO control removal and replacement.
Heating Element Removal and Replacement (MCE-XV)
Steps for removing and installing elements.
Anode Inspection and Replacement (MCE-XVI)
Steps for checking and replacing the anode.
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