Table of Contents
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Table of Contents
Summary of Contents for Monitor MWH180EX
- Page 1 MWH180EX Service Manual Instantaneous Gas Water Heater (Residential Outdoor Unit)
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Page 2: Table Of Contents
Table of Contents General Outline of Appliance Features ............................1 Specifications ..........................2 Performance ........................... 3 General Construction (Parts Names) ..................... 4 Main Component Structures ......................5 Main Safety Devices ........................9 Scale Build Up Alarm ........................10 Installation and Related Work INSTALLATION INSTRUCTIONS .................... -
Page 3: General Outline Of Appliance
1. General Outline of Appliance 1-1 Features 1. High-performance & high-capacity water heater features • Stable heating and supplying from 0.58 to 5.8 GPM with the proven temperature control method combining the feed forward, feedback and water flow control. • Design to reduce water temperature drops to hold temperature variation upon re-feeding •... -
Page 4: Specifications
1-2 Specifications Type of appliance Gas continuous flow water heater MWH-180EX Model number Outdoor only Installation Wall hanging Type of Hot water supply End stop system Exhaust system Forced combustion Power supply Appliance AC120V 60Hz Remote controller DC12V (digital) Ignition system Direct electronic ignition Outer panel material Pre-Painted Galvanized Steel Sheet... -
Page 5: Performance
1-3 Performance Performance-Capacity characteristic curves Inlet water temperature 6.3 GPM 6.3 GPM 5.8 GPM 41 F (5 C) 50 F (10 C) 59 F (15 C) 68 F (20 C) 77 F (25 C) 0.58 GPM 160 165 Hot water temperature [ F] With water temperature 41 F (5 C) at inlet With water temperature 50 F (10 C) at inlet 5.8GPM... -
Page 6: General Construction (Parts Names)
1-4 General Construction (Parts Names) Description Description Description Junction Box Front Panel Water Filter Assembly Heat Exchanger Thermistor Casing Assembly Drain Plug Manifold Assembly Heat Exchanger Water Flow Sensor Flame Rod Exhaust Chamber Assembly Surge Protector Electrode Gas Connection Water Flow Contorol Device Modulation Valve Unit Over Heat Switch Frost Sencing Switch... -
Page 7: Main Component Structures
1-5 Main Component Structures 1. Gas flow control device • Feeds the necessary amount of gas to heat water to a set temperature, based on the amount of water flowing in through the inlet measured by the water flow sensor and the water temperature calculation. - Page 8 OUT 2 OUT1 Diaphragm Coil LP 13A Plunger UP34-33C Plunger spring Pressure check hole Solenoid Valve Modulating Solenoid Valve Filter - 6 -...
- Page 9 2. Water flow sensor * Measures the water flow as its rotor (bladed wheel) spins with the passing water. The rotation of the rotor is detected by the sensor rotor (blade equipped with a magnet) of the wheel and the Hall element which calculates the water quantity. ø30 Main body Sealant...
- Page 10 4. Combustion control of rich and lean burners 1) Ignition start After the Main Gas Solenoid Valve, Gas Solenoid Valve 1, Gas Solenoid Valve 2 open respectively as required, the Gas Modulating Solenoid Valve, being held at the slow igni- tion position (with gas supply at a constant rate), operates to ignite rich burners and lean burners.
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Page 11: Main Safety Devices
1-6 Main Safety Devices 1. Water flow sensor (Boil-dry protection) When the water flow sensor detects the flow rate set for starting ignition (ignition water flow) or higher, the water heater starts operation. Ignition water flow: 0.71 GPM (2.7 L/min.) Extinction water flow: 0.58 GPM (2.2 L/min.) 2. -
Page 12: Scale Build Up Alarm
1-7 Scale Build Up Alarm Summary The temperature of residual hot water becoms higher as scale starts to build up inside the heat exchanger. The extent of scale build up is judged by monitoring the temperature of re- sidual hot water. “LC”, scale build up alarm, is indicated on the remote controller. Flow chart (See page 35) 1) The set temperature by remote controller needs to be 120F and over to activate the alarm. -
Page 13: Installation And Related Work
2. Installation and Related Work 2-1 INSTALLATION INSTRUCTIONS • The cases shown below are classified by the degree of risk and damage. Be sure to follow the instruction for your safety. "Danger" indicates that serious injuries or even death may result from the Danger improper installation due to negligence of following the instructions. -
Page 14: Before Installation
Debit calorifique max. MIN. INPUT SERIAL NUMBER 20,000 Btu/h 20,000 Btu/h Debit calorifique min. sticker. Manufactured for: MONITOR PRODUCTS INC. Ref.: New Jersey 20511040 GAS PRESSURE INLET MAX. 10.5 inches W.C. 14.0 inches W.C. Pression de gaz entr e max. - Page 15 Installation. Caution • Reinforce the wall if necessary as this unit weighs about 40lbs. 1. Twist 1 screw (for wall hanging) into the wall leaving about 1/8inches (4mm) length to hook on. 2. Hook the center hole of the wall hanging bracket onto the screw and securely fix the unit with 4 screws.
- Page 16 Caution • Check if adjacent wall or ceiling is fire resistant and allows safe distance for fire prevention. • This water heater is suitable for residential water (potable) heating only. Do not use this water heater for space heating, combination space heating/domestic water heating, or commercial water heating applications.
- Page 17 Installation. • Install the unit where there will be adequate distance from windows as shown in the diagram below. Pay special attention to distances from windows on adjacent buildings on both sides. Definition of Clearances from Openings in the Building Building openings refer to the windows of the building, or any openings resulting from an open door or sliding doors or windows.
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Page 18: Dimensions
2-2 DIMENSIONS 19/32" 13 25/32" 15/32" 6 1/2" (15mm) (350mm) (12mm) (165mm) 3 15/16" (100mm) 1 31/32" (50mm) 1 5/16" (33.5mm) 3 13/16" 4 15/32" (97mm) (113.5mm) - 16 -... -
Page 19: Suggested Piping-Basic Installation
2-3 SUGGESTED PIPING-BASIC INSTALLATION This drawing is intended only as a guide. It does not imply compliance with local building codes. Installation must be done in accordance with local building codes and may vary depending on installation location. Confer with local building officials before installation. Union Union Union... -
Page 20: Suggested Piping-Circulation Systems
2-4 SUGGESTED PIPING-CIRCULATION SYSTEMS This drawing is intended only as a guide. It does not imply compliance with local building codes. Installation must be done in accordance with local building codes and may vary depending on installation location. Confer with local building officials before installation. Union Union Union... -
Page 21: Vent Pipe Installation
2-5 VENT PIPE INSTALLATION Vent Terminal Clearances. INSIDE CORNER DETAIL. F I X E C L O S A B L E O P E R F I X E C L O S VENT TERMINAL. AIR SUPPLY INLET. AREA WHERE TERMINAL IS NOT PERMITTED. Canadian Installations US Installations Clearance above grade, veranda,... -
Page 22: Gas Line Sizing Charts
2-6 GAS LINE SIZING CHARTS Maximum Natural Gas Delivery Capacity in Cubic Feet per Hour (0.60 Specific Gravity, 0.5" WC Pressure Drop) " 2 " 4 " 1 " 4 " 2 Contact the Gas Supplier for Btu/Cubic Ft. " 2 of the Supplied Gas. -
Page 23: Gas Piping
2-7 GAS PIPING • Install the manual gas control valve in the gas inlet connection of MWH-180EX. • A union should be used to connect the unit and the gas pipe. • Check the gas type and the gas inlet pressure before connecting. •... -
Page 24: Pressure Relief Valve
2-9 PRESSURE RELIEF VALVE • Install an approved pressure relief valve with every gas water heater installation. • The pressure relief valve shall conform to the following requirements. Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems ANSI Z21, 22. - Page 25 • MWH-180EX requires 120V AC at 60Hz. Disconnect the power supply if the unit is not in use for a long time. • Remove residual water in the unit when the power supply is off because the freeze prevention in the unit will not activate, resulting in possible freezing damage. •...
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Page 26: Wiring Diagram
2-11 WIRING DIAGRAM - 24 -... - Page 27 - 25 -...
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Page 28: Diagnostic Points
2-12 DIAGNOSTIC POINTS e i l e i l e i l l l o e i l e i l o l l µ c t i o l l o l l ... -
Page 29: Schematic Diagram
2-13 SCHEMATIC DIAGRAM Heat Exchanger Over Heat Switch Frost Sensing Switch Heat Exchanger Thermistor Flame Rod Anti-Frost Heater Thermal Fuse Burner Electrode Igniter Fan Motor Solenoid Valve SV2 Remote Solenoid Valve SV1 Controller Water Flow Control Device Modulating Solenoid Valve Main Solenoid Surge Protector Valve... -
Page 30: Wiring Remote Controller
2-14 WIRING REMOTE CONTROLLER The Main remote controller model is CMR-2250. (P/N 3748) The Bath remote controller model is YST-2250. (P/N 3749) These controllers are to be fitted in the following locations: Main remote controller - kitchen or laundry. Bath remote controller - bathroom. Only one of each type of controllers can be connected to one MWH-180EX water heater. -
Page 31: Main Remote Controller Cmr-2250 (P/N 3748)
2-15 MAIN REMOTE CONTROLLER CMR-2250 (P/N 3748) 1) Safety precautions on Main remote controller installation. • Connect remote controller cable after heater is unplugged. • Never install Main remote controller above a combustion Bad examples appliance like hot plate or a kitchen range. The heat will cause electrical component problems, or deform the exterior. -
Page 32: Bath Remote Controller Yst-2250 (P/N 3749)
2-16 BATH REMOTE CONTROLLER YST-2250 (P/N 3749) 1) Safety precautions on Bath remote controller installation. • Before remote controller installation, check the hole position considering wall stud location. • Note : Do not dismantle the remote controller due to water-proof design. •... -
Page 33: Testing Operation
2-17 TESTING OPERATION • Follow the steps below, to ensure the MWH-180EX has been properly installed. Preparation for testing operation. 1. Fully open the water supply main valve. 2. Flush out the water supply piping to clean out any installation debris, clean out filter. 3.
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