background image

- 14 -

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.
 • MWH-180EX is not suitable for use in pool or spa applications.
 • Maintain proper space around the unit for proper servicing and operation. Minimum
   clearances from combustible materials are listed below.

        Note : These clearances do not apply if  installing unit into an MPI recess box, however
                   they do apply from the exhaust port to combustible once the exhaust port comes
                  out of  the recess box.

• Do not install MWH-180EX under an overhang less than 3feet from the top of  the unit.
   When the overhang protrudes out over MWH-180EX greater than 3feet, the area under
   the overhang must be open on 3sides.
 • When the water heater is installed within a recess box, the clearances from the top, bottom,
   sides, and back surfaces of  the recess box to combustible materials are 0inch.
   The clearance from combustibles from the front of  the recess box is 24inches.
 • Secure enough space so that the inspection and repairs can be done easily.
 • Secure space not only in front but also under the unit.
 • Do not install the unit over other combustion appliances such as gas cooking stove or a
   range.
   Oil residue and dust in the air can adhere to the burner and the heat exchanger resulting in
   deformation, loss of  efficiency, or damage to electronic components.
 • Do not install the exhaust outlet near the outlets of  the other appliances.
   Install the air inlets away from the wind path as the wind may cause imperfect combustion.
 • Do not install the unit where commercial chemicals are used.
   Those chemicals are ammonia, sulfur, chloride, ethylene compound and acids which are
   used at beauty shop, laundry, factory and so forth.
 • Do not install the unit over food or dishes.
 • Installer must install a Pressure relief  valve.
   Pipe pressure relief  to a drain or outside environment, or within 4inches of  the floor.
   Pipe pressure relief  discharge to a drain or outside environment. (refer to page 22)
 • The appliance should be located in an area where leakage from the unit or connections will
   not result in damage to the area adjacent to the appliance or to lower floors of  the
   structure. When such locations can not be avoided, it is recommended that a suitable drain
   pan, adequately drained, be installed under the appliance. The pan must not restrict
   combustion airflow.

Top of  heater
Front of  heater
Sides of  heater
Back of  heater
Floor

12"
24"
  6"
  0"
12"

(30.5cm)
(61.0cm)
(15.2cm)
(0cm)
(30.5cm)

Содержание MWH180EX

Страница 1: ...MWH180EX Service Manual Instantaneous Gas Water Heater Residential Outdoor Unit...

Страница 2: ...PIPING 21 2 9 PRESSURE RELIEF VALVE 22 2 10 ELECTRICAL CONNECTION 22 2 11 WIRING DIAGRAM 24 2 12 DIAGNOSTIC POINTS 26 2 13 SCHEMATIC DIAGRAM 27 2 14 WIRING REMOTE CONTROLLER 28 2 15 MAIN REMOTE CONTR...

Страница 3: ...design of the combustion burners allows the value of NOx to be lower than 55 ppm 3 Self diagnostic function Detects the scale clogging of the heat exchanger assembly warning Detects the blocked exhau...

Страница 4: ...F Noise level 49dB NOx 55ppm Max Safety devices Flame failure Flame rod Over heat switch 210 F Over heat limit 203 F Thermal fuse for heat exchanger 363 F Over current fuse 5A Automatic frost protect...

Страница 5: ...0 6 0 7 0 8 0 100 95 110 120 130 140 150 160 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 100 95 110 120 130 140 150 160 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 100 95 110 120 130 140 150 160 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8...

Страница 6: ...Heat Exchanger Thermistor Manifold Assembly Flame Rod Electrode 6 Modulation Valve Unit Gas Control Assembly Over Heat Switch bi metal switch 16 26 Frost Sencing Switch bi metal switch 7 8 9 10 Combu...

Страница 7: ...ce The plunger stops moving and stays at a certain position when the Upward and Down ward force are balanced As the plunger remains at the position the valve position of the Modulating Solenoid Valve...

Страница 8: ...6 Diaphragm Plunger Plunger spring Coil LP 13A 21 21 10 20 96 5 82 OUT 2 OUT1 127 7 UP34 33C 13A Modulating Solenoid Valve Solenoid Valve Filter IN Pressure check hole...

Страница 9: ...such temperature drops If the water flow is greater than the heater capacity a signal from the PCB activates the water flow control device s motor stepping motor In response to this operation the valv...

Страница 10: ...ximately 95 000 BTU is re quired both Gas Solenoid Valve 1 and Gas Solenoid Valve 2 are opened to burn with rich and lean burners while the gas supply is controlled by the Gas Solenoid Valve When the...

Страница 11: ...The system is activated to blow the fuse at 363 F 184 C 4 Over heat switch residual Even if the heat exchanger assembly is over heated by no water combustion every gas path is closed to avoid risks A...

Страница 12: ...residual hot water is detected by the thermistor of the can body when hot water flow is stopped The criterion for judging scale build up varies depending on combustion capacity 4 LC alarm and set tem...

Страница 13: ...understand the installation manual to carry out the installation as specified for proper and safe usage A competent dealer or plumber should perform the complete installation including placement plum...

Страница 14: ...aution for flammable items Do not touch water heater during or immediately after operation Do not use any gas other than specified on the sticker MWH180EX ONLY FOR USE WITH REFER TO THE LOCAL GAS AUTH...

Страница 15: ...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 Screw for wall hanging Wall hanging bracket Scre...

Страница 16: ...one easily Secure space not only in front but also under the unit Do not install the unit over other combustion appliances such as gas cooking stove or a range Oil residue and dust in the air can adhe...

Страница 17: ...sliding window Do not install the unit so that the exhaust gas directly hits against any reinforced glass plate The glass may crack or break due to the exhaust heat Do not install the unit near plants...

Страница 18: ...16 23 1 32 585mm 22 5 8 575mm 13 25 32 350mm 3 15 16 100mm 2 3 8 60mm 1 5 16 33 5mm 4 15 32 113 5mm 3 13 16 97mm 2 25 32 71mm 3 9 16 97mm 1 31 32 50mm 6 1 2 165mm 19 32 15mm 15 32 12mm 2 2 DIMENSIONS...

Страница 19: ...ve Valve 3 Valve 4 Pressure relief valve Drain Union Union Union This drawing is intended only as a guide It does not imply compliance with local building codes Installation must be done in accordance...

Страница 20: ...supply Union Shut off valve Union 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...

Страница 21: ...ches 15cm for appliances 10 000 Btuh 3kW 9 inches 23cm for appliances 10 000 Btuh 3kW and 50 000 Btuh 15kW 12 inches 30cm for appliances 50 000 Btuh 15kW 6 inches 15cm for appliances 10 000 Btuh 3kW 9...

Страница 22: ...7 5 2 6 9 5 5 9 0 5 1 7 4 0 4 4 5 1 4 3 9 3 0 2 3 7 7 2 2 4 3 9 2 8 7 0 2 8 9 6 1 2 7 4 1 7 1 3 1 3 0 2 1 4 1 1 1 2 4 0 1 3 8 9 3 3 9 2 6 7 1 6 6 e z i S e p i P t e e F n i h t g n e L 0 1 0 2 0 3 0...

Страница 23: ...sten tightly Make sure to conduct gas leakage test before operating MWH 180EX 2 7 GAS PIPING 2 8 WATER PIPING Install a manual water control valve in the water inlet connection of MWH 180EX A union sh...

Страница 24: ...nstall any depressurizer or restriction device in the relief line Manually operate the pressure relief valve at least once a year to check if it functions properly 2 10 ELECTRICAL CONNECTION MWH 180EX...

Страница 25: ...tivate resulting in possible freezing damage Do not let the power cord contact the gas piping The grounding screw is located in the junction box attached to the outside of bottom plate To prevent elec...

Страница 26: ...24 2 11 WIRING DIAGRAM...

Страница 27: ...25...

Страница 28: ...g n i v l o v e R e u l B e g n a r O V 6 2 C D n o i t i d n o C g n i v l o v e R e u l B e t i h W V 2 1 8 C D n o i t i d n o C g n i v l o v e R d o R e m a l F 3 n e e r G e t i h W V 0 5 1 0 5...

Страница 29: ...lve Solenoid Valve SV1 Burner Water Filter Water Flow Control Device Igniter Thermal Fuse Over Heat Switch Outgoing Thermistor Surge Protector PCB Fan Motor Flame Rod Remote Controller Heat Exchanger...

Страница 30: ...l only depending on the distance from MWH 180EX to the remote controllers Remote controller connection terminals Remote controller cable Cable clamp The appliance should always be disconnected from th...

Страница 31: ...ve a combustion appliance like hot plate or a kitchen range The heat will cause electrical component problems or deform the exterior Install Main remote controller out of the reach of steam water drop...

Страница 32: ...covers with catching the bottom corner s slot with nail Do not tighten the screws excessively as the screw hole may be damaged In case of mounting the remote controller on tile cement or mortar use a...

Страница 33: ...tion or the unit will not be used for an extended time the residual water in the unit and the pipe may freeze and damage the unit or the residual water in the heat exchanger may deteriorate Be sure to...

Отзывы: