FarmTek MWH-180 Installation And Operating Instructions Manual Download Page 39 | Manualshive

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VENT PIPE INSTALLATION

• Use only designated vent terminal (sold separately).
• Install correctly in accordance with the installation manual attached.
• Select the correct switch position depending on the length of  the vent pipe.
• Make sure that the proper distance, within the limitations, is determined between the unit and the
termination of  the vent pipe.
• Make sure the terminal of  the vent pipe sticks out outdoors.
• Prevent the exhaust gas from flowing back indoors through the gap between the termination and
the wall where the vent pipe penetrates.
• Make sure snow drift will not suffocate the vent terminal when it has been piled or fallen.
• Do not place hazardous materials near the end of  the vent termination.
• Make sure to install the vent terminal at downward slope to prevent rain from entering inside.
• Some vapor or condensation may be generated from the vent terminal.
• Place the vent terminal where it is not affected by water splashing or falling off  the roof  eaves.
• A vent system that exits the structure through a sidewall shall terminate not less than 12"
(30.5cm) above the ground.
Check local codes and ordinances which may require higher clearances.
• The termination of  the vent system shall not be located in public traffic areas, such as walkways,
unless the vent system is at least 7' (2.1m) above the ground.
• Terminate the system 6' (1.8m) from the combustion air intake of  any appliance.
• Place the system at least 3' (0.9m) away from any other building opening, gas utility meter,
service regulator or the like, or less distance if  specified in the appliance's instructions.
And also ensure that positioning of  the vent system complies with the requirements of
AS5601/AG601 Clause 5.13.6.2/Fig. 5.3

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Summary of Contents for MWH-180

Page 1: ...Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be performed by a qualified installer service agency or the gas supplier INSTALLER Leave this manual w...

Page 2: ...ROUBLE SHOOTING AND SOLUTION 24 EXPLODED VIEW 25 26 PARTS LIST 27 INSTALLATION INSTRUCTIONS 28 31 DIMENSIONS 32 TEMPLATE OF L TERMINATION INSTALLATION 33 SUGGESTED PIPING BASIC INSTALLATION 34 SUGGESTED PIPING CIRCULATION SYSTEMS 35 VENT PIPE INSTALLATION 36 39 HIGH ALTITUDE 40 VENT PIPE INSTALLATION 41 53 GAS LINE SIZING CHARTS 54 GAS PIPING 55 WATER PIPING 55 PRESSURE RELIEF VALVE 56 ELECTRICAL ...

Page 3: ...1 h t d i W m m 0 1 2 8 3 8 h t p e D t h g i e W s b l 3 4 s n o i t c e n n o C T P N M 4 3 s a G T P N M 4 3 t e l n i r e t a W T P N M 4 3 t e l t u o r e t a w t o H m e t s y s n o i t i n g I n o i t i n g i c i n o r t c e l e t c e r i D n o i t p m u s n o c l a c i r t c e l E s t t a w 1 6 l a m r o N s t t a w 7 3 n o r e l l o r t n o c e t o m e r h t a B n i a M y b d n a t S s t ...

Page 4: ...of heater 2 5 1cm 6 15 2cm for reading of labels Back of heater 0 0cm Floor 12 30 5cm Vent pipe 0 0cm SPECIFICATIONS M U M I X A M M U M I N I M n o i t p m u s n o c s a G s a G l a r u t a N h u t B 0 0 0 0 8 1 h u t B 0 0 0 0 2 s a G e n a p o r P h u t B 0 0 0 0 8 1 h u t B 0 0 0 0 2 e r u s s e r p y l p p u s s a G s a G l a r u t a N C W 5 0 1 C W 4 s a G e n a p o r P C W 4 1 C W 8 e r u s...

Page 5: ...or to continuously maintain the outgoing water temperature The safety protections of the microprocessor include limiting the maximum temperature of the hot water The maximum temperature of water without using the remote controllers is preset at 120ºF A fault monitor will display malfunction codes on the remote controllers This simplifies trouble shooting during service calls The MWH 180 is designe...

Page 6: ... the instruction is neglected and the unit is mishandled Warning indicates the possibility that serious injuries or even death to the user may result if the instruction is neglected and the unit is mishandled Caution indicates the possibility that some injuries to the user and or material damage may result if the instruction is neglected and the unit is mishandled Each mark indicates General instr...

Page 7: ...eds The blockage may cause the leakage of the exhaust gas indoors during operation which is dangerous Check for gas leak May cause fire If a gas leak is noticed stop using the unit immediately and close the gas valve then contact your service person or the gas supply company Do not light any appliance disconnect connect the power plug or touch any electric switch Close the main gas valve in case t...

Page 8: ... HEATER FOR INDOOR INSTALLATION NATURAL GAS PROPANE GAS CHAUFFE EAU INSTANTANÉ AUTOMATIQUE À ÉVENT DIRECT POUR INSTALLATION INTÉRIEUR NAT GPL ANSI Z21 10 3 2004 CSA 4 3 2004 Wiring Diagram inside Front Cover Schéma du câblage derrière le couvercle avant Minimum clearances from combustible of non combustible construction Dégagements minimaux à assurer entre les parois de l appareil et les constucti...

Page 9: ...ms May cause fire or explosion Do not place any flammable items such as gasoline benzene or spray cans near the appliance Do not use them around the heater or the exhaust vent terminal Take special care No rubber piping May cause gas leakage or fire Rubber pipe should never be used for gas piping line Do not go out or sleep while leaving the hot water running No installation outdoors or in the bat...

Page 10: ...ot touch Do not use hair spray or spray detergent in the vicinity Do not install in locations where excessive dust or debris will be in the air Do not turn off the water heater or change the water temperature while someone is bathing or washing That may result in scalds or burns Spray Prohibited Prohibited Prohibited Do not wipe remote controller with gasoline benzene or detergents Prohibited ...

Page 11: ...dio it may cause picture disturbance or sound disturbance Flame logo indicator Check Check Check Measures to be taken for lightning possibility May cause failure Temporary voltage surge caused by lightning can damage the electronic parts Turn off the main power when you hear thunder Provide adequate space around the unit for service Make sure to have enough room around the unit to ensure space nec...

Page 12: ...erwise the lime may harden and deposit in the pipe causing lower efficiency and damage to the unit refer to page 14 The MWH 180 is designed primarily for single family home use Notice If used in a commercial application a limited warranty applies Water or hot water left in the unit for a long time is not suitable for drinking or cooking Do not drink or use for cooking designated part Check Check P...

Page 13: ...ve all wet clothing quickly Wet clothing retains the heat 2 Apply cold water for 30 minutes Immediately submerge the burnt area in cold water for 30 minutes to reduce the heat in the skin preventing deeper burning Never use butter oils or ointment to cover the burn They may retain the heat 3 Keep the scalded person warm Place a blanket around the person 4 Seek medical advice Call your medical advi...

Page 14: ...ure PRIORITY Button Priority button to set the water temperature in Bath remote controller PRIORITY Indicator Indicates this controller has priority control over the other controller Indicates this controller has priority control over the other controller PRIORITY Indicator ON Indicator Indicates power is on to the system ON OFF Button Power switch to operate this control Digital Monitor Indicates...

Page 15: ...WN button located on the controller PRIORITY control change The temperature can only be controlled by the remote controller which has the priority indication Priority button is only located on the Bath remote controller When the priority switch is turned on priority control over the water temperature is changed voluntarily Do not turn off the water heater or change the water temperature while some...

Page 16: ...n case the unit is used in the lime rich water hard water area make sure to flush the residual hot water away Otherwise lime may harden and deposit in the pipes causing low efficiency and damage to the unit Contact a qualified MPI service technician to remove lime once a year Failure to perform the annual maintenance will cause malfunction or damage to the heat exchanger Damage caused by the lime ...

Page 17: ...ontroller s If the remote controller was turned ON when power is restored the remote controller will be ON and the unit will automatically reset and deliver hot water on demand If the remote controller has been shut OFF it will remain OFF After power is restored and the remote controller is turned back ON the unit will be ready to use at the next demand for hot water If an error code appears befor...

Page 18: ...old temperature 10ºF the anti frost heater may not be sufficient The following step 2 or 3 should be tried to avoid freeze up 1 Close the main gas valve This helps prevent freezing of the pipes and the valves as well Check the flow volume 30 minutes after this procedure as the flow may fluctuate Notice 3 Turn off the main power Close PREVENTION OF FREEZING DAMAGE DURING WINTER SEASON Prevention of...

Page 19: ...r drain stopper 5 Turn off the main power This is the best method for protecting the unit Although freeze prevention is not possible for the pipe and the valve When operation is resumed put the water filter drain stopper back on and check if water runs from the hot water faucet by turning on the main water supply valve Notice Close 2 Close the main water supply valve PREVENTION OF FREEZING DAMAGE ...

Page 20: ... to turn the gas control knob Never use tools If the knob will not turn by hand do not try to repair it call a qualified service technician Force or attempted repair may result in a fire or an explosion D Do not use this appliance if any part has been under water Immediately call a qualified service technician to inspect the appliance and to replace any parts of the control system and any gas cont...

Page 21: ...y lights the burner Do not try to light the burner by hand 4 Turn the manual valve installed on the gas supply line clockwise to the full OFF position 5 Wait 5 minutes to clear out any gas If you then smell gas STOP Follow B in the safety information above on this manual If you do not smell gas go to next step 6 Turn the manual valve installed on the gas line counterclockwise to the full ON positi...

Page 22: ...er is leaking from the unit or the inlet or outlet pipes Make sure to keep the area surrounding the unit and the exhaust outlet clear of any combustibles and hazardous materials GASOLINE Carry out the inspection and maintenance after the unit is shut down and cools off Turn the gas valve off and disconnect the power supply Pay full attention to any sharp edges on metal parts when doing inspection ...

Page 23: ...a repair is required Scheduled inspection An inspection is necessary for the unit after it has operated for a long period The annual inspection of at least once a year is recommended IN CASE THE UNIT REMAINS UNUSED FOR A LONG TIME Remove the water in the unit in accordance with Prevention of freezing 3 By removing water in unit as freezing may cause damage to the unit refer to page 17 in case the ...

Page 24: ...e h t g n i o g t u O r e t n e c e c i v r e s l l a C 1 3 3 0 1 e g a k a e r b e r i w r o t s i m r e h t r e g n a h c x e t a e H r e t n e c e c i v r e s l l a C 1 4 3 1 1 e g a k a e r b e r i w r o t s i m r e h t r i A r e t n e c e c i v r e s l l a C 1 1 6 7 e r u l i a f r o t o m n a F r e t n e c e c i v r e s l l a C 1 5 6 9 e r u l i a f e c i v e d l o r t n o c w o l f r e t a ...

Page 25: ...ccurrences ago 6 Alarm 6 occurrences ago 7 Alarm 7 occurrences ago 8 Alarm 8 occurrences ago If no alarm has been input indicated by hyphen 3 Clearing alarm record During alarm record monitor mode you can clear alarm record index alarm record 1 8 and combustion period during alarm by pushing ON OFF button for 10 consecutive seconds Clearing of compiled number of alarms shall not be done In case th...

Page 26: ...o f g n i n n u r s p e e k r e w o l b e h T t e c u a f r e t a w t o h e h t r e t f a e l i h w t u h s d e n r u t s i e h t e g r a h c s i d o t s d n o c e s 5 6 t u o b a r o f n u r o t s e u n i t n o c t I r e b m a h c n o i t s u b m o c e h t n i s a g t s u a h x e w o l f d n a e r u t a r e p m e t r e t a W e m o c e b s e m i t e m o s e m u l o v y d a e t s n u e s a c n i e ...

Page 27: ... 25 EXPLODED VIEW H I L K E F C A 21 62 32 19 3 20 17 6 22 31 29 30 28 53 54 50 52 51 47 61 38 55 56 45 45 14 63 23 24 48 49 36 1 7 18 34 25 37 39 35 37 25 ...

Page 28: ... 26 EXPLODED VIEW 12 60 A L H I 10 8 K J D C F 41 B E J D 26 46 44 25 25 13 16 11 59 56 57 58 40 42 43 42 5 9 15 27 4 2 41 40 18 57 ...

Page 29: ...C e t o m e R n i a M 6 1 6 1 7 3 y l b m e s s A e c i v e D l o r t n o C w o l F r e t a W 9 4 9 4 7 3 0 5 2 2 T S Y r e l l o r t n o C e t o m e R h t a B 7 1 7 1 7 3 r e m r o f s n a r T r e t i n g I 0 5 0 5 7 3 s s e n r a H 8 1 8 1 7 3 r o t s i m r e h T 1 5 1 5 7 3 e r i W d a e L y l p p u S r e w o P 9 1 9 1 7 3 h c t i w S t a e H r e v O 2 5 2 5 7 3 e r i W d a e L e c i v e D l o ...

Page 30: ...rk indicates General prohibited Danger Warning Caution Never fail to do Ground Never install the unit outdoors as it is exclusively for indoor use Do not install it in the bathroom Electric shock or leakage may result Danger Read and 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 inst...

Page 31: ...EATER FOR INDOOR INSTALLATION NATURAL GAS PROPANE GAS CHAUFFE EAU INSTANTANÉ AUTOMATIQUE À ÉVENT DIRECT POUR INSTALLATION INTÉRIEUR NAT GPL ANSI Z21 10 3 2004 CSA 4 3 2004 Wiring Diagram inside Front Cover Schéma du câblage derrière le couvercle avant Minimum clearances from combustible of non combustible construction Dégagements minimaux à assurer entre les parois de l appareil et les constuction...

Page 32: ...to hook on 2 Hook the center hole of the wall hanging bracket onto the screw and securely fix the unit with 4 screws 3 Adjust the clearance between the unit and the wall by loosening 8 hexagon head screws upper and lower and then securely fix the unit so it is level Screw for wall hanging Wall hanging bracket Screw for wall hanging Wall hanging bracket About 1 8 4mm 24 11 32 618mm Screw for wall h...

Page 33: ...age to electronic components Do not install the vent terminal near the outlets of the other appliances Install the air intake terminal away from the wind path as the wind may cause imperfect combustion Keep the vent terminal away from the wall or the overhangs as far as possible even if it is noncombustible in order to prevent discoloration and staining caused by the exhaust gas Do not install the...

Page 34: ...46mm 4 5 16 110mm 24 17 32 623mm 24 1 32 610mm 8 9 32 210mm 3 5 8 92mm 1 5 16 33 5mm 13 25 32 350mm 6 5 8 168mm 4 15 32 113 5mm 3 13 16 97mm 4 1 16 103mm 3 13 16 97mm φ5 φ127mm φ3 1 8 φ79mm 22 27 32 580mm 2 21 32 67mm DIMENSIONS ø ø ø ø ...

Page 35: ...mber the diameter of opening the range of wall thickness 100 250mm 250 450mm 450 650mm 100 250mm 250 450mm 450 650mm ø144 150mm ø147 150mm ø154 175mm ø144 150mm ø147 150mm ø154 175mm The diameter of the wall opening does not need to be increased if the wall opening is pitched DOWNWARD towards the outside at a 2º 1 4 in ft pitch MPI P N 3810 3811 3812 3813 3814 3815 3 5 16 84mm 6 5 8 168mm Holes re...

Page 36: ...e Valve 3 Valve 4 Pressure relief valve Drain 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 Valve 2 Valve 1 ...

Page 37: ...as 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 may vary depending on installation location Confer with local building officials before installation Union Union Valve 3 Valve 4 Valve 2 Valve 1 SUGGESTED PIPING CIRCULATION SYSTEMS ...

Page 38: ...10 000 Btuh 3kW 12 inches 30cm for appliances 10 000 Btuh 3kW and 100 000 Btuh 30kW 36 inches 91cm for appliances 100 000 Btuh 30kW 6 feet 1 83m 7feet 2 13m 3 12 inches 30cm 4 US Installations 2 12 inches 30cm 6 inches 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 ...

Page 39: ...al at downward slope to prevent rain from entering inside Some vapor or condensation may be generated from the vent terminal Place the vent terminal where it is not affected by water splashing or falling off the roof eaves A vent system that exits the structure through a sidewall shall terminate not less than 12 30 5cm above the ground Check local codes and ordinances which may require higher clea...

Page 40: ...witch No 8 OFF In case D value is less than 15 set both dip switch No 7 No 8 OFF Factory setting No 7 No 8 ON Dip switch on PCB 1 2 3 4 5 6 7 8 OFF In case extension of the vent pipe is required it shall be limited to the maximum of 41 12 5m based on the formula below However the maximum height of the vent pipe is limited to 23 feet Calculate D distance value according to the length of the vent pi...

Page 41: ...fully Failure to follow the installation instructions could cause not only the lower performance of appliance but also property damage or personal injury Different manufactures have different joint systems and adhesives Do not mix pipe fitting or joining methods from different manufacturers Examine all components for shipping damage prior to installation Note In case D value is longer than 41 the ...

Page 42: ...combustion at higher altitudes the fan has following 2 type settings with 2 dip switches No 7 No 8 in each D value Both dip switch No 7 No 8 ON is factory setting Depending upon the vent length dip switch No 7 No 8 on PCB may need to be adjusted to compensate fan speed Read the following instructions to determine which position this switch should be placed in In case D value is 12 and above leave ...

Page 43: ...facturers Examine all components for shipping damage prior to installation Note In case D value is longer than 34 for Natural Gas the unit shall be relocated with vent length of less than 34 In case D value is longer than 18 for Propane Gas the unit shall be relocated with vent length of less than 18 In case vent pipe requires extension use coaxial vent pipe and elbows and start from the vent term...

Page 44: ...N Items of vent system General installation requirements Items shown below in TABLE 1 are used for this vent system The diameters of pipes are 3 1 79mm for inner vent pipe and 5 127mm for outer air intake pipe The length of the items are shown in Fig 1 TABLE 1 Items Vent length Length 300 11 8 Length 600 24 01 Length 900 35 4 Adjustable Length 175 230 6 9 9 1 Adjustable Length 215 310 8 5 12 2 45º...

Page 45: ... N 3808 Rain Cap MPI P N 3818 Air Intake Pipe MPI P N 3817 Model Number FFTA200 FFTA260 6 9 9 1 8 5 12 2 175 230mm 215 310mm L 50 50 L 50 Roof Flashing cap MPI P N 3820 Roof Flashing base MPI P N 3820 Roof Flashing adapter L MPI P N 3804 3805 MPI P N 3821 3822 L Termination Refer to TABLE 2 page 46 FFT 7U L 167 196 50 50 40 5 0 125 50 205 190 1 2 120 4 79 80 127 6 L2 305 or 365 L1 78 8 120 112 2 1...

Page 46: ...icates which method should be used Vent pieces should not be cut a Mainly method a is used for connection and detachment It s for Horizontal terminations straight termination and L termination vent lengths drain tee and reducer Fig 2 Joint connection and detachment method a b Slide piece Into cover Stopper bead Stopper bead Male end Female end Slide piece Male end Female end Male end Stopper bead ...

Page 47: ...ng cap confirm that the end of air intake pipe reaches the outer bead of roof flashing cap because the screw section is hidden in outer pipe When disconnecting them turn counterclockwise Fig 3 Joint connection and detachment method b Female screw Rain cap Air intake pipe Roof flashing cap Female screw Male screw Turn clockwise till the end of air intake pipe reaches the outer bead of roof flashing...

Page 48: ... because it may cause vent gas leaks Drain tee Connect the drain tee directly on to the appliance flue outlet as shown in Fig 4 4 page 45 Attach one end of a drain hose to the drain tee outlet and the other end to a condensate drain so that any steam or condensed water will be handled properly The drain hose must be suitable for use with acidic effluent Follow the appliance manufacturer s instruct...

Page 49: ...able lengths and elbows as shown in Fig 4 3 If vent system has vertically installed lengths longer than 5 1 5m or has 3 elbows install drain tee direct on the appliance flue outlet and male male adapter before horizontal lengths as shown in Fig 4 4 The directions of lengths are different between Fig 4 3 and Fig 4 4 A continuously DOWNWARD slope of no less than 2º 1 4 in ft is maintained in the hor...

Page 50: ... 9 Insert the termination into the sleeve from inside wall so that 4 studs on sleeve plate are inserted into each 4 holes on termination plate and fasten the termination to the sleeve with the 4 nuts provided Ensure that the label on the termination is at the top 10 Ensure that the end of air intake pipe protrudes about 0 4 10mm from the sleeve 11 If using straight termination connect reducer on a...

Page 51: ...tal installation Seal between sleeve and wall Seal between sleeve and wall Seal between inner sleeve pipe and outer pipe Sleeve About 0 2 Stamped letter Packing UP Plug 4 Screws UP 3 10 4 5 6 7 8 9 11 Horizontal installation FFT 7U Horizontal installation FFT 7U L No less than 2º 1 4 in ft L termination Reducer No less than 2º 1 4 in ft Straight termination Reducer 90º elbow 12 4 Nuts UP Label ...

Page 52: ...en the condensation prevention plate with the screw provided if this plate is needed 9 Insert the termination into the sleeve from inside wall so that 4 studs on sleeve plate are inserted into each 4 holes on termination plate and fasten the termination to the sleeve with the 4 nuts provided Ensure that the label on the termination is at the top 10 Ensure that the end of air Intake pipe protrudes ...

Page 53: ... sleeve and wall Seal between inner sleeve pipe and outer pipe Sleeve About 0 2 Stamped letter Packing UP Plug 4 Screws UP 3 10 4 5 6 7 8 9 11 Horizontal extended installation without drain tee Horizontal extended installation with drain tee Reducer Support strap 90º elbow 5 1 5m Straight length No less than 2º 1 4 in ft No less than 2º 1 4 in ft Male male adapter Reducer Support strap 90º elbow 5...

Page 54: ...ined in the horizontal portion A typical installation is shown in Fig 7 It shall be limited to the maximum height 23 7m Refer to page 38 Vent Pipe Installation for maximum total length of vent pipe VENT PIPE INSTALLATION Vertical installation Rain cap Air intake pipe Maximum height 23 7m Maximum height 23 7m Roof flashing Drain tee Straight length Drain tee 90º elbow Vertical installation Rain cap...

Page 55: ...connecting order of them depend on the pitch of the roof shown in Fig 8 7 Fasten the bottom part of roof flashing cap or adapter to roof with screws nails or so on If the 4 holes at the 4 corners of the part is larger than screws or nails insert the 4 washers provided with the part 8 If roof flashing adapter is used connect roof flashing base to roof flashing adapter with the bolts provided with t...

Page 56: ...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 4 0 5 0 6 0 7 0 8 0 9 0 0 1 0 5 1 0 0 2 4 3 5 2 3 2 3 2 1 9 1 6 6 1 9 4 1 6 3 1 6 2 1 8 1 1 2 1 1 6 0 1 7 8 6 7 1 5 0 6 5 2 4 4 4 3 7 9 2 5 6 2 1 4 2 2 2 2 8 0 2 7 9 1 6 8 1 3 4 1 9 2 1 4 1 1 1 7 9 1 ...

Page 57: ...e test plug and fasten tightly Make sure to conduct gas leakage test before operating MWH 180 WATER PIPING Install a manual water control valve in the water inlet connection of MWH 180 A union should be used on both the hot and cold water supply lines for connection Use soldering materials or piping that will not cause any deterioration of potable water NO LEAD Purge the water lines to remove all ...

Page 58: ...t install 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 ELECTRICAL CONNECTION MWH 180 must be electrically grounded in accordance with local codes or in the absence of local codes with the most recent edition of the National Electrical Code ANSI NFPA 70 In Canada all electrical wiring to ...

Page 59: ...ill not activate 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 electrical shock provide a ground with resistance less than 100Ω An electrician should do this work Power supply lead wire Junction box Ground terminal Grounding screw Surge protector Power supp...

Page 60: ... 58 WIRING DIAGRAM ...

Page 61: ... 59 WIRING DIAGRAM ...

Page 62: ...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 C A n o i t i n g I r e t f A d o R e m a l F e t i h W A µ 0 2 1 C D n o i t i d n o C e m a l F h c t i w S t a e H r e v O 3 w o l l e Y w o l l e Y 1 w o l e B r e t i n g I 7 k c a l B k c a l B V 0 1 1 0 9 C A n o i t i d n o C g n i t i n g I e s u F l a m ...

Page 63: ...Burner Water Filter Water Flow Control Device Igniter Thermal Fuse Over Heat Switch Outgoing Thermistor Surge Protector PCB Fan Motor Air Thermistor Flame Rod Remote Controller Heat Exchanger Air Supply Duct Exhaust Duct Hot Water Outlet Water Inlet Gas AC120V Heat Exchanger Thermistor Water Flow Sensor Frost Sensing Switch Drain Plug ...

Page 64: ...l only depending on the distance from MWH 180 to the remote controllers Remote controller connection terminals Remote controller cable Cable clamp The appliance should always be disconnected from the power supply before REMOTE CONTROLLERS are connected Connect the cord to the terminal block of water heater As remote controller cables are nonpolarized they do not have specific plus and minus Be sur...

Page 65: ...e 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 spray of water from tea kettle or electrical pot Do not put Main remote controller in direct sunshine It is convenient to install it where it will be used most frequently Do not install Main remote co...

Page 66: ...the 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 an expansion bolt Reattach the cover and caulk with silicone around surrounding of the remote controller Wood screw Cover Cover Expansion bolt Remote controller cables BATH REMOTE CONTROLLER YST 225...

Page 67: ...on 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 remove the water in the unit and the pipe Refer to the instruction manual 1 Close the gas supply main valve 2 Close the water supply main valve 3 Take off the water filter drain stopper drain the valve...

Page 68: ... 3722 2 Manifold Assembly For conversion to Propane part 3724 1 Damper and part 3722 1 Manifold Assembly will be needed WARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or loss of life MPI P N 3722 1 3722 2 3724 1 3724 2 Description Manifold Assembly Propane Gas Manifold Assembly Natural Gas Damper Propane Gas Damper Nat...

Page 69: ...any screws are tightened Once it has been confirmed there are no obstructions and the Manifold can seal properly to the Gasket on the Burner as well as the Gas Valve O rings then all screws should be tightened firmly and evenly Step 4 The DIP Switches in the illustration below can be adjusted without removing the Circuit Board Familiarize yourself with their location and position then adjust numbe...

Page 70: ...n gas valve 2 Make sure the appliance is not in operation Then remove the screw from the Manifold pressure check inlet Do not mix the screw up with the front cover screws as they are the same type threads 3 Connect the hose of the manometer to the pressure check fitting 2 Adjusting Manifold pressure settings Minimum pressure should be set before setting the maximum pressure 1A Make sure that DIP S...

Page 71: ...ly valve Open the valve again for combustion Repeat steps 2 and 4 to check that the settings are correct 6 Shut the hot water supply valve to stop combustion Disconnect the rubber hose of the manometer from the pressure check fitting Seal the hole by installing and tightening the screw 7 Restart the unit with full water supply and check for any gas leakage at the pressure check screw and around th...

Page 72: ...al residential use Ready access to the MWH 180 for service is the responsibility of the owner Service and Repair Costs After the first year MPI will provide repair or replacement parts or product only under this limited warranty The owner will be responsible for any other costs incurred including labor costs for servicing or replacing the part or unit shipping delivery and handling of the replacem...

Page 73: ...e sales receipt cancelled check or a warranty registration card mailed to MPI within 30 days of purchase Legal rights This warranty gives you specific legal rights and you may also have other rights which vary from state to state NOTE Some states do not allow A Limitations on how long an implied warranty lasts or B The exclusion of limitation of incidental or consequential damages so the above lim...

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