FarmTek MWH-180 Installation And Operating Instructions Manual

Gas continuous flow water heater residential indoor unit, manufactured home (mobile home)

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INSTALLATION AND OPERATING

Residential indoor unit,

Manufactured home (mobile home)

WARNING : If the information in this instruction is not followed exactly, a fire or

explosion may result causing property damage, personal injury or death.

- Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or

any other appliance.

- WHAT TO DO IF YOU SMELL GAS

• 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 with the appliance.

CONSUMER : Retain this manual for future reference.

INSTRUCTION

Model MWH-180

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Summary of Contents for FarmTek MWH-180

Page 1 INSTALLATION AND OPERATING INSTRUCTION Model MWH-180 Residential indoor unit, Manufactured home (mobile home) WARNING : If the information in this instruction is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. - Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
Page 2: Table Of Contents
INDEX SPECIFICATIONS ---------------------------------------------------------------------------- 1,2 PERFORMANCE ------------------------------------------------------------------------------ 2 FEATURES ------------------------------------------------------------------------------------- 3 FOR YOUR SAFETY READ BEFORE OPERATING -------------------------------- 4-10 ABOUT HOT WATER ------------------------------------------------------------------------ 11 SCALDS - FIRST AID ------------------------------------------------------------------------ 11 REMOTE CONTROLLER OPERATION ------------------------------------------------ 12,13 USE IN THE LIME-RICH WATER (HARD WATER) AREA ------------------------ 14 CAUTION ---------------------------------------------------------------------------------------- 15 PREVENTION OF FREEZING DAMAGE DURING WINTER SEASON -------- 16,17 FOR YOUR SAFETY READ BEFORE OPERATING -------------------------------- 18...
Page 3: Specifications
SPECIFICATIONS a i l l l a l l a º 0 e l l º 0 " 2 " 2 " 8 " 4 l n i " 4 " 4 l l o f - i i n i a i l l l o i g i...
Page 4: Performance
SPECIFICATIONS Flame failure - Flame rod Over heat switch 212º F Over heat limit 203º F Safety devices Thermal fuse 363º F Automatic frost protection Fan motor rpm check - PCB Over current - Fuse (5 amp) CMR-2250(P/N 3748) Main control kitchen / laundry Remote controller (option) YST-2250(P/N 3749) Bathroom control...
Page 5: Features
120ºF . For optimal performance, we recommend the use of the optional remote controllers. The MWH-180 will never run out of hot water. Hot water is available as long as a hot water faucet is open.
Page 6: For Your Safety Read Before Operating
FOR YOUR SAFETY READ BEFORE OPERATING For your safety and proper use of the unit. Read and understand the following important symbols before use. The cases shown below are classified by the degree of risk and damage. Be sure to follow the instruction symbols for your safety. "Danger"...
Page 7 FOR YOUR SAFETY READ BEFORE OPERATING Danger Unfastening of the vent pipes can cause a shortage of oxygen, fire, or overheating. Check Check to make sure the flue pipe or vent pipe is properly connected. Leaking exhaust gas indoors poses a danger if the pipes are unfastened during operation. Blockage in the vent pipes.
Page 8 ANSI Z21.10.3-2004 INSTALLATION INTÉRIEUR. CSA 4.3-2004 NAT / GPL MODEL : MWH-180 NATURAL GAS (Gaz Naturel) PROPANE GAS (GPL) REFER TO THE LOCAL GAS AUTHORITY FOR CONFIRMATION ON THE GAS TYPE, IF IN DOUBT. DO NOT REMOVE THIS LABEL UNTIL THE APPLIANCE HAS BEEN INSTALLED AND TESTED.
Page 9 FOR YOUR SAFETY READ BEFORE OPERATING Warning Pay attention to children. (cause of accident.) Disassembly, repair or modification of the unit may cause fire, electric shock or other accidents. Do Not Disassemble Prohibited Do not disassemble or modify the units. Never fail to ask for professional assistance Do not allow small children to play in the from your dealer for installation, removal,...
Page 10 FOR YOUR SAFETY READ BEFORE OPERATING Caution Be sure to electrically ground the unit. Do not touch the exhaust vent pipe and water heater during or immediately after operation. Ground Do not touch Do not use hair spray or spray detergent in Do not install in locations where excessive the vicinity.
Page 11 FOR YOUR SAFETY READ BEFORE OPERATING Caution Confirm ignition, combustion and extinction. Do not allow the remote controller to get wet. (May cause controller to fail.) Check Flame logo indicator Check Always check Flame logo indicator for combustion and that the unit has shut down by checking the operation lamp on the Main or Bath remote controller.
Page 12 Drain the residual hot water in the unit away. Otherwise 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. Prohibited Check...
Page 13: About Hot Water
ABOUT HOT WATER Hot water heater temperature over 125ºF can cause severe burns instantly or death from scalding. Children, disabled and elderly are at the highest risk of scalding. Feel water temperature before bathing or showering. Warning HOT!! BURN SCALDS - FIRST AID 1.
Page 14: Remote Controller Operation
REMOTE CONTROLLER OPERATION CMR-2250 (P/N 3748) (Main remote controller) This remote controller is intended to be used in the kitchen, laundry room or utility area. Digital Monitor Indicates the selected water temperature. Flame Logo Indicator Error messages flash in the event of a failure. Indicates that a hot water faucet is open and that control of the temperature...
Page 15 REMOTE CONTROLLER OPERATION Operation of Main/Bath remote controller. Please read these instructions carefully before using this appliance. 1. Turn on the ON/OFF button. (refer to page 12.) 2. The temperature display will illuminate at 108ºF. 3. The priority indicator will illuminate. 4.
Page 16: Use In The Lime-Rich Water (Hard Water) Area
USE IN THE LIME-RICH WATER (HARD WATER) AREA Caution In 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.
Page 17: Caution
CAUTION The residual water in the unit. Do not drink or cook with any of the water left in the unit or in the pipe for a long time because the quality may have deteriorated. Power failure in winter. Prevent freezing by following steps “ (2) By running water from any faucet. ” or “...
Page 18: Prevention Of Freezing Damage During Winter Season
PREVENTION OF FREEZING DAMAGE DURING WINTER SEASON Prevention of freezing. The unit or pipe is likely to be damaged by freezing, not only in the cold latitudes, but also in the mild-temperature zones in winter season. Pay careful attention to prevent freezing pipes. (1) Anti-frost heater.
Page 19 PREVENTION OF FREEZING DAMAGE DURING WINTER SEASON (3) By removing water in unit as freezing may cause damage to the unit. 1. Close the main gas valve. 2. Close the main water supply valve. Close Close 3. Turn on the hot water faucet. 4.
Page 20: For Your Safety Read Before Operating
FOR YOUR SAFETY READ BEFORE OPERATING WARNING : If you do not follow this instruction exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is equipped with an ignition device that automatically lights the burner.
Page 21: Operating Instructions
OPERATING INSTRUCTIONS 1. Stop! Read the safety information mentioned previously before proceeding. 2. Turn off all electric power to the appliance. 3. This appliance does not have a pilot. It is equipped with a direct ignition device that automatically lights the burner. Do not try to light the burner by hand. 4.
Page 22: Daily Inspection And Maintenance
DAILY INSPECTION AND MAINTENANCE Tips for the inspection. Caution 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 and maintenance, as they may cause some injuries.
Page 23: In Case The Unit Remains Unused For A Long Time
DAILY INSPECTION AND MAINTENANCE Maintenance. (as required.) Dust. Cleaning the water filter. (drain stopper.) Close Close the main water supply, open a hot Wipe away dust and stains on the outside water faucet to relieve any water pressure, surface of the unit with a cloth or a sponge take the water filter (drain stopper) out, and soaked in neutral detergent.
Page 24: Fault Monitor
FAULT MONITOR Fault monitor. The MPI water heater has a self diagnosing function for faults. When the unit does not operate correctly an error code is displayed on the Main and Bath remote controllers digital monitor. The cause of the fault can be determined after checking the fault numbers indicated on the remote controller digital monitor.
Page 25 FAULT MONITOR Alarm record monitor mode Alarm record can be monitored by special operation of remote controller 1. Start up of alarm record calling mode. While ON/OFF button is OFF , alarm record calling mode is obtained by simultaneously pushing both UP/DOWN buttons ( ) at Main or Bath remote controller for 5 consecutive seconds.
Page 26: Trouble Shooting And Solution
TROUBLE SHOOTING AND SOLUTION The following problems are not a malfunction or defect. Check again before asking for servicing. l a i i n i l l i c i t y l l t t i l a l i .
Page 27: Exploded View
EXPLODED VIEW - 25 -...
Page 28 EXPLODED VIEW - 26 -...
Page 29: Parts List
PARTS LIST t s i t s i p i l t s i p i l p i l l l a t l i p i l l l o l l o t s i c t i c t i - 27 -...
Page 30: Installation Instructions
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. "Warning"...
Page 31: Before Installation
INSTALLATION INTÉRIEUR. ANSI Z21.10.3-2004 CSA 4.3-2004 NAT / GPL MODEL : MWH-180 NATURAL GAS (Gaz Naturel) PROPANE GAS (GPL) REFER TO THE LOCAL GAS AUTHORITY FOR CONFIRMATION ON THE GAS TYPE, IF IN DOUBT. DO NOT REMOVE THIS LABEL UNTIL THE APPLIANCE HAS BEEN INSTALLED AND TESTED.
Page 32: Installation Instructions
INSTALLATION INSTRUCTIONS Installation. Caution • Reinforce the wall if necessary as this unit weighs about 43lbs. • Make sure that there is adequate floor drainage to prevent flooding the floor. 1. Twist 1 screw (for wall hanging) into the wall leaving about 1/8" (4mm) length to hook on. 2.
Page 33: Installation Instructions --------------------------------------------------------
• MWH-180 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.
Page 34: Dimensions
24 17/32" (623mm) 24 1/32" 3 5/8" (610mm) (92mm) 4 5/16" 13/32"~1 13/16" (110mm) (10~46mm) 3 13/16" 22 27/32" 2 21/32" (97mm) (580mm) (67mm) 4 1/16" (103mm) 8 9/32" (210mm)
Page 35: Template Of L Termination Installation
TEMPLATE OF L TERMINATION INSTALLATION Thickness (refer to TABLE) Facing plate Holes (refer to TABLE) L termination Facing plate Reducer 6 5/8" (168mm) 3 5/16" (84mm) 1 31/32" (50mm) TABLE : Relationship between the range of wall thickness and the diameter of opening on the wall. Model Number MPI P/N the range of wall thickness...
Page 36: Suggested Piping-Basic Installation
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 37: Suggested Piping-Circulation Systems
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 38: Vent Pipe Installation
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 39: Vent Pipe Installation
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.
Page 40 VENT PIPE INSTALLATION • 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. •...
Page 41 VENT PIPE INSTALLATION Note : • In case D value is longer than 41, the unit shall be relocated with vent length of less than 41'. • In case vent pipe requires extension, use coaxial vent pipe and elbows and start from the vent terminal side.
Page 42: High Altitude
HIGH ALTITUDE • In case of using MWH-180 at elevations 4,500 feet above sea level, configure the settings each gas type in accordnce with following. This settings are different to the page 38 and 39. • In case extension of the vent pipe is required, it shall be limited to the maximum length...
Page 43: Vent Pipe Installation ---------------------------------------------------------------
VENT PIPE 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'.
Page 44 VENT PIPE INSTALLATION General installation requirements. (1) Selecting installation site. • A vent system that exits the structure through a sidewall or the like shall terminate not less than 12" (30.5cm) above the ground. • The termination of the vent system shall be located above the snow line in geographical areas where snow accumulates.
Page 45 VENT PIPE INSTALLATION Straight Length Adjustable Length Rain Cap (MPI P/N 3818) 201.5 Model Number MPI P/N Model Number MPI P/N FFTP300 3801 11.8" (300mm) FFTA200 3804 6.9-9.1" (175-230mm) FFTP600 3802 23.6" (600mm) FFTA260 3805 8.5-12.2" (215-310mm) FFTP900 3803 35.4" (900mm) 90º...
Page 46 VENT PIPE INSTALLATION A vent system and components are the only vent system and components that have been approved by CSA to use with this unit. U.L. Listed vent components of similar dimensions may be used. All the air used for combustion shall be supplied from the outside and all the exhaust gas shall be discharged to the outside.
Page 47 VENT PIPE INSTALLATION (b) Rain cap, air intake pipe, and roof flashing (cap) shall be connected by turning the screw at each end of pipes clockwise as far as they will go, as shown in Fig. 3. When connecting between air intake pipe and roof flashing (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.
Page 48 VENT PIPE INSTALLATION • Adjustable lengths Adjustable lengths are available to allow for installation where fixed-length sections do not produce the desired dimensions. Also adjustable lengths may be used to compensate for linear thermal expansion/contract between two fixed points. As shown in Table1, 2 types of adjustable lengths are available according to the limits in which its effective length can be made longer and shorter.
Page 49 VENT PIPE INSTALLATION (2) Detail of installation. No less than 2º (1/4 in/ft) Male end No less than 2º (1/4 in/ft) L termination Reducer Female end Fig. 4-1 Fig. 4-3 Horizontal installation [FFT-7U(L)] Horizontal extended installation without drain tee No less than 2º (1/4 in/ft) No less than 2º...
Page 50 VENT PIPE INSTALLATION TABLE 2 : Relationship between the range of wall thickness and the diameter of opening on the wall. Model Number MPI P/N the range of wall thickness the diameter of opening 3810 FFT-7U-200 3.9-9.8" (100-250mm) ø5.7-5.9" (ø144-150mm) 3811 (250-450mm) FFT-7U-300...
Page 51 VENT PIPE INSTALLATION End of air intake pipe Stamped letter About 0.2" End of sleeve Sleeve Packing No less than 2º (1/4 in/ft) L termination Plug Reducer 4 Screws Seal between sleeve and wall Horizontal installation [FFT-7U(L)] Seal between inner sleeve pipe and outer pipe Seal between sleeve and wall...
Page 52 VENT PIPE INSTALLATION Maximum vent length Number of 90º elbow Maximum vent length (7.0m) (8.8m) (10.7m) Unless a drain tee is used, the maximum vertical height of the vent system can not exceed 5' (1.5m). Horizontal extended installation (See Fig. 6). The straight termination consists of 2 parts (sleeve and termination itself).
Page 53 VENT PIPE INSTALLATION End of air intake pipe Stamped letter About 0.2" End of sleeve Sleeve Packing No less than 2º (1/4 in/ft) 5' (1.5m) Reducer 90º elbow Plug Support strap 4 Screws Straight length Straight termination Seal between sleeve and wall Horizontal extended installation without drain tee Seal between inner sleeve pipe...
Page 54 VENT PIPE INSTALLATION Vertical installation Vertical installation Rain cap Rain cap Air intake pipe Air intake pipe Roof Roof flashing flashing 90º elbow Straight length No less than 2º (1/4 in/ft) upward Drain tee Drain tee < Fig. 7 Vertical installation > Vertical installation.
Page 55: Vent Pipe Installation ---------------------------------------------------------------
VENT PIPE INSTALLATION Vertical installation (See Fig. 7). 1. Check the location of appliance and the path for the vent system. And calculate the required number and combination of items (see the dimensions of items in Fig.1, page 41) of the vent system.
Page 56: Gas Line Sizing Charts
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 " 2 " 2 " 3 Contact the Gas Supplier for Btu/Cubic Ft. "...
Page 57: Gas Piping
GAS PIPING • Install the manual gas control valve in the gas inlet connection of MWH-180. • 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 58: Pressure Relief Valve
ELECTRICAL CONNECTION Warning 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 the MWH-180 should be in accordance with local codes and the Canadian Electrical Codes, CSA C22.1 Part 1.
Page 59: Electrical Connection
ELECTRICAL CONNECTION • MWH-180 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.
Page 60: Wiring Diagram
WIRING DIAGRAM - 58 -...
Page 61 WIRING DIAGRAM - 59 -...
Page 62: Diagnostic Points
DIAGNOSTIC POINTS e i l Ω Ω Ω Ω e i l e i l Ω l l o e i l e i l o l l µ Ω c t i o l l o l l Ω o l l o l l o l l...
Page 63: Schematic Diagram
SCHEMATIC DIAGRAM Air Supply Duct Exhaust Duct Heat Exchanger Over Heat Switch Frost Sensing Switch Heat Exchanger Thermistor Flame Rod Anti-Frost Heater Thermal Fuse Burner Electrode Air Thermistor Igniter Fan Motor Solenoid Valve SV2 Remote Solenoid Valve SV1 Controller Water Flow Control Device Modulating Solenoid Valve...
Page 64: Wiring Remote Controller
Only one of each type of controllers can be connected to one MWH-180 water heater. (i.e. Installations with two CMR-2250 or two YST-2250 will not function properly.) The remote controllers can be wired in parallel only depending on the distance from MWH-180 to the remote controllers.
Page 65: Main Remote Controller Cmr-2250 (P/N 3748)
MAIN REMOTE CONTROLLER CMR-2250 (P/N 3748) 1) Safety precautions on Main remote controller installation. • Connect remote controller cable after heater is unplugged. Bad examples • Never install Main remote controller above a combustion appliance like hot plate or a kitchen range. The heat will cause electrical component problems, or deform Chemicals Do Not...
Page 66: Bath Remote Controller Yst-2250 (P/N 3749)
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 67: Testing Operation
TESTING OPERATION • Follow the steps below, to ensure the MWH-180 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.
Page 68: Instructions For Conversion
INSTRUCTIONS FOR CONVERSION Instructions for converting the MWH180 from nat. gas to LP gas or LP gas to nat. gas. DANGER: Serious injury or death can result to individuals who are not licensed professionals properly trained in performing conversions. Proper tools and safety gear are always required. If you are not a professional trained in conversions do not attempt to perform a conversion.
Page 69 INSTRUCTIONS FOR CONVERSION Procedure Illustration Step 2: Damper setscrew (2 pcs) Damper setscrew (2 pcs) (1) Remove set screws (2pcs) fixing the Damper and pull the Damper out downward. (2) Replace Damper with appropriate one stamped LP or Nat. L P G Gas type engraved mark N A T Gas type engraved mark...
Page 70 INSTRUCTIONS FOR CONVERSION Step 5: Gas Pressure Checking and Setting Procedure 1. Preparation (1) It is assumed that the inlet gas pressure coming into the unit is within the min. to max. allowed, as per the Data Rating Plate, for gas type to be used. The gas inlet pressure can be checked at the threaded hose fitting of the 3/4 inch inlet gas connection to the unit by: •...
Page 71 INSTRUCTIONS FOR CONVERSION (3) With the unit still running, set "DIP Switch" No. 6 to ON position to set the combustion at a maximum capacity level. At this time, a substantial amount of water should be supplied. "Multiple faucets should be opened to prevent water from boiling, as the maximum capacity is forced, if the water temperature is high, the heated water may reach its boiling point."...
Page 72: Warranty
Inc. (MPI) will repair or replace the heat exchanger at MPI's sole discretion. If the MWH-180 is used in other than a single family dwelling, or if the MWH-180 is supplied with pre-heated or circulated water, then the heat exchanger warranty shall be limited to three (3) years and all other parts are limited to two (2) years.
Page 73 (in no event later than thirty (30) days after discovery of the defect) notify the selling dealer authorized to service the MWH-180, or MPI at 732-329-0900 for the name of a local servicing dealer. All claims must be accompanied by a proof of purchase: sales receipt, cancelled check, or a warranty registration card mailed to MPI within 30 days of purchase.