Table of Contents
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Table of Contents
Troubleshooting
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Summary of Contents for Rheem RUUD Iraining
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Page 2: Table Of Contents
Heat Pump Water Heater Table of Contents ..........................3 NTRODUCTION ............................3 AFETY Electrical ............................. 3 R410a Refrigerant ........................3 Scalding............................3 Flammable Vapors ........................3 ............4 OMPONENT ARTS OF THE ATER EATER ............................ - Page 3 Should you have any problems reading or following the instructions in the Use and Care Manual, seek the help of a licensed and qualified professional. Copyright 2009, Rheem Manufacturing Company, Water Heater Division.
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Page 4: Introduction
This is a training manual not a job site service manual nor a parts manual. The intent of this manual is to train users of the Heat Pump Water Heater manufactured by Rheem. This manual does not assume any particular user liability, skill level, experience or expertise. The terms and component parts used in this manual are current manufactured items or vendor provided items used in Rheem Heat Pump Water Heater. -
Page 5: Component Parts Of The Heat Pump Water Heater
Heat Pump Water Heater Component Parts of the Heat Pump Water Heater Figure 1- HPWH Service Parts Part Name Description Picture This panel allows for user selection of water temperature and operating mode. User control (14) - Page 6 Heat Pump Water Heater A heat pump is a device for transferring energy in the form of useful heat from one place to another. It cannot store, make or destroy heat energy – it simply moves it. It works like Heat Pump your refrigerator;...
- Page 7 Heat Pump Water Heater 240V, 1 phase, 60 Hz Taco, Inc. 1/40 HP; 3250 RPM 125 PSI max Water pump When heating water, the pump cycles the cooler water from the bottom of the tank and through the heat exchanger to maximize heating and efficiency.
- Page 8 Heat Pump Water Heater A heat pump capacitor is used to give the compressor motor an electrical "boost" when a working load is placed on the unit. It makes the unit easier to Capacitor start. (12) Relays allow power to be transferred to another location or part.
- Page 9 Heat Pump Water Heater Therm-o-disc 10,000 ohms thermistor Measures the temperature of the Evaporator evaporator gasses. Thermistor (16) Therm-o-disc 10,000 ohms thermistor Measures the temperature of the discharge gasses. Discharge Thermistor (17) This thermister is difficult to see. It is on top of the compressor.
- Page 10 Heat Pump Water Heater Valves use to charge and check the pressure in the heat pump. These valves are not normal Charging and service ports and require special pressure check valves HVAC licensing and refrigerant collection equipment. (not serviceable) Fujikoki Corp. Valve that is part of the refrigerant system.
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Page 11: Tools
Heat Pump Water Heater This LED will blink when there is a problem with the water heater. Error Code LED Light The circuit board controls all the electrical and temperature sensing inputs for the heat pump water heater. Connections only go one way and are unique Circuit Board to each connection port. -
Page 12: Operational Modes
Heat Pump Water Heater Operational Modes E n e r g y S a v e r M o d e This mode will provide functional control operation resulting in water heater performance that meets Energy Star requirements; FHR (First Hour Rating) – exceeding the minimum of 50 GPH (Gallons per Hour) with 62 GPH and a minimum EF (Energy Factor) of 2.0. -
Page 13: Water Pump Flow Rates
Heat Pump Water Heater Water Pump Flow Rates Water pump operation will be allowed whenever the compressor or electric heat is operational. The basic water pump motor will be a single speed 240 volt AC motor. Water pump speed will be controlled via the control board based on Triac motor voltage control. -
Page 14: Sequence Of Operations
Heat Pump Water Heater Sequence of Operations E n e r g y S a v e r M o d e Under no circumstances will the compressor and lower electric heating element be allowed to operate at the same time. Start Sequence 1. -
Page 15: Normal Mode
Heat Pump Water Heater Normal Mode Under no circumstances will the compressor and lower electric heating element be allowed to operate at the same time. Start Sequence 1. If lower tank thermostat is less than 70ºF and upper tank thermostat is less than 75ºF, the water pump and both elements are energized until lower tank thermostat is 80ºF. -
Page 16: Electrical Heat Only Mode
Heat Pump Water Heater E l e c t r i c a l H e a t O n l y M o d e This operational sequence is the same as the sequence for the Energy Saver and Normal Modes except: 1.Compressor operation is not allowed. -
Page 17: Safety Functions Of The Controls
Heat Pump Water Heater Safety Functions of the Controls E C O ( E n e r g y C u t O f f ) The ECO switch functions as a high limit switch responsive when the water temperature approaches 170° F. If the water temperature inside the tank reaches 170°... -
Page 18: Troubleshooting The Heat Pump Components
Heat Pump Water Heater T r o u b l e s h o o t i n g t h e H e a t P u m p C o m p o n e n t s Trouble Probable Cause Remedy... -
Page 19: Troubleshooting Component Parts
Heat Pump Water Heater Troubleshooting Component Parts U p p e r o r L o w e r H e a t i n g E l e m e n t s How to check for an open element An open element is a condition where the nichrome filament wire is broken somewhere on the inside of the heating element and you cannot tell by a visual inspection. -
Page 20: Thermistors (Ambient, Suction, Discharge, Water Out, Evaporator, Upper Tank And Lower Tank)
Heat Pump Water Heater T h e r m i s t o r s ( a m b i e n t , s u c t i o n , d i s c h a r g e , w a t e r o u t , e v a p o r a t o r , u p p e r t a n k a n d l o w e r t a n k ) There are seven (7) thermistors on the HPWH. -
Page 21: Circuit Board
Heat Pump Water Heater C i r c u i t B o a r d The circuit board may become damaged. IF the board has power, then the board must work. In the event nothing happens when you attempt to turn on the HPWH, then check in sequence: •... -
Page 22: Disassembly And Repair
U p p e r o r L o w e r H e a t i n g E l e m e n t s Heating elements in Rheem HPWH are screw in immersion type equipped with a one inch threaded pug. -
Page 23: Capacitor
Heat Pump Water Heater C a p a c i t o r 1. Turn off power to the water heater. 2. Using a flat blade and insulated screwdriver ground either the red or purple terminal to the water heater to discharge any residual power in the capacitor. 3. -
Page 24: Fan Assembly
Heat Pump Water Heater F a n A s s e m b l y 1. Turn off power to the water heater and remove the fan filter. 2. Using a flat blade screwdriver or ¼ inch nut driver, remove the screws holding the fan cover. -
Page 25: Figure 17- Replace Circuit Board
Heat Pump Water Heater 5. Disconnect all the Molex connections to the circuit board. The Molex connections only go one way and to its respective receiver. If you are in doubt, label the wires (or write on the Molex) as you remove them with the connector number from the board. This is especially important for the thermistors. -
Page 26: Wiring Connection Diagram
Heat Pump Water Heater Wiring Connection Diagram Figure 18– Wiring Diagram... -
Page 27: Temperature To Resistance Thermistor Chart
Heat Pump Water Heater Temperature to Resistance Thermistor Chart Cº Fº Resistance Cº Fº Resistance Cº Fº Resistance 32,654 7,096 1,943 34,367 6,806 1,876 32,654 6,530 1,813 31,030 6,266 1,752 29,498 6,014 1,693 28,052 5,774 1,637 26,686 5,546 1,582 25,396 5,327 1,530 24,171... - Page 28 Heat Pump Water Heater N O T E S ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________...
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