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COMMERCIAL ELECTRIC AIR-TO-WATER HEAT PUMP WATER HEATER
820 SW 41st Street
Renton, WA 98057
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
PLACE THESE INSTRUCTIONS ADJACENT TO HEAT PUMP AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
PRINTED 0114
Instruction Manual
MODELS AWH-35 to AWH-170
INSTALLATION - OPERATION - SERVICE
MAINTENANCE - LIMITED WARRANTY
FOR INDOOR INSTALLATION ONLY
SERIES 100
318653-000
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Summary of Contents for A.O. Smith AWH-35
- Page 1 Instruction Manual COMMERCIAL ELECTRIC AIR-TO-WATER HEAT PUMP WATER HEATER MODELS AWH-35 to AWH-170 SERIES 100 INSTALLATION - OPERATION - SERVICE 820 SW 41st Street MAINTENANCE - LIMITED WARRANTY Renton, WA 98057 FOR INDOOR INSTALLATION ONLY Read and understand this instruction...
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Page 3: Table Of Contents
TABLE OF CONTENTS TABLE OF CONTENTS ................3 INSTALLATION ..................16 SAFE INSTALLATION, USE AND SERVICE.......... 4 Required Tools and Materials ............16 GENERAL SAFETY INFORMATION ............5 Installation & Start Up Tools ............16 Precautions ..................5 Service Tools ................16 Grounding Instructions .............. -
Page 4: Safe Installation, Use And Service
SAFE INSTALLATION, USE AND SERVICE The proper installation, use and servicing of this commercial heat pump water heater is extremely important to your safety and the safety of others. Many safety-related messages and instructions have been provided in this manual and on your own heat pump water heater to warn you and others of a potential injury hazard. -
Page 5: General Safety Information
GENERAL SAFETY INFORMATION PRECAUTIONS GROUNDING INSTRUCTIONS DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN This heat pump water heater must be grounded in accordance UNDER WATER. Immediately call a qualified service agency to with the National Electrical Code and/or local codes. These must inspect the appliance and to make a determination on what steps be followed in all cases. -
Page 6: Introduction
INTRODUCTION Thank You for purchasing this heat pump water heater. Properly Detailed installation diagrams are in this manual. These installed and maintained, it should give you years of trouble free diagrams will serve to provide the installer with a reference service. -
Page 7: Principle Of Operation
AIR TEMPERATURE RANGE 8. Ensure the power supply voltage and phase at the job site matches the power requirements on the HPWH rating label The entering air temperature operating range for the HPWH is before installation begins. Energizing the HPWH with the 50°F to 95°F (10°C to 35°C). -
Page 8: Features And Components
FEATURES AND COMPONENTS PRODUCT ILLUSTRATIONS ACCUMULATOR THERMOSTATIC EXPANSION VALVE (TXV) COMPRESSOR EVAPORATOR COIL (HEAT EXCHANGER) (AIR TO REFRIGERANT) CONTROL PANEL BLOWER MOTOR RETURN AIR INLET WATER (AIR FILTERS) PUMP CONDENSER CONDENSATE (HEAT EXCHANGER) DRAIN (REFRIGERANT TO WATER) BLOWER SUPPLY AIR OUTLET WARM RETURN AIR IN... -
Page 9: Rough In Dimensions
** Blower design at 0.35” external static pressure. C. O. P. = Coefficient Of Performance All models standard 208/230 VAC, 3Ø, 60 Hz Optional 460 VAC, 3Ø, 60 Hz Optional 208/230 VAC, 1Ø, 60 Hz available on AWH-35 and AWH-55 only... -
Page 10: Installation Requirements
INSTALLATION REQUIREMENTS Read all installation requirements in this manual before installation Contact your local distributor or call the technical support begins. The installation must conform to these instructions and phone number listed on the back cover of this manual for more all local and national code authority having jurisdiction. -
Page 11: Unconditioned Space
-10% of the voltage requirement listed on the HPWH rating label for satisfactory operation. VOLTAGE & AMPERAGE RATINGS Figure 3 TABLE 2 COMPRESSOR BLOWER MOTOR PUMP (230 VAC 1Ø)* MODEL VOLTS/PHASE/HZ AWH-35 208-230/1/60 18.60 100.00 29.00 3.60 0.88 AWH-35 208-230/3/60 10.90 77.00... -
Page 12: Minimum Circuit Ampacity & Maximum Fuse Size
MINIMUM CIRCUIT AMPACITY & MAXIMUM FUSE SIZE Table 2 on page 11 provides the MCA (Minimum Circuit Ampacity) and MFS (Maximum Fuse Size). Use MCA to select the minimum field wires size to power the unit and MFS to select the maximum fuse size for over current protection as follows: Electrical Shock Hazard •... -
Page 13: Water Piping
WATER CONNECTIONS AND FLOW Children, the elderly and the UNIT CONNECTION SIZE (INCH) physically or mentally disabled are at AWH-35 highest risk for scald injury. AWH-55 Feel water before bathing or AWH-75 showering. AWH-100... -
Page 14: Condensate Removal
TABLE 5 connected to the storage tank. If more than one water heating appliance is connected to the storage tank the aggregate total Time to Produce 2nd & 3rd Water Temperature of all heating input ratings of all connected appliances must be Degree Burns on Adult Skin factored when choosing a T&P valve for the storage tank. -
Page 15: Storage & Handling
Potentially harmful fumes and vapors could be introduced into occupied spaces. See Unit Placement on page 16. STORAGE & HANDLING SPREADER HEAVY OBJECT! All Heat Pump Water Heaters (HPWHs) covered by this manual are beyond the safe lifting weight for one person. Use SIDE proper conveyance equipment to move the unit for storage or during installation. -
Page 16: Installation
INSTALLATION REQUIRED ABILITY UNIT PLACEMENT Installation and service of the HPWH unit requires ability Whether replacing existing water heating equipment or installing equivalent to that of a qualified agency in the field involved. the HPWH in new construction, the following critical points must Plumbing, ducting and electrical work are required. -
Page 17: Electrical Connections
ELECTRICAL CONNECTIONS voltage is above 215 VAC no changes are necessary. If the measured voltage is 215 VAC or less, then the primary CAUTION leads of the transformer must be changed from the 230 VAC tap to the 208 VAC tap. Do this by disconnecting the orange wire CORRECT POWER SUPPLY! from the transformer primary terminal and replacing with the red wire. -
Page 18: Single Tank Configuration
15. All components in the hot water supply system must be Purge Valve or T&P adequately sized to meet peak water flow requirement (purge air from system) 16. When the HPWH unit is installed above the storage tank install a Tee fitting at a high point in the outlet water line leaving the unit. -
Page 19: Digital Tank Thermostat Installation
DIGITAL TANK THERMOSTAT INSTALLATION AIR FLOW AND DUCTING GENERAL GUIDELINES 1. Mount the thermostat on the storage tank jacket when or at a suitable location close to the storage tank, see Figure 10. Review Locating The Water Heater on page 10, and this 2. -
Page 20: When To Install Ducting
Negative Pressure to 11°C) as it flows through the HPWH unit. If the return air to the HPWH unit is derived from a location that is above Ducting supply air only to an alternate location, such as the 80°F (27°C) the supply air from the HPWH unit will not be outdoors, may cause excessive negative air pressure inside the suitable for offsetting the building cooling load. - Page 21 TABLE 6 METAL DUCT DUCT SIZE (INCHES) MODEL EXT (in WG) MAXIMUM EQUIVALENT LENGTH (FEET) AWH-35 1040 0.35 AWH-55 1650 0.35 AWH-75 2150 0.35 AWH-100 3200 0.35 AWH-115 3200 0.35 AWH-140 3800 0.35 AWH-170 4900 0.35 ELBOW SIZE (IN) EQUIVALENT FEET ONE 90°...
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Page 22: Installation Checklist
INSTALLATION CHECKLIST The list below represents some of the most critical installation water supply is not connected to the back up water heater. requirements that, when overlooked, often result in operational 15. Connect building recirculation loop piping to the backup problems, down time and needless parts replacement. -
Page 23: Start Up
START UP This start-up refers to several tools and test instruments needed flow is decreased the temperature rise will increase and as to complete the procedure. See Required Tools and Materials on water flow is increased the temperature rise will decrease. page 16. -
Page 24: Digital Tank Thermostat
DIGITAL TANK THERMOSTAT DISPLAY BUTTON OUTPUT BUTTON DOWN BUTTON FACTORY SUPPLIED DIGITAL TANK THERMOSTAT - MODEL MT511Ri Figure 11 OPERATION Note: the factory for operating mode is [ Hot ] and should not be changed. When the water temperature in the storage tank as sensed by the Digital Tank Thermostat’s temperature sensor reaches the TEMPERATURE UNITS SETTING (°F/°C) Tank Temperature Set Point the thermostat will end the heating... -
Page 25: Maintenance And Service
MAINTENANCE AND SERVICE ROUTINE MAINTENANCE Inspect and tighten all bearing collar and wheel set screws after the first 50 to 200 hours of operation and there after, at least Warning: When possible, disconnect all power to the unit and every six months. During inspection, visually check the drive belt follow the prescribed lock - out/tag - out procedure to prevent for wear or cracking. - Page 26 CLEANING INTERNAL INSULATION BRAZE PLATE CLEANING INSTRUCTIONS In some applications the heat exchanger may be subjected to Inspect the internal insulation on a yearly basis for any microbial severe fluid conditions, including high temperture hard water growth. The insulation never has to be cleaned unless microbial conditions, causing accelerated scaling and corrosion rates, and growth is detected.
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Page 27: Troubleshooting
TROUBLESHOOTING PROBLEM POSSIBLE CAUSES CORRECTIONS 1. Sheet metal fasteners are loose. Tighten fasteners. 2. Operating vibration transferring floor Heat pump is too noisy. Place vibration dampeners underneath unit. building structure. Tighten or align pulleys. 3. 3. Blower pulley assembly loose or out of alignment. 1. -
Page 28: Checking Refrigerant Charge
MODEL FACTORY CHARGE R134A rating label on the HPWH unit and Table 9 for refrigerant charge AWH-35 2lbs, 15oz by weight. It should not be necessary to add or remove refrigerant during installation or start up. Refrigerant lost during frequent... -
Page 29: Control System
Normally Closed - Open On Rise Contacts Close Contacts Open Contacts Close Contacts Open AWH-35 - AWH-170 35 PSI (241 kPa) ± 5% 15 PSI (103 kPa) ± 5% 250 PSI (1,724 kPa) ± 15% 350 PSI (2,413 kPa) ± 15%... -
Page 30: Phase Monitor
PHASE MONITOR Some of the higher capacity models are equipped with Phase Monitor and Compressor Overload modules that interface with the Control Board. See Table 12 on page 31. • If all 3 phases of power are present and in sequence, the normally open contacts (Y/Y-OUT) will close when 24 volts is applied between C and Y terminals. -
Page 31: Wiring Diagrams
TABLE 12 MODEL PHASE COMPRESSOR MONITOR OVERLOAD MODULE AWH-35 AWH-55 AWH-75 AWH-100 AWH-115 AWH-140 AWH-170 Abbreviations are used in the wiring diagrams in this section. Table 13 defines the wiring diagram abbreviations used in this section and on the wiring diagrams affixed to the HPWH units. -
Page 37: Thermostat And Accessory Wiring Diagrams
THERMOSTAT AND ACCESSORY WIRING DIAGRAMS DIGITAL TANK THERMOSTAT WIRING This Ambient Air Limit Thermostat temporarily disables compressor operation when the return (entering) air temperature is above or below the normal operating temperature range. The return (entering) air temperature operating range for the HPWH is 50°F to 95°F (10°C to 35°C). -
Page 38: Standard Tank Thermostat Wiring
STANDARD TANK THERMOSTAT WIRING FIELD SUPPLIED STANDARD TANK THERMOSTAT NOTE: TANK TEMPERATURE SETTING MUST NOT EXCEED 140°F (60°C) HPWH TERMINAL STRIP (24 VAC HOT) AMBIENT AIR (24 VAC COM) LIMIT THERMOSTAT REMOTE AIR RANCO DIGITAL THERMOSTAT PART # ETC 212000-000 TEMPERATURE SENSOR AMBIENT AIR LIMIT THERMOSTAT... -
Page 39: High Ambient Air Kit Wiring
HIGH AMBIENT AIR KIT WIRING Note: To purchase High Ambient Air Kit contact your sales representative, distributor or call the toll free technical support number on the back cover of this manual for further assistance. See Table 14 on page 40 for the part number needed. DIGITAL TANK THERMOSTAT FULL GAUGE - MODEL MT511Ri NOTE:... -
Page 40: Building Recirculation Pump Wiring Diagram
HIGH AMBIENT AIR KITS TABLE 14 AWH-35 9500012730 AWH-55 9500012731 AWH-75 9500012732 AWH-100 9500012733 AWH-115 AWH-140 9500012734 AWH-170 9500012735 THERMOSTAT AND ACCESSORY WIRING DIAGRAMS BUILDING RECIRCULATION PUMP WIRING DIAGRAM CIRCULATING PUMP WIRING DIAGRAM FOR BUILDING RECIRCULATION TO STORAGE TANK FIELD SUPPLIED LINE TEMPERATURE CONTROL... -
Page 46: Limited Warranty
LIMITED WARRANTY MODELS AWH, WH, WW, CPH COMMERCIAL HEAT PUMP WATER HEATERS A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this commercial heat pump water heater subject to the terms, conditions and disclaimers stated below: 1. - Page 47 Fill in the following for your own reference. Keep it. Registration is not a condition of warranty. The model and serial number are found on the heater’s rating label. Model No. Serial No. Date Installed Dealer’s Name Dealer’s Address Phone No. City and State...
- Page 48 500 Tennessee Waltz Parkway, Ashland City, TN 37015 Technical Support: 800-527-1953 • Parts: 800-433-2545 • Fax: 800-644-9306 www.hotwater.com...
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