Univex 318258-000, EPX-80DHPT User Manual

State – Premier

Hybrid Electric

Heat Pump Water Heater

Installation Instructions and Use & Care Guide

To obtain technical, warranty or service assistance during or after the installation of this water heater, call toll free

1-800-365-0024

When calling for assistance, please have the following information ready:

1. Model number

2. 7 Digit product number

3. Serial number

4. Date of installation

5. Place of Purchase

Table of Contents Page

Water Heater Safety ............................................................................... 2

Installing Your Water Heater .................................................................3-9

Consumer Information ................................................................ 3

Consumer Responsibilities ......................................................... 3

Unpacking Instructions ............................................................3-4

Location Requirements ............................................................... 4

Water System Piping ................................................................ 5-6

Temperature & Pressure Relief Valve .......................................7-8

Electrical Requirements ...........................................................8-9

Installation Checklist .............................................................................. 10

Operating Your Water Heater ........................................................... 11-13

Before Using ............................................................................. 11

Water Temperature Regulation ................................................. 11

Adjusting the User Interface Module/ Operational Mode .......... 12

Operational Conditions ............................................................. 13

Maintenance of Your Water Heater ..................................................14-15

Temperature and Pressure Relief Valve .................................... 14

Draining and Flushing ................................................................ 14

Heating Element Replacement ............................................. 14-15

Cleaning the Heat Pump ........................................................... 15

Diagnostic Codes ..................................................................................16

Troubleshooting Chart ........................................................................... 17

Repair Parts Illustration ......................................................................... 18

Notes... .............................................................................................. 19-20

318258-000

February 2010

WATER HEATER SAFETY

Your safety and the safety of others are very important.

We have provided many important safety messages in this manual and on your appliance. Always read and obey all safety messages.

This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others. All safety messages will follow the safety alert symbol and either the word “DANGER” or “WARNING.” These words mean:

You can be killed or seriously injured if you don’t immediately follow instructions.

You can be killed or seriously injured if you don’t follow instructions.

All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you what can happen if the instructions are not followed.

Important Safety Instructions

CAUTION: Hydrogen gas is produced in a hot water system served by this heater that has not been used for a long

period of time (2 weeks or more). Hydrogen gas is extremely ﬂ ammable. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. When hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to ﬂ ow. There should be no smoking or open ﬂ ame near the faucet at the time it is open.

The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of potential exposure to such substances.

WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.

This appliance can cause low-level exposure to some of the substances included in the Act.

IMPORTANT: The heat pump portion of this water heater uses R-134a refrigerant. See the data plate on the heat pump

compressor for charge level.

INSTALLING YOUR WATER HEATER

Consumer Information

This water heater should be installed in accordance with the local code authority having jurisdiction, the power company or electric utility, and this installation manual. In the absence of local code requirements, follow the regulations set forth in the latest edition of The National Electric Code, NFPA 70. This is available from the following:

National Fire Protection Association 1 Batterymarch Park Quincy, MA 02269

American National Standards Institute 1430 Broadway New York, NY 10018

Check your phone listings for the local authorities having jurisdiction over your installation.

Consumer Responsibilities

This manual has been prepared to acquaint you with the installation, operation and maintenance of your electric heat pump water heater and to provide important safety information in these areas.

We urge you to read all of the instructions thoroughly before attempting the installation or operation of this water heater. This manual should be kept for future reference.

The manufacturer of this water heater will not be liable for any damages caused by failure to comply with the installation and operating instructions outlined in this manual.

If you lack the necessary skills required to properly install this water heater or you have difﬁ culty following the directions, you should not proceed but have a qualiﬁ ed person perform the installation of this water heater.

Examples of a qualified person include: licensed plumbers, authorized electric company personnel, and authorized service personnel.

Massachusetts code requires this water heater to be installed in accordance with Massachusetts 248-CMR 2.00: State Plumbing Code and 248-CMR 5.00.

A data plate identifying your water heater can be found adjacent to the upper element door. When referring to your water heater always have the information listed on the data plate readily available, to include the model and serial number.

Retain your original receipt as proof of purchase.

the water while the electric elements only function during high demand periods. (See “Adjusting the User Interface Module/ Operational Mode” section). The more often the unit operates using the heat pump, rather than the elements, the more efﬁ cient the unit will be.

The 80-gallon tank capacity of this water heater is intended to take optimal advantage of the heat pump’s capability to heat water for large families or those having higher than normal hot water requirements. This high capacity will enable the unit to operate in the maximum efﬁ ciency mode more often than other models having lower capacity.

The HPWH uses about half the electricity of a comparably sized conventional electric water heater when operating in the Efﬁ ciency Mode, and provides up to ½ ton cooling capacity and dehumidiﬁ cation. It is designed for indoor, residential applications for installation in a basement, garage or utility room (See “Location Requirements” section).

Figure 1 Heat Pump Water Heater Basic Operation

Ambient Air

Heat Pump

(Transfers heat

from ambient

air to Heat Exchanger)

Upper Element

(4500 Watt)

Lower Element

(2000 Watt)

Unpacking the Water Heater

WARNING

Excessive Weight Hazard

Cool/Dehumidified Air

Water Tank

Jacket

Heat Exchanger (Heat Transfer Coils)

Basic Operation Fundamentals

The Heat Pump Water Heater (HPWH) is an integrated heat pump water heater unit, having an 850 watt compressor and external coil heat exchanger with backup electric elements (See Figure 1). When in Efﬁ ciency Mode the heat pump draws heat from the ambient air in the room and transfers it to the water in the tank through the coil heat exchanger. While in Electric Mode the water heater functions like a standard electric water heater, relying on the electric elements to heat the water. A Hybrid Mode is available that relies primarily on the heat pump to heat

Use two or more people to move and install water heater.

Failure to do so can result in back or other injury.

Removing Packaging Materials

IMPORTANT: Do not remove, cover or deface any

permanent instructions, labels, or the data label from either the outside of the water heater or on the inside of water heater panels.

The water heater must NOT be placed on its side. It • should be transported and stored in an upright position. Remove exterior packaging and place installation • components aside. Inspect all parts for damage prior to installation and • start-up. Completely read all instructions before attempting to • assemble and install this product. After installation, dispose of/recycle all packaging • materials.

Location Requirements

Site location

Select a location near the center of the water piping system. The unit must be installed indoors and in a vertical position on a level surface. The ﬂ ooring beneath the water heater must be able to support the weight of the water heater when ﬁ lled with water (967 lbs. full).

IMPORTANT: The water heater must be located in a space

750 cubic feet or larger, and must have unrestricted airﬂ ow. As an example, a room that has an 8 foot tall ceiling and is 10 feet long by 9-1/2 feet wide would contain 760 cubic feet.

NOTE: For optimal efﬁ ciency and serviceability, the

following clearances should be maintained: 3 feet on the air inlet side, 5 feet. on the air outlet side, 6 inches in the back, and 2 feet in the front.

The water heater should be located in an area not subject to freezing temperatures. Water heaters located in unconditioned spaces (i.e., garages, basements, etc.) may require the water piping, condensate piping, and drain piping to be insulated to shelter against freezing. The drain and controls must be easily accessible for operation and service.

The site location must be free from any corrosive elements in the atmosphere such as sulfur, ﬂ uorine, and chlorine. These elements are found in aerosol sprays, detergents, bleaches, cleaning solvents, air fresheners, paint, and varnish removers, refrigerants, and many other commercial and household products. In addition, excessive dust and lint may affect the operation of the unit (See “Cleaning the Filter” section).

The ambient air temperature must also be considered when installing this unit. In Efﬁ ciency Mode the ambient air temperature must be above 45°F and below 109°F. If the ambient air temperature falls outside these upper and lower limits the electrical elements will activate to meet the hot water demand and the heat pump does not operate.

IMPORTANT: The water heater should be located in an

area where leakage of the tank, connections, condensate lines or condensate will not result in damage to the area adjacent to the water heater or to lower floors of the structure. Due to the normal corrosive action of the water, the tank will eventually leak after an extended period of time. Also, any external plumbing leak, including those from improper installation, may cause early failure of the tank due to corrosion if not repaired. If the homeowner is uncomfortable with making the repair a qualified person should be contacted. A suitable metal drain pan should be installed under the water heater as shown below, to help protect the property from damage which may occur from condensate formation or leaks in the piping connections or tank.

The pan must limit the water level to a maximum depth of 2-1/2 inches and be two inches wider than the heater and piped to an adequate drain. Locate the water

heater near a suitable indoor drain. Outside drains are subject to freezing temperatures which can obstruct the drain line. The piping should be at least 3/4” ID and sloped for proper drainage. Under no circumstance will the manufacturer or seller of this water heater be held liable for any water damage which is caused by your failure to follow these instructions.

Figure 2 Metal Drain Pan Installation

METAL DRAIN PAN

AT LEAST 2” GREATER THAN THE DIAMETER OF THE WATER HEATER.

PIPED TO AN ADEQUATE DRAIN

NOTE: The water heater shall be located so it is not subject

to physical damage by moving vehicles or area ﬂ ooding.

Figure 3 Residential Garage Installation

Vehicle Stop

NOTE: Local codes and requirements in your area may

require the installation of your water heater be accomplished in a way that the bottom element is elevated from the ﬂ oor at least 18 inches. Ensure that a platform capable of supporting the combined weight of the water heater and water (967-pounds) is used.

Drain Pan

Drain

State of California NOTE: The water heater must be braced, anchored, or

strapped to avoid moving during an earthquake. Contact local utilities for code requirements in your area, visit http://www.dsa.dgs.ca.gov, or call 1-916-445-8100 and request instructions.

Water System Piping

Piping, ﬁ ttings, and valves should be installed according to the installation drawing (Figure 4). If the indoor installation area is subject to freezing temperatures, the water piping must be properly insulated.

Water supply pressure should be 50-60 PSIG and not exceed the maximum 80 PSIG. If the supply line pressure exceeds 80 PSIG, a pressure reducing valve (PRV) with a bypass should be installed in the cold water supply line. This should be placed on the supply to the entire house in order to maintain equal hot and cold water pressures.

IMPORTANT:

•

Heat must not be applied to the water fittings on the heater as they may contain nonmetallic parts. If solder connections are used, solder the pipe to the adapter before attaching the adapter to the hot and cold water fittings.

• Always use a good grade of joint compound and be certain that all fittings are tight.

IMPORTANT: DO NOT over apply joint compound.

Piping Installation

Install the water piping and fittings as shown in Figure 1.

4. Connect the cold water supply (3/4” NPT) to the fitting marked “Cold”. Connect the hot water supply (3/4” NPT) to the fitting marked “Hot”. The installation of unions in both the hot and cold 2. water supply lines are recommended for ease of removing the water heater for service or replacement.

Figure 4 Water Piping Installation with Mixing Valve

Temperature and Pressure Relief Valve

Discharge Pipe (Do Not Cap or Plug)

Heat Trap - The top of the heat trap must be higher than the storage tank of the water heater.

Union

Shut-off Valve (Hot)

Hot

(Outlet)

Mixing Valve (Optional) - Follow the Mixing Valve’s Manufacturer’s Installation Instructions. (Set to 120° F)

Condensate Drain Lines*

Some local codes may require, and the manufacturer 3. of this water heater recommends, installing a mixing valve or an anti-scald device in the domestic hot water line as shown in Figure 4. These valves reduce the point-of-use temperature of the hot water by mixing cold and hot water and are readily available. Contact a licensed plumber or the local plumbing authority for more information. Some local codes may require, and the manufacturer 4. of this water heater recommends, installing a pressure reducing valve (PRV) in the cold water inlet line where it enters the residence as shown in Figure 4. If installing the water heater in a closed water system, 5. install an expansion tank in the cold water line as specified under “Closed System/Thermal Expansion.” Install a shut off valve in the cold water inlet line. It 6. should be located close to the water heater and be easily accessible. Know the location of this valve and how to shut off the water to the heater. Install a discharge line from the temperature and 7. pressure relief valve in the opening marked “T & P RELIEF VALVE”. See Figure 5 and the “Temperature and Pressure Relief Valve” section.)

After piping has been properly connected to the water 8. heater, open the nearest hot water faucet. Then open the cold water shut off valve and allow the tank to completely fill with water. To purge the lines of any excess air and sediment, keep the hot water faucet open for 3 minutes after a constant flow of water is obtained. Close the faucet and check all connections

for leaks.

Union

Untempered Water Outlet

Tempered Water to Fixtures

Massachusetts: Install a vacuum relief in cold water line per section 19 MGL 142.

Vacuum Relief Valve

Cold Water Inlet Valve

Cold Water Inlet

Whole House Pressure Reducing Valve (PRV) should be installed where the water supply enters the residence.

Cold Water Outlet

Metal Drain Pan 2 1/2” Depth Maximum and 2 Inches wider than the water heater.

Drain Line 3/4” ID Minimum

* If an adequate drain is not available for the condensate drain lines then a condensate pump should be used. DO NOT discharge the condensate drain lines into the metal drain pan.

Cold

(Inlet)

Drain

Shut-off Valve (Cold)

6” Maximum Air Gap

In a closed system, use a thermal expansion tank. See “Closed System/ Thermal Expansion” section.

Please note the following:

• The system should be installed only with piping that is suitable for potable (drinkable) water such as copper, CPVC, or polybutylene. This water heater must not be installed using iron piping or PVC water piping.

• Use only pumps, valves, or fittings that are compatible with potable water.

• Use only full flow ball or gate valves. The use of valves that may cause excessive restriction to water flow is not recommended.

• Use only 95/5 tin-antimony or other equivalent solder. Any lead based solder must not be used.

• Piping that has been treated with chromates, boiler seal, or other chemicals must not be used.

• Chemicals that may contaminate the potable water supply must not be added to the piping system.

Condensate Drain Line Installation

Install two 1/2” PVC discharge lines from the condensate drains (located on the right side near the back). The lines should terminate a maximum of six inches above an adequate drain. Do not discharge the condensate drain lines into the metal drain pan. If no floor drain is available or the drain is above the level of the condensate line, a condensate pump should be installed. These pumps are available from local distributors.

When installing the drain line, note the following:

Plastic pipe or tubing must be used to connect the • condensate drain to a suitable drain or condensate pump.

Condensate drain lines should be installed in • conditioned areas only. Install approved insulation on the condensate drain lines to prevent condensation from forming on the outside of the drain lines. Condensation drain lines installed in areas that are subject to freezing temperatures should be wrapped with a nationally recognized/listed heat tape. Install per manufacturer’s instructions.

Do not connect condensate drain lines with other drain • or discharge lines into a single (common) pipe or line. Each line (condensate drain line, temperature and pressure relief valve discharge pipe, etc) should be independently run to an adequate drain.

Slope the condensate drain lines toward the inside • floor drain or condensate pump.

The condensate drain lines and connections to the • drain piping must comply with all local codes.

Use appropriate primer and glue to cement the • condensate drain lines to the heat pump drain pan.

NOTE: The heat pump drain pan is ABS and the two

condensate drain pipes should be PVC.

If a condensate pump is installed it should shut off • the heat pump in the event the condensate pump fails or the float switch in the pump activates (See “Condensate Pump Installation” section.)

Closed System/Thermal Expansion

WARNING

Explosion Hazard

If the temperature and pressure relief valve is dripping or leaking, have a qualified person replace it.

Examples of a qualified person include: licensed plumbers, authorized electric company personnel, and authorized service personnel.

Do not plug valve. Do not remove valve. Failure to follow these instructions can

result in death or explosion.

Most public water systems in North America are required to prevent water flowing from points of use (residences, businesses, etc.) back into the supply system in order to maintain water quality. To accomplish this, back flow preventers such as check valves, are installed in the water line going to each point of use. Typically the back flow preventer will be installed at the water meter or inside a building where the supply line enters the building. This device allows water to flow into the residence but does not allow it to flow back into the water supply. This creates what is known as a “Closed System”. As water is heated by the water heater, the water in the system attempts to expand, but has nowhere to go resulting in an increase in pressure. This increase in pressure in the system may cause the temperature-pressure relief valve to open to relieve the pressure. Water will drip from the temperature and pressure relief valve. Premature tank failure will result if this condition is not corrected. To prevent this condition, a properly-sized thermal expansion tank should be installed in the cold water supply to the water heater as shown in Figure 4. Failure to install a properly sized expansion tank in a closed system will void the warranty on the water heater in the event of tank failure. It is important to follow the thermal expansion tank manufacturers’ installation instructions and to adjust the expansion tank pressure to match the water supply pressure. Contact a plumbing service agency or your retail supplier regarding the installation of a thermal expansion tank.

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