Rheem 7D522B21 Tankless Water Heater Installation Guide

Rheem 7D522B21 Tankless Water Heater

Product Information

• Model: [Insert model number]
• Serial #: [Insert serial number]
• Install Date: [Insert installation date]

Installer Information:

• Name: [Insert installer’s name]
• Company: [Insert installer’s company name]
• Phone: [Insert installer’s phone number]

Product Usage Instructions

Before You Begin

This guide provides a high-level installation overview and addresses key installation questions. It is not a replacement for the Installation Instructions in the Use & Care Manual provided with the water heater. Make sure to follow all instructions,installation requirements, and local or national codes.

It is highly recommended to have this product installed and serviced by a licensed plumber or professional service technician.
Rheem is not responsible for any damages or defects resulting from improper installation.

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indicates which section of the Use & Care Manual to refer to for more information.

This icon provides helpful installation tips.

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A Successful Install Starts Here

Inspect Shipment

Inspect the product upon delivery to ensure it is in good condition.

Find Install Location

Determine the minimum clearance required for your specific model.

Gather Key Accessories (Sold Separately)

• Gas Shutoff Valve Part # RTG20074EH
• Isolation Valves Part # RTG20326
• Horizontal Term. Kit Part # 2-SP20285, 3-SP20286
• Vertical Term. Kit Part # 2-SP202897, 3-SP20245
• Condensate Neutralizer Part # SP12151 or RXGY-A01
• Expansion Tank
• Recirculation Pump Part # AP17920
• Outdoor Conversion Kit (RTGH-X) – This water heater can be converted from an indoor model to an outdoor model by following the Outdoor Conversion Instructions.

Step 1: Mounting the Heater

Mounting:

1. Secure the mounting bracket to a support brace on the wall.
2. Lower the water heater onto the bracket plate. The bracket can slide from left to right for alignment.
3. Secure the lower and upper brackets to the support brace on the
   wall to fix them in place.

Please refer to the Use & Care Manual for more details on mounting locations.

Step 2: Water Connection

Water Quality & Supply:

1. Connect cold and hot water at the designated inlets.
2. Install service valves and a 150 psi rated pressure relief valve at the hot water outlet.
3. A water pressure of 65 psi (448 kPa) is required to achieve maximum flow rate.

Use service valves for future service of the water heater. An expansion tank is required for installations using recirculation.

Step 3: Gas Connection

Gas Supply:

1. Ensure that all gas connections, regulator(s), and meter are sized properly for the BTU/h rating. This unit is 1/2 gas line compatible (see Gas supply section of the Use & Care Manual).

TANKLESS EASY
INSTALLATION GUIDE

Tips for Professional Installation & Product Setup

REGISTER YOUR 15 YEAR WARRANTY
To register your product, scan the QR code located on the back cover. You will need your unit model and serial numbers to complete this process. These can be found on the label on the top panel inside of the tankless water heater

All warranties void after 12,000 hours of operation.

NOTE:
For Warranty Type, select “Standard” for all tankless products. The owner is required to provide proof of purchase/ownership at the time of the claim.

BEFORE YOU BEGIN

This guide is designed to provide a high-level installation overview and address key installation questions. It is not intended to replace the “Installation Instructions” in the Use & Care Manual provided with the water heater. All instructions and installation requirements as well as any local or national codes, must be followed.

It is recommended that this product be installed and serviced by a licensed plumber or a professional service technician. Rheem is not liable for any damages or defects resulting from improper installation.

This icon will tell you which section of the use & care manual to check for more information

This icon will point out helpful Installation tips

This icon will point out information that is key to a safe installation.

A SUCCESSFUL INSTALL STARTS HERE

INSPECT SHIPMENT
• Check product for damage
• Ensure all pieces in box

FIND INSTALL LOCATION
Consider The Following:

• Sturdy Wall
• Gas, Water, and Power supply
• Venting Termination
• Condensate Neutralizer and Drain
• Enough space – see below for minimum clearance required (all models)

GATHER KEY ACCESSORIES (SOLD SEPARATELY)

Outdoor Conversion Kit (RTGH-X)
This water heater can be converted from indoor model to outdoor model if following “Outdoor Conversion Instructions”

STEP 1: MOUNTING THE HEATER

Mounting

1. Secure the mounting bracket to a support brace on the wall

2. Lower the water heater onto the bracket plate.
   Bracket can slide from left to right for alignment.

3. Secure the lower and upper bracket to the support brace on the wall to fix in place

Please see Use & Care Manual for more details on mounting locations.

STEP 2: WATER CONNECTION

Water Qualty & Supply

1. Connect cold and hot water at designated inlets
2. Install service valves and a 150 psi rated pressure relief valve at hot water outlet.
3. Water pressure of 65 psi (448 kPa) is required to achieve maximum flow rate

Use service valves for future service of the water heater. Expansion Tank required for installations using Recirculation.

STEP 3: GAS CONNECTION

Gas Supply

1. Ensure that all gas connections, regulator(s), and meter are sized properly for the BTU/h rating. This unit is 1/2” gas line compatible (see Gas supply section of the Use & Care Manual)
2. Install the gas shut-off valve directly on the gas supply connection on the bottom of the water heater
3. Connect the gas piping to the valve
4. Check all connections and fittings for leaks

A properly sized and installed gas supply is critical to the proper operation of this water heater. Please see National and Local Fuel Gas Code for details.

CONDENSATION LINE
Condensate

External Condensate Neutralizer should be installed in accordance with local codes.

STEP 4: VENTING

DIRECT VENT INSTALLATION
Compatible with Schedule 40 PVC, CPVC, and ABS venting (2” or 3”). (See Use and Care manual for complete list).

It is recommended that the air intake pipe and exhaust pipe have a 1/4” per foot upward slope away from the unit.
When not using a termination kit, extend the exhaust a minimum of 12 inches further than the air intake to ensure clean air.

2″ Venting may REQUIRE a DIP switch adjustment! See chart below for vent length and altitude settings.

Please see Venting section of the Use & Care Manual for detailed venting requirements and proper clearances.

CONCENTRIC VENT TERMINATION

FLAT VENT TERMINATION

OUTDOOR INSTALLATION KIT

SINGLE UNIT: MAX. EQUIVALENT VENT LENGTHS – STRAIGHT PIPE

Number of 90° Elbows| Max Length 2” Straight Pipe| Max Length 3” Straight Pipe
0| 60 ft. (18.3 m)| 150 ft. (45.7 m)
1| 54 ft. (16.5 m)| 144 ft. (43.9 m)
2| 48 ft. (14.6 m)| 138 ft. (42.7 m)
3| 42 ft. (12.8 m)| 132 ft. (40.2 m)
4| 36 ft. (11.0 m)| 126 ft. (38.4 m)
5| 30 ft. (9.1 m)| 120 ft. (36.6 m)
6| 24 ft. (7.3 m)| 114 ft. (34.7 m)

EQUIVALENT FT. OF ELBOWS

 | 2” Pipe| 3” Pipe
90O| 6 ft (1.83 m)| 6 ft (1.83 m)
45O| 3 ft. (0.9 m)| 3 ft. (0.9 m)

STEP 5: ELECTRICAL

Electrical Wiring

1. This water heater plugs into a standard 120VAC,3-prong grounded outlet for indoor installation.
   Hard wiring is required for outdoor installation.
   Refer to “Outdoor Conversion Instructions” for outdoor installation.

2. Do NOT connect this water heater to a GCFI or AFCI circuit.

This water heater draws 3 to 5 watts of current during standby, and up to 200 watts during the freeze protection operation.

STARTUP

ENABLE (POWER ON)
Press the power On/Off button
DISABLE (POWER OFF)
Press the power On/Off button

Scan QR Code to download the
EcoNet® App (for applicable models only)

SETTING THE TEMPERATURE
Press the “▲” or “▼” button to adjust temperature between 100-120°F.
To adjust set point above 120°F, press the “▲” button repeatedly until 120°F shows in the display.
Hold the “▲” button until the “120” on the display starts to blink.
Press and hold the “▲” button for 5 seconds to set above 120. Maximum set point is 140°F.

DIP SWITCH

TROUBLESHOOTING

Error Codes / Troubleshooting
If a problem occurs, the unit will stop operating and display an error code. The most common error codes on start-up are:

Error Code| Possible Cause|

Solution

---|---|---

11

| The gas shut-off valve is not fully opened.| Check shut-off valve and open completely.

12

| Gas service has been interrupted.|

Check gas supply.

Low Gas Supply

| Contact a dealer or qualified service technician.
Check Dip Switch set- tings.|

Refer to Dip Switch chart.

29| Condensation Trap is clogged.| Contact a dealer or qualified service technician.
90| Air intake or vent exhaust opening may be blocked.| Remove any blockage. (Air intake requires

12 in. [30 cm] of clearance.)

The vent pipes on the vent termination may not be connected properly.| Contact a dealer or qualified service technician.
P1| Not enough water flow to operate the unit.| Increase the water flow from the fixtures.

CLEARING ALARMS

1. Turn off all hot water faucets.

2. Turn off the water heater by pressing the Power ON/OFF button.

3. Wait 5 minutes and then restart the water heater.
   Press the POWER ON/OFF button.

4. Turn on a hot water faucet and check the display for errors.

5. If the error remains, turn off the faucet and water heater. Unplug the water heater from power source. Wait 30 seconds and plug back in. Repeat steps 1 thru 4.

6. If error code still remains, turn off faucet and water heater. Call for service assistance at the number listed in the Customer Service box below.

For all other codes not listed, please contact a dealer or qualified service technician.

CUSTOMER SERVICE/NEED HELP

HAVE QUESTIONS?
NEED HELP TROUBLESHOOTING?

Get the unit’s Model and Serial Numbers ready and contact us: US 1.800.432.8373 /Canada 1.800.268.6966
Be sure to have your Model and Serial Numbers before calling customer service (located on the water heater’s Rating Label)

Use QR code located on the back cover for additional troubleshooting resources

TIPS & MAINTENANCE

DRAINING THE WATER HEATER
WARNING: IF THE BUILDING IS TO REMAIN UNOCCUPIED FOR AN EXTENDED PERIOD, IT IS RECOMMENDED THAT THE TANKLESS WATER HEATER BE DRAINED TO PREVENT POSSIBLEDAMAGE DUE TO FREEZING CONDITIONS.

Draining the Water Heater

Scan for additional information regarding install, servicing, and warranty registration.

FLUSHING THE UNIT
To ensure the best continued performance from your tankless water heater, we recommend cleaning your unit every year to year and a half. This process is called “flushing.” Please refer to proper flushing procedures which can be found utilizing the QR code below.
To make this servicing even easier for you to remember, we’ve added a Maintenance Notification Setting to remind you that it is time to flush via a flashing code “88” on your tankless display or through the Econet® App on your phone (Wi-Fi Models Only).

SETTING SERVICE ALERT HOURS

1. Press power button on the front control to turn off.
2. Turn off the gas and water by closing the shut-off valves.
3. Press and hold the “▲” or “▼” button until “1Y” is displayed.
4. Press the “▲” or “▼” button until “8A ” is displayed. Press and hold the power button on the display for 1 second.
5. Press the “▲” or “▼” button to choose 50”, “75”, “100” or “OF”.

IF YOU HAVE A PROBLEM OR ISSUE WITH THIS WATER HEATER DO NOT RETURN, CALL FIRST.
Manufacturer National Service Department
1-866-720-2076

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