RTGH-84DVLN-3 Direct Vent NG Condensing Tankless Water Heater
Product Information:
The product is a water heater that requires proper mounting,
water connection, gas connection, venting, and electrical wiring.
It is compatible with Schedule 40 PVC, CPVC, and ABS venting. The
water heater operates on a 120VAC power supply and has a power
consumption of 3 to 5 watts during standby and up to 200 watts
during freeze protection operation.
Product Usage Instructions:
Step 1: Mounting the Heater
- Secure the mounting bracket to a support brace on the
wall. - Lower the water heater onto the bracket plate. The bracket can
slide from left to right for alignment. - Secure the lower and upper brackets to the support brace on the
wall to fix them in place. - Refer to the Use & Care Manual for more details on mounting
locations.
Step 2: Water Connection
- Connect cold and hot water at the designated inlets.
- Install service valves and a 150 psi rated pressure relief
valve at the hot water outlet. - 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
- 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. - Install the gas shut-off valve directly on the gas supply
connection on the bottom of the water heater. - Connect the gas piping to the valve.
- Check all connections and fittings for leaks.
- A properly sized and installed gas supply is critical to the
proper operation of this water heater. Refer to the National and
Local Fuel Gas Code for details.
Step 4: Venting
Note: The specific venting instructions may vary based on
the type of vent termination used. Please refer to the Use &
Care Manual for detailed venting requirements and proper
clearances.
- Direct Vent Installation: Compatible with
Schedule 40 PVC, CPVC, and ABS venting (2 or 3). - Concentric Vent Termination: Follow the
recommended slope of 1/4 per foot upward away from the unit. - Flat Vent Termination: Extend the exhaust a
minimum of 12 inches further than the air intake to ensure clean
air when not using a termination kit. - Outdoor Installation Kit: Some venting
configurations may require a DIP switch adjustment. Refer to the
provided chart for vent length and altitude settings.
Step 5: Electrical
- This water heater plugs into a standard 120VAC, 3-prong
grounded outlet for indoor installation. Hard wiring is required
for outdoor installation. Refer to the Outdoor Conversion
Instructions for outdoor installation. - Do NOT connect this water heater to a GCFI or AFCI
circuit. - The water heater draws 3 to 5 watts of current during standby
and up to 200 watts during freeze protection operation.
Start Up
- Enable (Power On): Press the power On/Off
button. - Disable (Power Off): Press the power On/Off
button.
Setting the Temperature
Refer to the DIP switch settings in the Use & Care Manual to
identify the appropriate vent length for your installation.
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.
¾” NPT MALE CONNECTION
STEP 4: VENTING
Venting
DIRECT VENT INSTALLATION
Compatible with Schedule 40 PVC, CPVC, and ABS venting (2″ or 3″). (See Use and Care manual for complete list).
CONCENTRIC VENT TERMINATION
FLAT VENT TERMINATION
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.
OUTDOOR INSTALLATION KIT
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.
SINGLE UNIT: MAX. EQUIVALENT VENT LENGTHS – STRAIGHT PIPE
Number of Max Length 2″ Max Length 3″ 90° Elbows Straight Pipe 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.
INTAKE EXHAUST
START UP
Start Up
ENABLE (POWER ON)
Press the power On/Off button
DISABLE (POWER OFF)
Press the power On/Off button
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
Settings
Identify Vent Length
2″ Vent System Diameter
0 – 2,000 ft Dip
Identify Altitude 2,001- 5,400 ft
Dip
MUST CHANGE FACTORY DIP SETTING
A-0 (Factory Setting)
ON
ON
1234
1234
6 to 21 feet (1.8 to 6.4 meters)
A-1
ON
ON
1234
1234
B-1
ON
ON
1234
1234
21 to 42 feet (6.4 to 12.8 meters)
A-2
ON
ON
1234
1234
B-2
ON
ON
1234
1234
42 to 60 feet (12.8 to 18.3 meters)
A-3
ON
ON
1234
1234
B-3
ON
ON
1234
1234
5,400 – 7,800 ft Dip
C-1 C-2 C-3
ON
ON
1234
1234
ON
ON
1234
1234
ON
ON
1234
1234
Identify Vent Length
6 to 45 feet (1.8 – 13.7 meters)
45 to 150 feet (13.7 to 45.7 meters)
3″ Vent System Diameter
0 – 2,000 ft Dip
Identify Altitude 2,001- 5,400 ft
Dip
A-0 (Factory Setting)
ON
ON
1234
1234
B-0
ON
ON
1234
1234
A-1
ON
ON
1234
1234
B-1
ON
ON
1234
1234
5,400 – 7,800 ft Dip
C-0
ON
ON
1234
1234
C-1
ON
ON
1234
1234
Scan QR Code to download the EcoNet® App (for applicable models only)
TROUBLESHOOTING
Error Codes / Troubleshooting
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 Possible Code Cause
Solution
11
The gas shut-off valve is not fully opened.
Check shut-off valve and open completely.
Gas service has been interrupted.
Check gas supply.
12 Low Gas Supply
Contact a dealer or qualified service technician.
Check Dip Switch settings.
Refer to Dip Switch chart.
29
Condensation Trap is clogged.
Contact a dealer or qualified service technician.
Air intake or vent exhaust opening may be blocked.
Remove any blockage. (Air intake requires 12 in. [30 cm] of clearance.)
90
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 Increase the water flow from the
operate the unit.
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.
Use QR code located on the back cover for additional troubleshooting resources
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)
OPEN TO VIEW INSTALL GUIDE
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
Inspect Product
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)
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
Choosing a Location
Outdoor Conversion Kit (RTGH-X) This water heater can be converted from indoor model to outdoor model if following “Outdoor Conversion Instructions”
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 POSSIBLE DAMAGE 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 shutoff 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.
4. Press the “” or “” button to choose 50″, “75”, “100” or “OF”.
Displayed
50 75 100 OF
Maintenance Notice Hour
500 hours 750 hours 1,000 hours
OFF
IF YOU HAVE A PROBLEM OR ISSUE WITH THIS
WATER HEATER DO NOT RETURN, CALL FIRST.
Manufacturer National Service Department
1-866-720-2076
(AP23365)
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.
PRODUCT INFORMATION MODEL: ________________________ SERIAL #: ________________________ INSTALL DATE: ___________________
INSTALLER INFORMATION NAME: __________________________ COMPANY: ______________________ PHONE: _________________________
