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Rheem 199,000 Btu/hr User Manual

High efficiency condensing tankless water heater
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HIGH EFFICIENCY CONDENSING
TANKLESS WATER HEATER
199,000 Btu/hr Model
WARNING: If the information in this manual is not followed exactly, a fire or
explosion may result causing property damage, personal injury, or loss of life.
Do not store or use gasoline or other flammable vapors and liquids or other
combustible materials in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified licensed
service agency or the gas supplier.
(Natural Gas or Propane)
licensed installer,

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  • Page 1 HIGH EFFICIENCY CONDENSING TANKLESS WATER HEATER 199,000 Btu/hr Model (Natural Gas or Propane) WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury, or loss of life. Do not store or use gasoline or other flammable vapors and liquids or other combustible materials in the vicinity of this or any other appliance.
  • Page 2 TANKLESS WATER HEATER 199 SAFETY CONSIDERATIONS WARNING Installation, start-up and servicing of the unit must be done with due If the information in this care and attention, and must only be performed by competent, qualified, manual is not followed exactly, a fire or explosion licensed and trained heating technicians.
  • Page 3 TANKLESS WATER HEATER 199 SPECIFICATIONS SPECIFICATION 199,000 BTU Input (Natural Gas or Propane*) - MBH 28.5-199 U.E.F DHW Flow Rate - USgpm / l/m 35°F (19°C) Temp Rise 10.1 (38) 45°F (25°C) Temp Rise 7.9 (30) 67°F (36°C) Temp Rise 5.4 (20) Dimensions - in/mm 17.7 x 29.8 x 10.9 (450 x 757 x 277)
  • Page 4 150psi of domestic water pressure and a minimum relieving capacity of 199,000 Btu/hr with 3/4" NPT threads. For safe operation of the unit, the relief valve must not be removed from its designated point of installation or plugged.

  • Page 5: Table Of Contents

    TANKLESS WATER HEATER 199 CONTENTS 1.0 INSTALLATION ......... . 1-1 1.1 GENERAL.
  • Page 6 TANKLESS WATER HEATER 199 3.3 COMMISSIONING ..........3-2 3.4 FUEL CONVERSION .
  • Page 7 TANKLESS WATER HEATER 199 PRE-INSTALLATION CHECK DANGER Should overheating occur Carefully consider clearances and access, vent travel and termination, gas or the gas supply fails to supply, condensate removal and combustion air supply. shut off, do not turn off or Consider the following: disconnect the electrical •...
  • Page 8 TANKLESS WATER HEATER 199 This page is intentionally left blank. INSTALLATION AND OPERATION INSTRUCTIONS...

  • Page 9: Installation

    TANKLESS WATER HEATER 199 1.0 INSTALLATION NOTE Commercial use is allowed only if the unit is regularly 1.1 GENERAL maintained, and the heat exchanger is cleaned at least This High Efficiency Condensing tankless water heater is designed to be used for once a year, or more often if the unit is experiencing heavy domestic (residential) purposes.
  • Page 10 TANKLESS WATER HEATER 199 BRACKET 16in [406mm] BRACKET 4.7in 4.7in [120mm] [120mm] 4.5in [114mm] B (ALTERNATE) B (ALTERNATE) 3.7in 2.6in [95mm] [65mm] [50mm] 6.7in [170mm] BOTTOM Figure 1b: Dimensions / Connections for Tankless Water Heater Tankless Water Heater DESCRIPTION TANKLESS WATER HEATER TANKLESS WATER HEATER Exhaust Outlet 2"...

  • Page 11: Code Requirements

    TANKLESS WATER HEATER 199 1.2 CODE REQUIREMENTS WARNING - Keep the unit area free he Tankless Water Heater is is certified under CSA 4.3 / ANSI Z21.10.3. and clear of combustible T T he Tankless Water Heater materials, gasoline, and other The installation must conform to the requirements of the authority having flammable vapors and liquids. jurisdiction or, in the absence of such requirements, to the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or Natural Gas and Propane Installation Code, CAN/CSA B149.1.

  • Page 12: Mobile Home Installations

    TANKLESS WATER HEATER 199 DISTANCE FROM RECOMMENDED DISTANCE WARNING SURFACE COMBUSTIBLE FOR INSTALLATION AND SURFACES SERVICE - Exposed water piping and associated components Front 2" 24" (relief valves, circulators, etc.) Rear 0" 0" must not be in contact with 6" (labels may be difficult to read with combustible materials.

  • Page 13: Removing/Installing The Front Panel

    TANKLESS WATER HEATER 199 1.3.2 Removing/installing the front panel CAUTION • The front panel of the unit must be removed to perform various maintenance The front panel has a rubber activities. seal around the inner edge • sometimes making it very stiff Loosen both screws (1) under the unit by using a 5 mm allen key.

  • Page 14: Exhaust Venting And Air Intake

    TANKLESS WATER HEATER 199 1.4 EXHAUST VENTING AND AIR INTAKE DANGER Failure to properly vent When you plan the installation, ensure that you consider appropriate venting the unit to the outdoors materials, travel and termination decisions. as outlined in this Venting section will result in death Consider the following when selecting a vent termination location: or serious personal injury.
  • Page 15 TANKLESS WATER HEATER 199 In the Commonwealth of Massachusetts NOTE The Commonwealth of Massachusetts requires compliance with regulation 248 For the State of CMR 4.00 and 5.00 for installation of through-the-wall vented gas appliances as Massachusetts, use only follows: plastic piping, fittings (a) For all side-wall, horizontally vented, gas-fueled equipment installed in every and vent terminations as specified in this manual dwelling, building, or structure used in whole or part for residential purposes, which are approved by the including those owned or operated by the Commonwealth and where the side-...
  • Page 16 TANKLESS WATER HEATER 199 (c) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING SYSTEM PROVIDED. When the manufacturer of product-approved side-wall, horizontally vented, gas-fueled equipment provides a venting system design or venting system components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall include: 1. Detailed instructions for the installation of the venting system design or the venting system components; and 2. A complete parts list for the venting system design or venting system. (d) MANUFACTURER REQUIREMENTS –...
  • Page 17 TANKLESS WATER HEATER 199 Removal of Existing Unit from Common Venting CAUTION When an existing appliance is removed from a common venting system, the - The minimum wall thickness common venting system is likely to be too large for proper venting of the for venting is 1"...

  • Page 18: Applications

    TANKLESS WATER HEATER 199 1.4.1 Applications WARNING All Tankless Water Heaters must be installed as a Direct Vent venting system. - Do not mix venting materials The combustion air must be piped in from the outdoors and connected directly from different venting to the unit’s combustion air connection. See section 1.4.7 for air intake piping manufacturers.
  • Page 19 TANKLESS WATER HEATER 199 For 3" Flexible PPs, up to 35 actual lineal feet are allowed in a nominally vertical WARNING orientation (>45°). The equivalent length of 3" Flexible PPs is calculated using a multiple of 1.4:1, e.g. 35' x 1.4 = 49' equivalent. The balance of the venting Combustion air must not be allowance is still available for use with rigid PPs piping material. drawn from areas containing corrosive air from swimming 2"...

  • Page 20: Venting Passage Through Ceiling And Floor

    TANKLESS WATER HEATER 199 Secure joints using appropriate solvent cement to bond the respective pipe CAUTION material (Canada: PVC/CPVC cement approved under ULC-S636, in accordance with its manufacturer instructions; USA: PVC (ASTM D2564), or CPVC (ASTM Vent termination clearances F493). Use transition cement anywhere that PVC and CPVC are joined. Follow in this section are code the cement manufacturer’s instructions closely when joining various components. minimum, or recommended minimum requirements, For PPs, connections must be secured using approved retainer clips supplied by and may be inadequate for the respective PPs manufacturer.
  • Page 21 TANKLESS WATER HEATER 199 • Optional bird screen may be placed in a termination fitting. Leave unglued, and hold in place with a short nipple to allow easy access for cleaning. • For roof top venting of multiple unit sets, group all intake terminals together for a common penetration through a custom cap. Alternatively, place in the closest proximity achievable using commonly available pipe flashing.

  • Page 22: Sidewall Vent Termination

    TANKLESS WATER HEATER 199 1.4.6 Sidewall Vent Termination WARNING Direct Vent - Two Pipe - You must maintain at least the minimum separation of Sidewall direct vent applications must be vented as follows: exhaust vent termination from • Both the inlet and exhaust terminations must be must be located on the same plane unit’s intake air as illustrated (side) of the building.
  • Page 23 TANKLESS WATER HEATER 199 [91mm] [305mm] [305mm] [152mm] 12" [305mm] MIN. [152mm] Figure 15: Sidewall vent termination - multiple vent piping configuration For sidewall venting of multiple units, group all intake terminals together with 6" (minimum) lateral spacing, and similarly group the exhaust pipes. Place the 2 groups on the same plane of the building (e.g., north facing wall).
  • Page 24 TANKLESS WATER HEATER 199 Concentric Side Wall Termination Kits Concentric Sidewall Termination kits approved for use with the tankless water heater are subject to restrictions. NOTE: Some jurisdictions may not allow this type of sidewall termination due to close proximity to the neighboring properties. You must follow the installation instructions, clearances, and wall thickness requirements of the approved vent termination manufacturer.
  • Page 25 TANKLESS WATER HEATER 199 Vent terminal clearance minimums are as follows: WARNING CANADIAN - In addition to preventing INSTALLATIONS INSTALLATIONS 1, 3 2, 3 ingestion of chemical A= Clearance above grade, 12 in (30 cm) 12 in (30 cm) contaminants, care must veranda, porch, deck, or balcony be taken to ensure air B= Clearance to window or door 36 in (91 cm) for appliances...

  • Page 26: Direct Vent" Combustion Air Intake Piping

    TANKLESS WATER HEATER 199 Vent terminal Air supply inlets Figure 19: Vent Terminal Clearance Area where terminal is not permitted 1.4.7 “Direct Vent” Combustion Air Intake Piping The unit must always be installed as a Direct Vent venting system with the combustion air piped directly from the outdoors to the unit’s combustion air connection.

  • Page 27: Indoor Air" Combustion Air Intake

    TANKLESS WATER HEATER 199 Intake Pipe Sizing For 3" Flexible PPs, you can use up to 35 actual linear feet in a nominally vertical orientation (>45°). The equivalent length of 3" Flexible PPs must be calculated using a multiple of 1.4:1, e.g. 35' x 1.4 = 49' equivalent. The balance of the venting allowance is still available for use with rigid PPs piping material. 2" Flexible PPs is not allowed. INTAKE PIPE SIZE/FITTINGS MAXIMUM EQUIVALENT LENGTH Schedule 40 PVC, ABS, CPVC or PPs –...

  • Page 28: Condensate Removal

    TANKLESS WATER HEATER 199 1.5 CONDENSATE REMOVAL WARNING Fill the trap with water before The specified vent configuration promotes the safe drainage of moisture from the initial startup of the unit to unit and exhaust venting without flowing liquids back through the heat exchanger. prevent exhaust fumes from entering the room. Never Reliable system operation requires (1) proper design and installation of exhaust operate the water heater venting to allow condensate to run back to the drain/trap; (2) acid neutralization unless the trap is filled with as appropriate.

  • Page 29: Further Installation Details

    TANKLESS WATER HEATER 199 1.5.3 Further Installation Details DANGER • Pipe the condensate drain to within 1" of a drain, or connect it to a condensate The water in the condensate pump. neutralizer can cause severe • burns to the skin. Use extreme Slope the drainage line down to the drain at a pitch of 1/4"...

  • Page 30: Water And Space Heating Application

    TANKLESS WATER HEATER 199 1.6 WATER AND SPACE HEATING DANGER APPLICATION When this system requires water for space heating at elevated temperatures (above The following guidelines must be followed when using the water heater for both 125°F [52°C]), a mixing or potable water heating and space heating.
  • Page 31 TANKLESS WATER HEATER 199 NOTE Tankless Connection to space-heating Water Heater circuit through potable water system as shown may be prohibited by local code. Non-ferrous pump (sized for combined head loss of water heater and air handler) Check valve (may be built into pump) Potable water expansion tank Mixing valve Figure 24: DHW and Air Handler Piping...

  • Page 32: Domestic Hot Water System

    150psi of domestic water pressure and a minimum relieving capacity of 199,000 Btu/hr with 3/4" NPT threads. For safe operation of the unit, the relief valve must not be removed from its designated point of installation or plugged.
  • Page 33 TANKLESS WATER HEATER 199 1.7.1 Domestic Hot Water System WARNING This Tankless Water Heater has a copper piping circuit for efficiently generating HOT WATER CAN SCALD! Domestic Hot Water. When a faucet is opened to draw hot water, water flow is Water Temperatures over 125°F detected with a flow sensor and the unit fires up to begin generating domestic hot / 52°C can cause severe burns water. instantly or death from scalds. Children, disabled, and elderly are The heat exchanger has copper water passageways encased in the aluminum heat transfer block. The aluminum heat exchanger acts as a heat buffer, at highest risk of being scalded.

  • Page 34: Domestic Hot Water Piping

    TANKLESS WATER HEATER 199 1.7.2 Domestic Hot Water Piping NOTE The domestic water piping connections are located at the bottom of the unit, see See Domestic Hot Water Figure 1b. The connections are " male NPT threads. The cold water inlet is on Warnings on page 1-25.

  • Page 35: Tankless Domestic Hot Water With A Storage Tank

    The storage tank aquastat will enable the pump causing the unit to fire when the DOMESTIC HOT WATER DELIVERY temperature drops below the aquastat setpoint. The units DHW setpoint must be set higher than the storage tank aquastat setpoint. Once the storage tank @ 67°F / 37.2°C temperature temperature has reached its setpoint, the aquastat will disable the pump. rise 199,000 Btu/hr 199,000 Btu/hr 5.4 GPM Tankless Combi Boiler Water Heater Tankless Combi Boiler Water Heater Aquastat Figure 26: Tankless DHW Piping Options – concept drawing. This drawing is only a simple schematic guide.
  • Page 36 TANKLESS WATER HEATER 199 See the Tankless Water Heater Controller Manual for required parameter changes Figure 27: Typical DHW Recirculation piping – concept drawing. This drawing is only a simple schematic guide 1-28 INSTALLATION AND OPERATION INSTRUCTIONS...

  • Page 37: Gas Piping

    3.3 for further instruction. If MODEL 1/2" IPS 3/4" IPS 1" IPS converting a unit from one 199,000 Btu/hr 199,000 Btu/hr (Natural Gas) 150' fuel to another, you must order a conversion kit prior 199,000 Btu/hr 199,000 Btu/hr (Propane) 125' 400' to the conversion.

  • Page 38: Electrical Connections

    TANKLESS WATER HEATER 199 1.9 ELECTRICAL CONNECTIONS WARNING Do not apply power to any Electrical wiring to the unit (including grounding) must conform to local electrical connection point on the codes and/or National Electrical Code, ANSI/NFPA No. 70 – latest edition, or The controllers terminal strips.

  • Page 39: Unit System Operation

    TANKLESS WATER HEATER 199 2.0 UNIT SYSTEM OPERATION 2.1 GENERAL The Tankless Water Heater can be used as a tankless water heater, with or without a storage tank. The unit is equipped with an electronic unit controller that ignites the burner and continuously monitors the flame throughout each call for heat. The controller also displays the current operating conditions of the unit and any error messages should a problem occur.

  • Page 40: Control

    TANKLESS WATER HEATER 199 2.2 CONTROL ICON FUNCTION Numerical Display Main Display Temperature Adjustment Plus & Minus Flame Burner ON Indicator Power ON Indicator Faucet DHW Indicator Wrench Service / Reset Return Arrow Enter / Save Numerical Display Service Display Table 7: Controller Indicators and Touch Pad 2.3 INSTALLER INTERFACE 2.3.1 Turning Appliance ON/OFF To turn on the unit, touch the area above the dot for 2 seconds.

  • Page 41: Programming Mode

    TANKLESS WATER HEATER 199 2.3.2 Programming Mode NOTE There are two parameters available in the User Setup Menu. The domestic hot water The controller has five levels: User Menu, Installer Menu (code 15), a Master thermostat is adjusted to its lowest temperature position Installer Menu (code 20), RF Menu (code 30) and Cascade Menu (code 35). See included Controller Manual for details.

  • Page 42: Tankless Domestic Hot Water Modes

    TANKLESS WATER HEATER 199 2.4 TANKLESS DOMESTIC HOT WATER MODES 2.4.1 Tankless Domestic Hot Water - Standard and ECO Comfort Modes Standard Mode (OFF): The heat exchanger will not maintain its domestic hot water temperature between demands for hot water. Comfort Mode (ON): The heat exchanger is maintained at the DHW temperature.

  • Page 43: Sequence Of Operation

    TANKLESS WATER HEATER 199 2.5 SEQUENCE OF OPERATION When the unit is powered up the controller enters a self-diagnostic mode, and displays the controller software version in the main display. The sequence of operation is as follows: The unit receives a call for for domestic hot water heating from the internal flow sensor. The unit performs a safety check and energizes the fan for a pre-purge (Service Display = 3).

  • Page 44: Accessing The Information Menu

    TANKLESS WATER HEATER 199 2.6 ACCESSING THE INFORMATION MENU NOTES The unit is equipped with a frost protection feature. This The Information menu provides real time operating information to assist with feature operates the unit’s troubleshooting. burner to help protect the unit To access the Information menu: from freezing.
  • Page 45 TANKLESS WATER HEATER 199 See below for a description of the codes: Table 9: Information Menu Note that display parameters may differ depending on the configuration. Where there is no DHW sensor, the display reading can be ignored. STARTUP AND COMMISSIONING...

  • Page 46: Resetting The Maintenance Counter

    TANKLESS WATER HEATER 199 2.7 RESETTING THE MAINTENANCE CAUTION COUNTER The maintenance counter must only be reset after performing the maintenance Inspection of the unit must be performed annually by a qualified service procedures in Section technician. This unit includes a maintenance counter which tracks the amount of 4.0 Maintenance of this fuel burned within a two year period to ensure maintenance is performed if usage manual.
  • Page 47 TANKLESS WATER HEATER 199 The code numbers are displayed in the left numerical display. 4. Change C000 to C090 by touching the + button. 5. Touch wrench to enter the maintenance menu. The current maintenance counter value is displayed in the left numerical display. STARTUP AND COMMISSIONING...
  • Page 48 TANKLESS WATER HEATER 199 TANKLESS WATER HEATER 199 The following notifications will be displayed as the time for maintenance approaches. MAINTENANCE COUNTER NOTIFICATION CODE n120 - Maintenance recommended n121 - Maintenance required, limited DHW output n122 - Maintenance required, no DHW output The notification code will be displayed for 30 seconds and the wrench will flash. Press the wrench button to see the notification code again after 30 seconds. 6. Touch the wrench to reset the maintenance counter to 0. 7. Touch return to resume normal operation. P will be briefly displayed on the right screen to indicate the change has been stored.

  • Page 49: Startup & Commissioning

    TANKLESS WATER HEATER 199 3.0 STARTUP & COMMISSIONING 3.1 LIGHTING & SHUTTING DOWN THE UNIT (LP) STARTUP AND COMMISSIONING...

  • Page 50: Prior To Start-Up

    MODEL NATURAL GAS PROPANE TO LOW CALORIFIC TO PROPANE NATURAL GAS NATURAL GAS 199,000 Btu/hr P-081014 P-081024 P-081414 Table 10: Fuel conversion kits The gas valve will automatically de-rate the maximum input by approximately 2% per 1,000’ above sea level. The gas valve’s zero governor will ensure that the gas-air mixture is not affected at altitude. INSTALLATION AND OPERATION INSTRUCTIONS...
  • Page 51 TANKLESS WATER HEATER 199 To verify the proper operation of the gas valve in the field, the following procedure WARNING can be carried out by a qualified technician (see diagrams on this page). Check the rating plate of the Turn off the unit’s manual gas valve. With a Torx 15 screwdriver, open unit to ensure it is configured the inlet gas supply pressure test port by turning its screw 1 full turn for the fuel you are using. If counterclockwise.

  • Page 52: Fuel Conversion

    CO LIMIT ( PPM ) AT HIGH FIRE WITH THE FRONT COVER OPEN² ORIFICE MODEL SIZE Max. CO limit < 150ppm <250ppm VALUE ( % ) AT LOW FIRE WITH THE FRONT COVER OPEN 199,000 Btu/hr 199,000 Btu/hr = value at High = value at High – 0.3% Max. CO value Min. CO value 8.7%...

  • Page 53: Gaining Access To Combustion Chamber, Burner Removal Instructions

    TANKLESS WATER HEATER 199 WARNING Each unit is equipped with a back flow valve installed at the outlet of the fan. Inspect the back flow flapper annually. Figure 34: Back Flow Valve Figure 35: Blower and Gas Valve Assembly 3.4.1 Gaining access to combustion chamber, burner NOTE removal instructions The Caution reguarding...
  • Page 54 TANKLESS WATER HEATER 199 TANKLESS WATER HEATER 199 REASSEMBLY Replace the heat exchanger gasket. Inspect, and when needed change other gaskets. If necessary, inspect and clean the gasket mating surface. Place the heat exchanger cover onto the heat exchanger and loosely install the 6mm Allen bolts and lock washers removed in step 6.

  • Page 55: Maintenance

    TANKLESS WATER HEATER 199 4.0 MAINTENANCE WARNING - Fill the trap with water 4.1 WATER HEATER MAINTENANCE before the unit is first fired to prevent exhaust fumes from entering the room. Never 4.1.1 General Care operate the unit unless the •...

  • Page 56: Heat Exchanger

    TANKLESS WATER HEATER 199 4.1.6 Heat Exchanger CAUTION During annual inspection (with the heat exchanger cover removed), examine The heat exchanger has a small the heat exchanger for signs of contamination and clean if necessary. In areas amount of combustion chamber of poor gas quality or contaminated combustion air, there may be a build-up of insulation (refractory) that black plaque (typically sulfur). Other fouling agents are airborne dust, debris and...

  • Page 57: Dhw Filter Cleaning Instructions

    TANKLESS WATER HEATER 199 The recommended pH of the domestic water is between 6.5 and 8.5. The internal CAUTION domestic water heat exchanger tubing and the flow sensor are subject to fouling Before testing the relief valve, if exposed to hard water (over 7 grains of hardness) or has a TDS of 500mg/L or higher.

  • Page 58: Fan Installation Instructions

    TANKLESS WATER HEATER 199 4.1.14 Fan installation instructions DANGER When servicing or replacing Place the fan gasket on the outlet of the fan housing. The gasket has 2 locator pins to ensure the gasket does not move during installation. the fan, you must transfer the venturi from the old fan to the Reinstall the check valve in the burner housing and attach the fan to the new fan.
  • Page 59 TANKLESS WATER HEATER 199 Clean the following components with water: ● the inside of condensate trap base ● plastic ball ● circlip ● condensate trap cup ● opening of the flue pipe 2 ¼" (60 mm) Return the plastic ball to the condensate trap base and attach the circlip. DANGER Check that the ball and circlip have been installed correctly (6).

  • Page 60: Reset The Maintenance Counter

    TANKLESS WATER HEATER 199 4.1.16 Reset the Maintenance Counter CAUTION The maintenance counter should be reset after all maintenance items in this The maintenance counter section have been completed. Refer to Resetting the Maintenance Counter, must only be reset after section 2.7 of this manual.

  • Page 61: Troubleshooting

    TANKLESS WATER HEATER 199 5.0 TROUBLESHOOTING The troubleshooting section is divided into four sections: 5.1 Preliminary Checks NOTE 5.2 Electronic Components This appliance is equipped 5.3 Faults and Notifications with a blocked vent shut-off 5.4 Other Faults system that closes the gas supply when it detects an Often, you can identify and solve a problem through simple checks of the basics: irregular venting condition.

  • Page 62: Electronic Components

    TANKLESS WATER HEATER 199 5.2 ELECTRONIC COMPONENTS This section details the method for troubleshooting the non-standard electronic components on the unit. 5.2.1 Temperature Sensors The resistance of the temperature sensors varies inversely with temperature. To test, measure the temperature of the sensed environment and compare with the value derived from the measurement of the resistance (obtained by connecting a good quality test meter capable of measuring up to 5,000 KΩ (5,000,000Ω) at the controller end of the sensor lead).

  • Page 63: Flue Gas Temperature Sensor

    TANKLESS WATER HEATER 199 5.2.3 Flue Gas Temperature Sensor This sensor ensures that the unit shuts down safely if the flue temperature is above normal. High flue temperatures can be an indication that the heat exchanger requires cleaning. The flue gas temperature sensor is located at the top of the rear flue passage, below the top panel. To remove the sensor, unclip from the wiring harness and unscrew from the rear flue passage. 5.2.4 Domestic Hot Water Flow Sensor The unit is equipped with a flow sensor to measure water flow through the domestic hot water circuit in the water heater. The flow sensor consists of two parts, the mechanical turbine in the cold water inlet and the external inductive sensor surface mounted on the outside of the cold water inlet. The minimum flow Figure 40: Flue gas Temperature required to activate the water heater is 0.5 GPM or 2 L/min.

  • Page 64: Domestic Hot Water Bypass Valve

    TANKLESS WATER HEATER 199 5.2.6 Domestic Hot Water Bypass Valve This unit is equipped with a domestic hot water bypass valve which allows cold water to bypass the heat exchanger to temper the domestic hot water temperature. 1. To service or replace the bypass valve: 2. Turn off the unit and disconnect power. 3. Close the DHW hot and cold isolation valves. 4.

  • Page 65: Faults And Notifications

    TANKLESS WATER HEATER 199 5.3 FAULTS AND NOTIFICATIONS 5.3.1 Fault Codes During operation the controller can detect unusual situations and can take action to avoid damage to the heat exchanger or other unsafe operations. During these situations, the controller limits the temperature and power output of the burner, or temporarily disables operation entirely.
  • Page 66 TANKLESS WATER HEATER 199 No flame detected during operation. • F005 Verify condensate drain is not blocked. • Check vent and combustion air piping for blockage. • Check for flue gas recirculation. • If vent termination is subject to high winds, reconfigure/relocate as necessary. • Verify gas inlet pressure is at least 4” at both low and high fire.
  • Page 67 TANKLESS WATER HEATER 199 • F013 DHW inlet temperature sensor open/ Verify wire harness connections at DHW inlet short temperature sensor and control module are tight. • Check resistance of DHW inlet temperature sensor, replace sensor if open/short circuit is found •...
  • Page 68 TANKLESS WATER HEATER 199 • F040 Cabinet temperature sensor open. Verify wire harness connections at cabinet temperature sensors and control module are tight. • Check resistance of cabinet temperature sensors, replace sensor if open circuit is found. • Check resistance of cabinet temperature sensors at control module harness connector, repair wire harness if open circuit is found.

  • Page 69: Notification Codes

    TANKLESS WATER HEATER 199 5.3.2 Notification Codes During operation the controller can also detect unusual situations and display a notification, usually without significant interruption of the normal operation of the appliance. These notifications are shown on the main display, and display only when an unusual reading is currently detected. Once the error has been resolved, the operation will be restored Note that these notifications only appear on controllers installed with software versions after 1.80. The software version of the controller will appear upon the controller’s initial start up.

  • Page 70: Other Faults

    TANKLESS WATER HEATER 199 • Flue temperature is not changing while unit is fired. n152 Flue temperature sensor mounting fault • Verify flue temperature sensor is properly mounted on the vent pipe. • n201 Heat exchanger air purge function Air trapped in the heat exchanger activated • Closed boiler isolation valve • Defective boiler pump High flue temperature, burner • n202 Verify the unit has been converted to propane if operating on disabled...

  • Page 71: Domestic Hot Water Does Not Reach The Correct Temperature

    TANKLESS WATER HEATER 199 5.4.2 Domestic hot water does not reach the correct temperature POSSIBLE CAUSES ANALYSIS POSSIBLE SOLUTION Domestic hot water flow is too high. → Yes Reduce the domestic hot water flow. ↓No → Yes Setting for domestic hot water Increase the domestic hot water temperature. temperature is too low. ↓No Insufficient heat transfer due to calcium or → Yes De-calcify or flush the domestic hot water-sided central...
  • Page 72 TANKLESS WATER HEATER 199 This page is intentionally left blank. 5-12 INSTALLATION AND OPERATION INSTRUCTIONS...

  • Page 73: Replacements Kits

    TANKLESS WATER HEATER 199 6.0 REPLACEMENTS KITS Replacement Kit Numbers Replacement Kit Description Conversion To Propane - Venturi 375 P-081014 Conversion To Natural Gas - Venturi 375 P-081024 Conversion To Low Calorific Gas - Venturi 375 P-081414 Replacement kit: Flue Temperature Sensor P-081134 Replacement kit: Ignitor P-081144...

  • Page 74: Wiring Diagrams

    TANKLESS WATER HEATER 199 7.0 WIRING DIAGRAMS Diagram 6.2-1: Schematic wiring diagram INSTALLATION AND OPERATION INSTRUCTIONS...
  • Page 75 TANKLESS WATER HEATER 199 Diagram 6.2-2: Electrical wiring diagram DIAGRAMS...

  • Page 76: Installation & Commissioning Report

    TANKLESS WATER HEATER 199 INSTALLATION & COMMISSIONING REPORT Water Heater Details: Model Number _____________________ Serial Number ______________________________________________ Date of Installation ______________ Address of installation __________________________________________ _____________________________________________________________________________________________ User contact information _______________________________________________________________________ Installer Information Company ___________________________________________________________________ Address ______________________________________________________________________________________ Phone/Fax/E mail ____________________________________________________________________________ Fuel Natural Gas Propane Gas Supply Pressure (high fire) _______ Inches w.c.

  • Page 77: Service Record

    TANKLESS WATER HEATER 199 SERVICE RECORD DATE LICENSED CONTRACTOR DESCRIPTION OF WORK DONE DIAGRAMS...

  • Page 78: Notes

    TANKLESS WATER HEATER 199 NOTES INSTALLATION AND OPERATION INSTRUCTIONS...
  • Page 79 TANKLESS WATER HEATER 199 This page is intentionally left blank. DIAGRAMS...
  • Page 80 Rheem Sales Co Montgomery, AL. (833) 212-9276 IBC Technologies Inc. 8015 North Fraser Way Burnaby, BC Canada V5J 5M8 (844) HEAT-IBC / (844) 432-8422 IBC Technologies USA Inc. 121 Walter A Gaines Way Lawnside, NJ 08045 (856) 887-0544 April 2022 ©...

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