Rheem 80MDV SERIES Installation Instructions Manual
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Rheem 80MDV SERIES Installation Instructions Manual

Upflow/horizontal two stage, communicating gas furnaces w/ecm blower
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INSTALLATION INSTRUCTIONS

FOR UPFLOW/HORIZONTAL TWO STAGE, COMMUNICATING
GAS FURNACES W/ECM BLOWER
(-)802V
UPFLOW/HORIZONTAL SERIES
(-)(-)80MDV UPFLOW/HORIZONTAL SERIES
ISO 9001:2008
ST-A1220-01-X0
U.L. and/or C.S.A. recognized fuel gas and CO (carbon monoxide) detectors are rec-
ommended in all applications, and their installation should be in accordance with the
manufacturer's recommendations and/or local laws, rules, regulations, or customs.
92-24161-148-03
SUPERSEDES 92-24161-148-02

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  • Page 1: Installation Instructions

    INSTALLATION INSTRUCTIONS FOR UPFLOW/HORIZONTAL TWO STAGE, COMMUNICATING GAS FURNACES W/ECM BLOWER (-)802V UPFLOW/HORIZONTAL SERIES (-)(-)80MDV UPFLOW/HORIZONTAL SERIES ST-A1220-01-X0 U.L. and/or C.S.A. recognized fuel gas and CO (carbon monoxide) detectors are rec- ommended in all applications, and their installation should be in accordance with the manufacturer’s recommendations and/or local laws, rules, regulations, or customs.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 1 TABLE OF CONTENTS..... . . 2 11 HIGH ALTITUDE ......32 Natural Gas at High Altitudes .

  • Page 3: General Information

    GENERAL INFORMATION NOTE: A heat loss calculation should be performed to properly The (-)802V/(-)(-)MDV series furnaces are design certified by CSA determine the required furnace BTU size for the structure. Also, for use with natural and propane gases as follows: the duct must be properly designed and installed for proper air- As a Category I furnace, it may be vented vertically with type B- flow.

  • Page 4: Receiving

    GENERAL INFORMATION (cont.) CALIFORNIA RESIDENTS ONLY Install this furnace in accordance with the American National Stan- dard Z223.1 – latest edition entitled “National Fuel Gas Code” IMPORTANT: All manufacturer products meet current Federal (NFPA54) or codes of the local utilities or other authorities having OSHA Guidelines for safety.

  • Page 5: Checklist

    Installation Instructions remain with the furnace as a reference guide to the servicing contractor. We recommend that performance and installation data be recorded for future reference on this sheet to meet service and warranty obligations so that job site information is available when required. Installation Checklist REFER TO INSTALLATION INSTRUCTIONS GAS SUPPLY...

  • Page 6: Safety Information

    SAFETY INFORMATION WARNING WARNING DO NOT INSTALL THIS FURNACE IN A MOBILE HOME!! COMBUSTION AND VENTILATION AIR MUST BE PRO- THIS FURNACE IS NOT APPROVED FOR INSTALLATION VIDED TO THE FURNACE AS REQUIRED BY THE NA- IN A MOBILE HOME. DOING SO COULD CAUSE FIRE, TIONAL FUEL-GAS CODE (U.S.) AND THE COMBUSTION PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

  • Page 7: Important Information About Efficiency And Quality

    SAFETY WARNING WARNING BLOWER AND BURNERS MUST NEVER BE OPERATED DUCT LEAKS CAN CREATE AN UNBALANCED SYSTEM WITHOUT THE BLOWER DOOR IN PLACE. THIS IS TO AND DRAW POLLUTANTS SUCH AS DIRT, DUST, FUMES PREVENT DRAWING GAS FUMES (WHICH COULD CON- AND ODORS INTO THE HOME CAUSING PROPERTY TAIN HAZARDOUS CARBON MONOXIDE) INTO THE DAMAGE.

  • Page 8: Location Requirements

    LOCATION REQUIREMENTS GENERAL INFORMATION WARNING WARNING WHEN THIS FURNACE IS INSTALLED IN A RESIDENTIAL THIS FURNACE IS NOT APPROVED OR RECOMMENDED GARAGE, IT MUST BE INSTALLED SO THE BURNERS FOR INSTALLATION ON ITS BACK, WITH ACCESS DOORS AND IGNITION SOURCE ARE LOCATED NO LESS THAN FACING UPWARDS.
  • Page 9 LOCATION REQUIREMENTS GENERAL INFORMATION (cont.) WARNING WARNING UPFLOW AND HORIZONTAL FURNACES ARE DESIGN- COMBUSTIBLE MATERIAL MUST NOT BE PLACED ON CERTIFIED FOR INSTALLATION ON COMBUSTIBLE OR AGAINST THE FURNACE JACKET. THE AREA FLOORS. NOTE, HOWEVER, THAT FURNACES MUST NOT AROUND THE FURNACE MUST BE KEPT CLEAR AND BE INSTALLED DIRECTLY ON CARPETING, TILE OR FREE OF ALL COMBUSTIBLE MATERIALS INCLUDING OTHER COMBUSTIBLE MATERIAL OTHER THAN WOOD...

  • Page 10: Dimensions And Clearance Table

    FIGURE 4 UPFLOW/HORIZONTAL DIMENSIONS...

  • Page 11: Ducting

    DUCTING UPFLOW INSTALLATIONS Proper air flow is required for the correct operation of this furnace. Restricted air flow can cause erratic operation and 1. Position the unit to minimize long runs of duct or runs can damage the heat exchanger. The duct system must of duct with many turns and elbows.
  • Page 12 DUCTING FIGURE 5 NOTE: SOLID BASE PLATE PROVIDED WITH (-)801P MODELS ONLY. WHEN SOLID BASE PLATE IS USED . TAPE AROUND BOTTOM FLANGES OF CABINET BEFORE THE UNIT IS INSTALLED. SOLID BASE FLANGE FITS UNDER CABINET BOTTOM LIFT UP, PULL OUT 1.

  • Page 13: Horizontal Units

    DUCTING HORIZONTAL UNITS FIGURE 9 HORIZONTAL RETURN AIR DUCT 1. Position the unit to minimize long runs of duct or runs of (LEFT-HAND AIRFLOW POSITION SHOWN) duct with many turns and elbows. 2. Unit can be mounted left or right side airflow configuration. 3.

  • Page 14: Combustion And Ventilation Air

    COMBUSTION AND VENTILATION AIR COMBUSTION AIR REQUIREMENTS • Halogen type refrigerants IMPORTANT: This is not a direct vent furnace. Review venting • Cleaning solvents (such as perchloroethylene) instructions before installing. • Printing inks, paint removers, varnishes, etc. • Hydrochloric acid WARNING •...

  • Page 15: Furnace Located In An Unconfined Space

    COMBUSTION AND VENTILATION AIR (cont.) COMBUSTION AIR REQUIREMENTS: CONFINED AND UNCONFINED SPACES FURNACE LOCATED IN A CONFINED SPACE ALL FURNACE INSTALLATIONS MUST COMPLY WITH A confined space is defined as any space for a given furnace input THE NATIONAL FUEL GAS CODE, NFPA 54 AND LOCAL rating which is smaller than that which is specified in Table 1 as CODES TO PROVIDE ADEQUATE COMBUSTION AND minimum for an “unconfined”...
  • Page 16 COMBUSTION AND VENTILATION AIR (cont.) COMBUSTION AIR REQUIREMENTS: CONFINED AND UNCONFINED SPACES TABLE 9 : MINIMUM FREE AREA REQUIRED TABLE 3: MINIMUM FREE AREA REQUIRED TABLE 5: MINIMUM FREE AREA REQUIRED TABLE 1 1: MINIMUM FREE AREA REQUIRED FOR EACH OPENING (WHEN TWO OPENINGS FOR EACH OPENING (WHEN TWO OPENINGS FOR EACH OPENING (WHEN TWO OPENINGS FOR AN OPENING (WHEN O N E OPENING IS...
  • Page 17 COMBUSTION AND VENTILATION AIR (cont.) COMBUSTION AIR REQUIREMENTS: CONFINED AND UNCONFINED SPACES FIGURE 12 FIGURE 11 VENT PENETRATIONS VENT PENETRATIONS NON-DIRECT VENT FOR NON DIRECT VENT FURNACES NON-DIRECT VENT FOR NON DIRECT VENT FURNACES AIR FROM ATTIC CRAWL SPACE OUTSIDE AIR AIR FROM ATTIC CRAWL SPACE AIR FROM ATTIC...

  • Page 18: Combustion Air From Attic

    COMBUSTION AND VENTILATION AIR (cont.) It is also acceptable to run the condensate drain (or refriger- CAUTION ant) line access over the air intake hole as long as a 1" mini- mum clearance is maintained. COMBUSTION AIR INTAKES CANNOT BE TERMINATED Combustion air openings must not be restricted in any manner.

  • Page 19: Venting

    COMBUSTION AND VENTILATION AIR (cont.) VENTING GENERAL INFORMATION IMPORTANT APPLICATION NOTES When the furnace is used as a replacement, the existing vent The furnace must be vented in accordance with these instructions, system should be inspected to assure that there are no obstruc- National Fuel Gas Code, ANSI Z223.1 and requirements or codes tions, blockage, or any signs of corrosion and is properly sized for of the local utility or other authority having jurisdiction.

  • Page 20: Special Vent Systems (Svs)

    COMBUSTION AND VENTILATION AIR (cont.) VERTICAL VENT SYSTEMS: Single appliance venting of a fan assisted furnace into a tile-lined 1. A gas vent shall terminate above the roof surface with a listed masonry chimney is prohibited. The chimney must be lined with cap or listed roof assembly.
  • Page 21 COMBUSTION AND VENTILATION AIR (cont.) FIGURE 17 1. STANDARD 3” FLUE CONNECTION. 2. 4” ADAPTER - OPTIONAL SEE NATIONAL FUEL GAS CODE FOR SIZING OPTIONS FRESH AIR INLET ST-A1220-09-01 ST-A1220-09 FIGURE 18 DEDICATED VENTING THROUGH CHIMNEY WITH “B-1” VENT...

  • Page 22: Power Vent Systems

    COMBUSTION AND VENTILATION AIR (cont.) POWER VENT SYSTEMS 1. Visually inspect the venting system for proper size and hori- zontal pitch and determine that there is no blockage, restric- When vertical venting is not possible, the only acceptable method tion, leakage, corrosion or other deficiencies which could for horizontal venting is with the use of Tjernlund model GPAK- cause an unsafe condition.

  • Page 23: Gas Supply And Piping

    GAS SUPPLY GAS SUPPLY AND PIPING IMPORTANT SAFETY INFORMATION AND WILL RISE, POSSIBLY ACCUMULATING IN HIGHER PORTIONS OF THE STRUCTURE. NATURAL GAS AND PROPANE • IF A GAS LEAK IS PRESENT OR SUSPECTED: (LIQUEFIED PETROLEUM GAS / LPG) - DO NOT ATTEMPT TO FIND THE CAUSE YOUR- SAFETY SELF.

  • Page 24: Gas Piping

    GAS SUPPLY GAS PIPING IMPORTANT: When making gas pipe connections, use a back-up wrench to prevent any twisting of the control assembly and gas valve. Do not overtighten the connection. THIS FURNACE IS EQUIPPED AT THE FACTORY Any strains on the gas valve can change the position of the gas FOR USE ON NATURAL GAS ONLY.

  • Page 25: Gas Pressure

    GAS SUPPLY (cont.) GAS PRESSURE IMPORTANT: ENSURE that the furnace gas valve is not to be subjected to high gas line supply pressures. FIGURE 20 TYPICAL GAS VALVE (WHITE RODGERS) DISCONNECT the furnace and its individual manual gas stop OUTLET PRESSURE TAP from the gas supply piping during any pressure testing that ex- HIGH-FIRE ceeds 1/2 PSIG.

  • Page 26: Setting Gas Pressure

    GAS SUPPLY (cont.) GAS PRESSURE SETTING GAS PRESSURE The maximum gas supply pressure to the furnace ELEVATIONS ABOVE 2000 FT. REQUIRE THAT THE must not exceed 10.5" w.c. natural gas, or 13" w.c. LP FURNACE INPUT RATING BE ADJUSTED AND THAT gas.

  • Page 27: Lp Conversion

    LP CONVERSION LP TANKS FROM LOCAL LP SUPPLIER MUST NOT BE USED TO STORE ANYTHING (SUCH AS FERTIL- IZER) EXCEPT LP GAS. THIS INCLUDES ALL DELIV- ERY VESSELS (LP TRUCKS). IF MATERIAL OTHER THAN LP GAS IS USED IN THE SAME VESSELS/TANK AS THE LP GAS, THE LP GAS CAN BECOME CONTAMINATED AND DAMAGE THE FUR- NACE.

  • Page 28: Electrical Wiring

    ELECTRICAL WIRING ELECTRICAL WIRING These may be obtained from: National Fire Protection Association, Inc. Batterymarch Park TURN OFF ELECTRIC POWER AT FUSE BOX OR Quincy, MA 02269 SERVICE PANEL BEFORE MAKING ANY ELECTRI- CAL CONNECTIONS. FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK RESULTING IN PER- FIGURE 22 SONAL INJURY OR DEATH.

  • Page 29: Thermostat

    ELECTRICAL WIRING REVERSING ELECTRICAL CONNECTION & THERMOSTAT 7. Using a flat screwdriver, squeeze the retaining arms on the NOTE: Do not use 24 volt control wiring smaller than No. door switch and gently pry the door switch from it’s opening. 18 AWG.

  • Page 30: Accessories

    ACCESSORIES ELECTRONIC AIR CLEANER It is recommended to replace the furnace filter periodically to maintain optimum furnace performance. Line voltage power can be supplied from the terminal labeled “EAC” and a line voltage neutral terminal on the control board. RXGW-B01 CHIMNEY ADAPTER This will power the electronic air cleaner whenever the circulating air blower is in operation.

  • Page 31: Figure 26

    FIGURE 26 FILTER LOCATIONS FLANGE WRAPS AROUND BACK AND SCREWS TO THE REAR OF THE FURNCE, AT THE LOCATIONS PROVIDED CUT OUT USING EMBOSSED ANGLES AS A GUIDE FOR PROPER SIZE 23” X 14” FIELD SUPPLIED FILTER RXGF-CD ACCESSORY FILTER RACK ST-A1220-07-X0 ST-A1220-07-00 SIDE RETURN...

  • Page 32: High Altitude

    HIGH ALTITUDE NATURAL GAS AT HIGH ALTITUDES From Table F.1 of National Fuel Gas Code Handbook, 2002 (3.5 WARNING w.c. column). Orifice required at Sea Level: #40 INSTALLATION OF THIS FURNACE AT ALTITUDES ABOVE 2000 FT (610 m) SHALL BE IN ACCORDANCE WITH From Table F.4 of National Fuel Gas Code Handbook, Orifice re- quired at 5000 ft.
  • Page 33 TABLE 8 SUPPLEMENTAL ORIFICE SIZE CHART NATURAL GAS ORIFICE SELECTION BASED ON HEATING VALUE & ELEVATION* Notes: 1. All (-)80+ units are factory equiped with orifices sized for 1050 sea level heating value gas. 2. Installer must be aware of the local heating value (sea level standard) to use the chart below. 3.

  • Page 34: Lp Gas At High Altitudes

    LP GAS (TABLE 9) based on an 11" of water column pressure at the orifice, which dif- fers from products that use 10" of water column at the orifice. This NOTE: Keep any parts removed during LP conversion procedure difference requires a deviation from the NFGC orifice size recom- stored with the product literature for future use.

  • Page 35: Startup Procedures

    START-UP PROCEDURES This furnace is equipped with a direct ignition control. Each time the room thermostat calls for heat, the ignitor lights the main burners directly. See the lighting instructions on the furnace. SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, CLOSE THE MANUAL GAS VALVE TO START THE FURNACE FOR THE APPLIANCE BEFORE SHUTTING OFF THE...

  • Page 36: Integrated Furnace Control

    FIGURE 27 R80V TWO-STAGE COMMUNICATING FURNACE CONTROL LAYOUT...

  • Page 37: Humidification/Dehumidification

    1. P1 (4-Pin), P2 (7-Pin) and P5 (5-Pin) - Low-Voltage For ½ HP motors - Electronic air cleaner is energized any time the blower is above 500 CFM Internal Wiring Connections – Connect main twist- lock wire harness to these connections. Pre-wired For ¾...
  • Page 38 A2-2 CONTROLLED HUMIDIFIER OPERA- An optional 24VAC humidistat can be installed as shown in Figures 29 thru 32. With the optional humidi- TION USING A HUMIDISTAT (REQUIRES stat, two separate conditions must be met before hu- OPTIONAL HUMIDISTAT). midification can begin 1). There must be a call for heat Controlled humidification can be accom- and the blower must be engaged and 2.) The humidis- plished using a humidistat as shown in Fig-...
  • Page 39 C2. WITH NON-COMMUNICATING THERMO- Figures 30 or 31. These figures show installa- tion of a humidifier with external and internal STAT (REQUIRES OPTIONAL HUMIDISTAT) power supplies respectively. Dehumidification For non-communicating thermostats, an op- operation will be disabled if the dipswitch S2-8 tional humidistat must be installed.

  • Page 40: Dipswitches

    FIGURE 31 WIRING FOR OPTIONAL DE-HUMIDIFICATION AND HUMIDIFICATION WITH OPTIONAL HUMIDIFIER (HUMIDIFIER WITH INTERNAL POWER SUPPLY). NOTE: FOR USE WITH NON-COMMUNICATING SYSTEMS. ST-A1194-57-00 FIGURE 32 HUMIDISTAT USED TO CONTROL DEHUMIDIFICATION IN COOLING ONLY (NO HUMIDIFIER) NOTE: FOR USE WITH NON-COMMUNICATING THERMOSTATS. ST-A1194-58-00 11.
  • Page 41 FIGURE 33 DIPSWITCH MAP...
  • Page 42 ½ HP Blower 2. For communicating systems, dipswitches are not used. Configuration changes are made with the S1-4 S1-5 50 + 75 BTU ¾ HP Blower (17” Cabinet) R802VA075417 100 + 125 thermostat. A. Seven-Segment Display Orientation; S1-1 900 CFM 1200 CFM 1500 CFM (Factory Setting)
  • Page 43 Low Cool % of 2 S3-13 S3-14 Target Temperature Rise S2-9 Stage Cooling Airflow Nominal Value Specified on Rating Label (Factory Setting) (Approx.) Approx. +7°F OFF is Factory Setting Do not use G. Auto Stage; S2-10 & S2-11 Approx. +12°F There are applications where a single stage ther- mostat is used with the two stage furnace.

  • Page 44: Model Data Card

    14. DUAL SEVEN-SEGMENT DISPLAY AND FAULT 13. MODEL DATA CARD CONNECTOR (P6) CODES (U38) There is a factory-installed model data card which is wire-tied to the furnace. At no time should this card be NOTE: Verify display orientation is correct before in- removed from the furnace except during replacement terpreting fault codes.

  • Page 45: Dual Seven-Segment Display

    3. When the furnace is in a heat or cool blower off 5. When the high pressure switch is open and the de- elay, the display should be “0”. mand from the thermostat is set to 100% heat. . . In this case the operation code “...
  • Page 46 The fault and mode codes and fault priorities are listed below. Priority is to be used to determine which fault to display when two or more faults are present simultaneously. NOTE: Verify display orien- tation is correct be- Circuit Open P41-P42 (should be filtered) fore interpreting fault codes.

  • Page 47: Pushbutton

    15. PUSHBUTTON (S8) stamp will also be updated. This way, the existing fault will be updated but a new fault will not be added. The status mode is entered when the pushbutton is pressed for less than 2 seconds. While in the Status Faults older than 168 powered hours will be automatically menu at the seven segment displays, the category deleted from the fault buffer.
  • Page 48 Clearing Fault History Extended Display Mode The fault buffer can be cleared with the pushbutton while If the pushbutton is pressed during the power-up se- the Fault History Display (FL) menu is active by holding quence, IFC will turn on the extended display mode. The down the pushbutton for 5 seconds or more.

  • Page 49: Supply & Outdoor Air Temperature Sensors

    16. SUPPLY AND OUTDOOR AIR TEMPERATURE the same power cycle, a fault “82” is to be displayed SENSOR INPUTS (T4) on the seven segment displays. Optional field installed supply air SA1, SA2 outdoor air If the resistance between the outdoor air terminals sensors (10K NTC thermistor) shall be read from the (OAT) is determined to be out of range to a high re- T4 screw terminal block.

  • Page 50: Auxiliary Inputs

    17. AUXILIARY INPUTS (COMMUNICATING SYSTEMS thermostat as either normally-opened or normally ONLY) (T5) (SEE FIGURE 35) closed contacts. System operation when the contacts either open or close can be configured at the commu- Terminal T5 is porovided for field installation of up to nicating thermostat.

  • Page 51: Thermostat Wiring Diagrams

    18. THERMOSTAT INPUTS (T2) – THERMOSTAT 2. *Wire gage smaller than 18 AWG is not approved or WIRING DIAGRAMS recommended for this application. Both communicating and legacy thermostats are to be 3. If the thermostat wiring will be located near or in paral- connected at terminal block T2.
  • Page 52 Figure 36 is the wiring diagram for connecting the furnace Note: The only approved configuration requires that four to an approved EcoNet communicating thermostat and ap- dedicated wires (E1,E 2, R and C) be installed from the proved EcoNet communicating condenser. The only ap- furnace to the condenser.

  • Page 53: Legacy Ac Condensing (Non-Communicating)

    C. SYSTEMS WITH LEGACY (NON-COMMUNICAT- ING) THERMOSTATS C1. WIRING OF A 1-STAGE LEGACY THERMO- C2. WIRING OF A 2-STAGE LEGACY THERMO- STAT WITH AUTOSTAGING SELECTED STAT (SEE FIGURE 39) (SEE FIGURE 38). FIGURE 38 WIRING DIAGRAM FOR A LEGACY SINGLE-STAGE THERMOSTAT WITH AUTOSTAGING. SINGLE-STAGE TWO-STAGE / MODULATING CONDENSER...
  • Page 54 FIGURE 39 WIRING DIAGRAM FOR A LEGACY TWO-STAGE THERMOSTAT. TWO-STAGE TWO-STAGE / MODULATING CONDENSER THERMOSTAT GAS FURNACE CONTROL UNIT (NON-COMMUNICATING) HUM STAT ST-A1194-62-04...

  • Page 55: Legacy Heat Pump (Non-Communicating)

    D. SPECIAL CONFIGURATION – WIRING OF NON- COMMUNICATING HEAT-PUMPS WITH COMMUNICATING FURNACE AND THERMOSTAT (SEE FIGURE 40). FIGURE 40 WIRING DIAGRAM FOR NON-COMMUNICATING HEAT PUMPS WITH COMMUNICATING FURNACE AND THERMOSTAT A. WIRING DIAGRAM SPECIAL CONFIGURATION: COMMUNICATING THERMOSTAT AND FURNACE WITH NON-COMMUNICATING HEAT PUMP (SINGLE - STAGE ONLY) 125 FEET MAX.
  • Page 56 INTEGRATED FURNACE CONTROL THERMOSTAT WIRING DIAGRAMS-CONDENSING UNIT (NON-COMMUNICATING E. HEAT PUMP SYSTEMS W/LEGACY THERMOSTATS E1. WIRING OF A SINGLE-STAGE LEGACY E2. WIRING OF A TWO-STAGE LEGACY THERMO- THERMOSTAT WITH AUTOSTAGING SELECTED STAT (SEE FIGURE 42) (SEE FIGURE 41). FIGURE 41 WIRING DIAGRAM FOR A LEGACY SINGLE-STAGE THERMOSTAT WITH AUTOSTAGING.
  • Page 57 FIGURE 42 WIRING DIAGRAM FOR A LEGACY 2-STAGE THERMOSTAT TWO-STAGE / MODULATING GAS FURNACE CONTROL HUM STAT ST-A1194-93-01 19. 24VAC AND COMMON CONNECTIONS (E10/E11) 20. FUSE (P100/P101) For connection to the low voltage side of the control A fuse is provided to protect low-voltage (24VAC) transformer.

  • Page 58: Timing Diagram, Field Selections & Adjustments

    TABLE 10 TIMING DIAGRAM NOT MONITORED DURING LOW INDUCER SPD/LOW HT The maximum gas supply pressure to the furnace should To change orifice spuds, shut off the manual gas valve and be 10.5" w.c. for natural gas and 13.0" w.c. for L.P. The remove the gas manifold.

  • Page 59: Setting Input Rate

    TABLE 11 METER TIME                     "  #         ...

  • Page 60: Airflow

    FIGURE 44 nace as possible. TYPICAL FURNACE NAME PLATE 3. Operate the furnace. RHEEM SALES COMPANY, INC. 4. When the thermometer in the supply air duct stops rising (ap- FORT SMITH, ARKANSAS proximately five minutes), subtract the return air temperature ENERGY from the supply air temperature.

  • Page 61: Limit Control

    SAFETY FEATURES LIMIT CONTROL/HALC PRESSURE SWITCH The high limit cut-off temperature is set at the factory and cannot This furnace is equipped with a normally-open pressure switches be adjusted. The temperature setting prevents the air tempera- that monitors pressure conditions within the furnace vent system ture leaving the furnace from exceeding the maximum outlet air during the heating cycle.

  • Page 62: Maintenance

    MAINTENANCE MAINTENANCE THESE INSTRUCTIONS ARE INTENDED AS AN AID TO FIRE, ELECTRICAL SHOCK, CARBON MONOXIDE POI- QUALIFIED SERVICE PERSONNEL FOR PROPER IN- SONING, EXPLOSION, PROPERTY DAMAGE, PERSONAL STALLATION, ADJUSTMENT AND OPERATION OF THIS INJURY OR DEATH. UNIT. READ THESE INSTRUCTIONS THOROUGHLY BE- DISCONNECT MAIN ELECTRICAL POWER TO THE FORE ATTEMPTING INSTALLATION OR OPERATION.

  • Page 63: Maintenance

    ADVISE THE CUSTOMER 5. Do not permit the heat generated by television, lamps or other heat generating devices to influence the ther- 1. Keep the air filters clean. The heating system will oper- mostat operation. ate better, more efficiently and more economically. 6.

  • Page 64: Diagnostics

    Below are two lists; a list of normal operating codes and a NOTE: Verify display orientation is correct before interpret- list of fault codes. The fault code list provides diagnostic ing fault codes. Otherwise, the fault codes may be upside- and troubleshooting information to help determine the down.

  • Page 65: 802V Fault Codes With Descriptions And Solutions

    TABLE 13 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS FAULT CODES DISPLAYED TEXT STATUS FAULT CODE DISPLAYED DESCRIPTION AT DUAL SEVEN- EXPECTED OPERATION SEGMENT DISPLAY OF CAUSE CONTROL SOLUTION FAULT CODES NO MODEL DATA STATUS: This is a critical fault. The furnace will not operate in any mode. DESCRIPTION: This code is displayed anytime there is no model data at the furnace or (for communicating systems only) on the network (e.g.
  • Page 66 TABLE 13 (continued) 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS ONE-HOUR LOCKOUT STATUS: This is a critical fault. The furnace will not operate in gas heat modes but all other modes (e.g. cooling) should function. DESCRIPTION: This fault is displayed under the following conditions: 1.
  • Page 67 TABLE 13 (continued) 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS LOW FLAME SENSE STATUS: The status of this fault is non-critical and furnace operation will continue as normal in heating (and all other) mode(s). If flame sense is low, the furnace control (or I.F.C.) may soon no longer be able to properly sense the flame and status of the problem may be elevated to the level of fault code "13"...
  • Page 68 TABLE 13 (continued) 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS...
  • Page 69 TABLE 13 (continued) 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS OPEN FUSE STATUS: This is a critical fault. The furnace will not operate in any mode. DESCRIPTION: The fuse has been opened. This usually occurs when there is a 24VAC short to common or ground on the low- votage side of the transformer.
  • Page 70 TABLE 13 (continued) 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS LOW PRESSURE SWITCH OPEN, INDUCER ON HIGH SPEED STATUS: This is a critical fault. The furnace will not operate in gas heat modes but all other modes (e.g. cooling) should function if present simultaneously with a heating call (e.g.
  • Page 71 TABLE 13 (continued) 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS HIGH PRESSURE SWITCH CLOSED, INDUCER OFF STATUS: This is a critical fault. The furnace will not operate in gas heat modes but all other modes (e.g. cooling) should function if present simultaneously with a heating call (e.g. defrost call in dual-fuel mode). DESCRIPTION: The high pressure control (or switch) should not be closed when the inducer is not running.
  • Page 72 TABLE 13 (continued) 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS BLOWER FAULT - BLOWER CAN STILL RUN STATUS: This is a non-critical fault experienced by the furnace. All operations (including thermostat calls) should continue as normal with no perceivable difference in operation. DESCRIPTION: A blower fault which is non-critical allows the blower to continue to run but at less-than-optimal conditions.
  • Page 73 TABLE 13 (continued) 802V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS BLOWER CUTBACK STATUS: This is a non-critical fault experienced by the furnace. All operations (including thermostat calls) should continue as normal with no perceivable difference in operation. DESCRIPTION: The blower motor is operating at the highest rpm or torque that specifications allow but the application requires more torque or speed in order to get the desired airflow under the current static pressure conditions.

  • Page 74: Lockout

    the inducer . Fault code “ 93 ” is set and displayed. This All lockout conditions can be cleared immediately provided that the original fault causing the lockout is cleared and lockout condition cannot be reset by cycling the heat call. power to the unit is cycled off and then back on again or 3.
  • Page 75 1. MOTOR POWER AND COMMUNICATIONS IS- B. Remove the motor control connector from the fur- SUES (FAULT CODE “68”) nace control at P5 and apply 24VAC to pins 3 & 4 (see photo). With the door switch closed (motor Is the motor communicating properly with the furnace powered) and 24VAC on pins 3 &...
  • Page 76 B. Is the motor set-screw not tightened to the motor shaft? This may cause erratic motor operation and cause the furnace to display a “66” fault code. Further, airflow will be low or air may not be mov- ing at all. >...

  • Page 77: Diagnosis Flowchart

    FIGURE 47 DIAGNOSTICS FLOWCHART 2-STAGE COMMUNICATING INTEGRATED FURNACE CONTROL (IFC) ECM = Constant CFM Blowers. (Electronically commutated motor) TSTAT = Thermostat. DIAGNOSTIC CHART IDM = Induced Draft Motor (or Inducer). IFC = Integrated Furnace Control (or control board). PS = Pressure Switch(es). PFC = Power Factor Correction Choke.
  • Page 78 FIGURE 47 (cont.) DIAGNOSTICS FLOWCHART - Check wire and all connections between I.F.C.and I.D.M - Check for 115 VAC on P3-1 & P3-3. PROBLEM PERSISTS After Blower on delay, Does IDM switch to High speed - Check I.D.M. capacitor. and remain at low speed after switching? - Check I.D.M.

  • Page 79: Wiring Diagram

    FIGURE 48 FOR MODELS WITH UT ELECTRONIC CONTROLS 1028-928 INTEGRATED FURNACE CONTROL AND DIRECT SPARK IGNITION DISC...
  • Page 80 CM 0616...

This manual is also suitable for:

802v series

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