Page 3 - Table of Contents
3 Table of Contents C IRCULATION A IR F ILTERS ................................................................................................................... 23 H ORIZONTAL I NSTALLATIONS ..............................................................................................................
Page 5 - III; Keep this literature in a safe place for future reference.
5 P RODUCT A PPLICATION T O PREVENT PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION , THIS FURNACE MUST BE C ATEGORY I VENTED . D O NOT VENT USING C ATEGORY III VENTING . P ROVISIONS MUST BE MADE FOR VENTING COMBUSTION PRODUCTS OUTDOORS THRO...
Page 6 - EATURES; must
6 L OCATION R EQUIREMENTS AND C ONSIDERATIONS • It must be installed per the installation instructionsprovided and per local and national codes. • It must be installed indoors in a building constructedon site. • It must be part of a ducted system and not used in afree air delivery application. • It ...
Page 7 - National Fire Protection Association, Inc.; Combustion and Ventilation Air Requirements.
7 L OCATION R EQUIREMENTS AND C ONSIDERATIONS To ensure proper furnace operation, install, operate andmaintain the furnace in accordance with these installa-tion and operation instructions, all local building codesand ordinances. In their absence, follow the latest edition of the National Fuel Gas C...
Page 8 - Side; completely; hydrochloric acid; NOTE
8 L OCATION R EQUIREMENTS AND C ONSIDERATIONS Top - 1" Side Clearance - 1" Back - 0" Front Clearance - 3" Vent Pipe Clearance to Combustibles-6" using Single Wall Connector or 1"using B-1 vent. • Adequate combustion/ventilation air must be suppliedto the closet. • Furnace mus...
Page 9 - I V; WARNING
9 C OMBUSTION & V ENTILATION C ATEGORY I V ENTING A IR R EQUIREMENTS Suspended Furnace E XISTING F URNACE R EMOVAL NOTE: When an existing furnace is removed from a venting system serving other appliances, the venting system may be too large to properly vent the remaining attached appliances. The...
Page 10 - When an existing furnace is re-
10 E XTERIOR MASONRY C HIMNEYS - C ATEGORY I F URNACES O NLY heating/cooling costs but have created a problem supplyingcombustion and ventilation air for gas fired and other fuel burn-ing appliances. Appliances that pull air out of the house (clothesdryers, exhaust fans, fireplaces, etc.) increase t...
Page 11 - Counterflow units; I F; AFUE; Typical Multiple Flue Clay Tile Chimney
11 E XTERIOR MASONRY C HIMNEYS - C ATEGORY I F URNACES O NLY 11. Reconnect the induced draft blower power leads. NOTE: If the wires are not long enough, pull extra wire from thewire bundle in the blower compartment. 12. Reconnect the flue pipe, and the pressure switch tubing. Ensure that all wires a...
Page 14 - Relining options include B vent and flexible liners.
14 E LECTRICAL C ONNECTIONS F IX 3 - R EBUILD THE C ROWN If the chimney crown is damaged, a qualified mason must re-pair it in accordance with nationally recognized building codesor standards. One such standard which may be referenced isthe Standard for Chimneys, Fireplaces, Vents, and Solid FuelBur...
Page 15 - It is required by the liner manufacturer’s instructions.; LECTRICAL; HIGH; HIGH; IRING; Wire routing must not to interfere with circulator blower
15 E LECTRICAL C ONNECTIONS and in the National Standard of Canada, CAN/CSA B149.1 andCAN/CSA B149.2 - latest editions and amendments. To install the liner, read and follow the liner manufacturer’s in-structions and your local codes. Excess liner length should bepulled out of the chimney and cut off...
Page 17 - Thermostat Wiring Diagrams; timed
17 E LECTRICAL C ONNECTIONS R Y C NEU Furnace Integrated Control Module Remote Condensing Unit (Single-Stage Cooling) Dehumidistat [Optional] To apply a single-stage Heating Thermostat, the thermostat selector switch on the Integrated Control Module be set on single-stage. must NOTE: Single Stage He...
Page 18 - The accessory load specifications are as follows:; Humidifier; Accessories Wiring; CAUTION; Natural Gas; Adjusting the minimum supply pressure below the limits
18 G AS S UPPLY AND P IPING A heat pump thermostat with three stages of heat is required to properly use a two-stage furnace in conjunction with a heatpump. Refer to the fossil fuel kit installation instructions foradditional thermostat requirements. Strictly follow the wiring guidelines in the foss...
Page 19 - The furnace will naturally derate itself with; The following stipulations apply when connecting gas piping.
19 C IRCULATING A IR AND F ILTERS air temperature rise must be within the range listed on the fur-nace nameplate. Should this appliance be converted to LP,refer to the instructions included in the factory authorized LPconversion kit. H IGH A LTITUDE D ERATE IMPORTANT NOTE: The furnace will naturally...
Page 20 - General Furnace Layout
20 G AS S UPPLY AND P IPING • Install a manual shutoff valve between the gas meterand unit within six feet of the unit. If a union is installed,the union must be downstream of the manual shutoffvalve, between the shutoff valve and the furnace. • Tighten all joints securely. • Connect the furnace to ...
Page 22 - Ductwork must never be; Checking Static Pressure
22 S TART - UP P ROCEDURE AND A DJUSTMENT A closed return duct system must be used, with the return ductconnected to the furnace. NOTE: Ductwork must never be attached to the back of the furnace. For installations requiringmore than 1800 CFM, use a bottom return or two sided return.Supply and return...
Page 23 - Operational Checks
23 S TART - UP P ROCEDURE AND A DJUSTMENT ply with UL900 or CAN/ULCS111 standards. If the furnace isinstalled without filters, the warranty will be voided. NOTE: An undersized opening will cause reduced airflow. The bottom return is set up as a knock out. U PRIGHT I NSTALLATIONS Depending on the ins...
Page 24 - Selector Switch; White-Rodgers Model 36G54 Connected to Manometer; Inlet Gas Supply Pressure
24 S TART - UP P ROCEDURE AND A DJUSTMENT INLET OUTLET Gas Valve On/Off Selector Switch White-Rodgers Model 36G54 (Two-Stage) Inlet Pressure Boss Low Fire Regulator Adjust Manometer Manometer Hose High Fire Regulator Adjust Regulator Vent Outlet Pressure Boss Open to Atmosphere On/Off Switch High Fi...
Page 25 - Manifold Gas; Natural
25 S TART - UP P ROCEDURE AND A DJUSTMENT Gas Line GasShutoff Valve Gas Line To Furnace Drip Leg Cap With Fitting Manometer Hose Manometer Open ToAtmosphere Measuring Inlet Gas Pressure (Alt. Method) G AS M ANIFOLD P RESSURE M EASUREMENT AND A DJUSTMENT T O PREVENT UNRELIABLE OPERATION OR ...
Page 26 - EMPERATURE; Startup Procedure and Adjustment -Circulator; Temperature Rise Measurement; IRCULATOR; OFF
26 S TART - UP P ROCEDURE AND A DJUSTMENT 4. Calculate the furnace input in BTUs per hour (BTU/hr). Input equals the sum of the installation’s gas heatingvalue and a conversion factor (hours to seconds) dividedby the number of seconds per cubic foot. The measuredinput must not be greater than the in...
Page 27 - Profile A; Profile D
27 S TART - UP P ROCEDURE AND A DJUSTMENT The cooling system manufacturer’s instructions must bechecked for required air flow. Any electronic air cleaners orother devices may require specific air flows, consult installa-tion instructions of those devices for requirements. 3. Knowing the furnace mode...
Page 28 - Select the heating speed for your model from the heating; LOWER; Heat Off Delay Dipswitches; Mo del Tap L ow Stage High Stage L ow Stage High Stage; Speed Selection Dip Switches
28 S TART - UP P ROCEDURE AND A DJUSTMENT 7. Select the heating speed for your model from the heating speed chart in the Specification Sheet. The adjust setting(already established by the cooling speed selection)determines which set of speeds are available. Theselected speed must provide a temperatu...
Page 29 - COMFORTNETTM SYSTEM; OMFORT; see Electrical Connections
29 COMFORTNET™ SYSTEM ECM motor. If the outdoor unit or thermostat is responsiblefor determining the demand, it calculates the demand andtransmits the demand along with a fan request to the indoorunit. The indoor unit then sends the demand to the ECMmotor. The table below lists the various ComfortNe...
Page 30 - Use of the CTK01AA transformer is recommended if; System Wiring using Two-Wires between Furnace and AC/HP; CT C; System Wiring between Furnace and Non-CT Compatible; Refer to; strongly; recommended that multiple wires into a single; System Wiring using Four-Wires
30 COMFORTNET™ SYSTEM Four wires are required between the indoor unit and thermo-stat. NOTE: Use of the CTK01AA transformer is recommended if installing a dual fuel/fossil fuel system. Failure to use thetransformer in the outdoor unit could result in over loading ofthe furnace transformer. 1 2 R C 1...
Page 31 - consecutive
31 COMFORTNET™ SYSTEM A CCESSING AND N AVIGATING THE A DVANCED F EATURES M ENUS The advanced system features are accessed using theComfortNet thermostat. These advanced features are accessedas follows: • On the CT thermostat Home Screen Display, touchthe Menu key to display additional key choices. •...
Page 32 - URNACE; CONFIGURATION; Sub menu Item; DIAGN OS TICS
32 COMFORTNET™ SYSTEM F URNACE A DVANCED F EATURES M ENUS Submenu Item Indication (for Display Only; not User Modifiable) Number of Heat Stages (HT STG) Displays the number of furnace heating stag es Input Rate (BTU/HR) Displays the furnace input rate in kBtu/hr Motor HP (1/2, ¾, or 1 MTR HP) Displa...
Page 33 - ETWORK; YSTEM; Refer to the instructions accompanying the CT
33 COMFORTNET™ SYSTEM N ETWORK TROUBLESHOOTING Communications is achieved by taking the differencebetween two dc signals. The signals and transmission linesare referred to as “data 1” and “data 2”. Each transmissionline is biased to approximately 2.5Vdc. During data recep-tion/transmission, the data...
Page 34 - LED LED; OWER
34 O PERATIONAL C HECKS & S AFETY C IRCUIT D ESCRIPTION H EATING M ODE The normal operational sequence in heating mode is as fol-lows: • R and W1 (or R and W1/W2) thermostat contacts close,initiating a call for heat. • Integrated control module performs safety circuit checks. • Induced draft blo...
Page 35 - balance; OOLING
35 O PERATIONAL C HECKS & S AFETY C IRCUIT D ESCRIPTION • Gas valve opens at end of igniter warm up period, deliveringgas to burners and establishing flame. • Integrated control module monitors flame presence. Gasvalve will remain open only if flame is detected. • If the thermostat call is for l...
Page 36 - BEFORE; Troubleshooting Chart
36 T ROUBLESHOOTING & M AINTENANCE Burner Flame S AFETY C IRCUIT D ESCRIPTION A number of safety circuits are employed to ensure safe andproper furnace operation. These circuits serve to control anypotential safety hazards and serve as inputs in the monitoringand diagnosis of abnormal function. ...
Page 37 - ISCELLANEOUS; AINTENANCE; ILTER
37 M ISCELLANEOUS F AULT R ECALL The ignition control is equipped with a momentary push-buttonswitch that can be used to display the last six faults on thedual 7-segment LED’s. The control must be in Standby Mode(no thermostat inputs) to use the feature. Depress the switchfor approximately 2 seconds...
Page 38 - Startup Procedure and Adjustments
38 M ISCELLANEOUS B URNERS Visually inspect the burner flames periodically during the heat-ing season. Turn on the furnace at the thermostat and allowseveral minutes for flames to stabilize, since any dislodgeddust will alter the flames normal appearance. Flames shouldbe stable, quiet, soft, and blu...
Page 39 - OP
39 T ROUBLESHOOTING C HART Co m fo r tNet™ Therm ost a t On ly Sym ptom s of A bnor m a l Opera ti on (Le g ac y & Com fortNet™ Th erm o stat ) D ia g no st ic /St a tus LED Codes Fault De scr ipt ion Messa ge Code P o ss ib le C a u se s Correct ive Action s No tes & Ca utio ns x Fur nace f...
Page 41 - EA
41 T ROUBLESHOOTING C HART Co m fo r tNet™ Therm ost at On ly Sym ptom s of A bnor m al Opera ti on (Leg ac y & C o m fort N et™ Therm ost at) D ia g no st ic /St atus LED Codes Fault De scr ipt ion Messa ge Code P o ss ib le C a u se s Correct ive Action s No tes & Ca utio ns x Fur nace fa ...
Page 44 - O P
44 S TATUS C ODES C 2 O P H I b 0 d 4 C 1 b 2 E 4 H I INTERNAL CONTROL FAULT/NO POWER NORMAL OPERATION LOCKOUT DUE TO EXCESSIVE RETRIES LOW STAGE PRESSURE SWITCH STUCK CLOSED AT START OF HEATING CYCLE LOW STAGE PRESSURE SWITCH STUCK OPEN OPEN HIGH LIMIT SWITCH FLAME DETECTED WHEN NO FLAME SHOULD BE ...
Page 45 - Speed Selectio n Dip Switches; IP; ComfortNetTM System - Airflow Consideration
45 A IR F LOW D ATA *DVC81155CX* *DVC80905CX* *DVC80703BX* *MVC81155CX* *MVC80905CX* *MVC80704BX* To set airflow: C ------ - 7.5 min/82% 60 sec/100% A ------- -------- 60 sec/100% TAP 1 2 3 4 5 6 7 8 To set Comfort Mode: B ON OFF ON OFF ON OFF ON OFF C OFF ON OFF ON OFF ON OFF ON B ------- 30 sec/50...
Page 47 - IG
47 *MVC8_AB, *DVC8_AA W IRING D IAGRAM TO +VDC TO MICRO TO R GND (4) + VDC (1) RX (2) TX (3) CIRCULATOR INDOOR AIR BLWR RD GY BL BK PROPERLY P OLARIZED HUMIDIFIER GND PROTECTION DEVICE HEAT OFF DELAY BURNER COMPARTMENT 24 V 3 A BL POWER SUPPLY WITH LINE 12 TO C 2 BK RD UNUSED DISCONN ECT POW ER 4 IG...