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INSTALLATION MANUAL
HIGH EFFICIENCY
TUBULAR HEAT EXCHANGER SERIES
MODELS: PT8-UH / FC8T-UH / FL8T-UH / LC8T-UH / LL8T-UH
(Two Stage Upflow / Horizontal / LowNOx)
40 - 120 MBH INPUT
(11.72 - 35.17 kW) INPUT
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Attic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Suspended Furnace / Crawl Space Installation . . . . . . . . . . . . 7
Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Upflow Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Horizontal Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Thermostat Chart - AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Thermostat Chart - HP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Accessory Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Twinning Wiring Diagram - 1H/1C Thermostat . . . . . . . . . . . . . . . . . 15
Twinning Wiring Diagram - 2H/1C Thermostat . . . . . . . . . . . . . . . . . 15
Twinning Wiring Diagram - 2H/2C Thermostat . . . . . . . . . . . . . . . . . 15
Vent Termination 10 ft. (3.0 m) or less . . . . . . . . . . . . . . . . . . . . . . . . 15
Vent Termination more than 10 ft. (3.0 m) . . . . . . . . . . . . . . . . . . . . . 16
Surfaces Identified with the Unit in an Upflow Configuration) . . . . . . . 4
Minimum Duct Sizing For Proper Airflow . . . . . . . . . . . . . . . . . . . . . . . 5
Round Duct Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Recommended Filter Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Nominal Manifold Pressure - High Fire . . . . . . . . . . . . . . . . . . . . . . . . 9
Nominal Manifold Pressure - Low Fire . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ratings & Physical / Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SECTION I: SAFETY
This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal
injury.
Understand and pay particular attention to the signal words DANGER,
WARNING, or CAUTION.
DANGER indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation, which, if not
avoided may result in minor or moderate injury. It is also used to
alert against unsafe practices and hazards involving only property dam-
age.
LIST OF SECTIONS
VENT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .22
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
LIST OF FIGURES
Vent Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Typical Sidewall Vent Application . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Typical Sidewall Vent and Termination Configuration . . . . . . . . . . . .17
Home Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Casing to the Burner Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Alternate Air Intake, Air Outlet and Chimney Connections . . . . . . . . .19
Air Inlet, Outlet and Chimney Connections . . . . . . . . . . . . . . . . . . . . .19
Typical Chimney Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Horizontal Air Inlet, Outlet and Chimney Connections . . . . . . . . . . . .20
Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . .20
Pressure Switch Tubing Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
LIST OF TABLES
Roof Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Unconfined Space Minimum Area in Square Inch . . . . . . . . . . . . . . .20
Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Filter Performance - Pressure Drop Inches W.C. and (kPa) . . . . . . . .27
Field Installed Accessories - Non Electrical . . . . . . . . . . . . . . . . . . . .27
Improper installation may create a condition where the operation of
the product could cause personal injury or property damage.
Improper installation, adjustment, alteration, service or mainte-
nance can cause injury or property damage. Refer to this manual
for assistance or for additional information, consult a qualified con-
tractor, installer or service agency.
This product must be installed in strict compliance with the installa-
tion instructions and any applicable local, state, and national codes
including, but not limited to building, electrical, and mechanical
codes.
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
272312-UIM-A-0407
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Related Manuals for York FC8T-UH
Summary of Contents for York FC8T-UH
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Page 1: Table Of Contents
INSTALLATION MANUAL HIGH EFFICIENCY EFFICIENCY RATING CERTIFIED TUBULAR HEAT EXCHANGER SERIES MODELS: PT8-UH / FC8T-UH / FL8T-UH / LC8T-UH / LL8T-UH ISO 9001 Certified Quality (Two Stage Upflow / Horizontal / LowNOx) Management System 40 - 120 MBH INPUT (11.72 - 35.17 kW) INPUT LIST OF SECTIONS SAFETY . -
Page 2: Safety
272312-UIM-A-0407 SPECIFIC SAFETY RULES AND PRECAUTIONS • Refer to the unit rating plate for the furnace model number, and then see the dimensions page of this instruction for return air ple- Only Natural gas or Propane (LP) gas are approved for use with num dimensions in Figure 1. - Page 3 272312-UIM-A-0407 INSPECTION As soon as a unit is received, it should be inspected for possible dam- age during transit. If damage is evident, the extent of the damage The furnace area must not be used as a broom closet or for any should be noted on the carrier’s freight bill.
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Page 4: Ductwork
272312-UIM-A-0407 TABLE 1: Unit Clearances to Combustibles (All Dimensions in Inches, and All Surfaces Identified with the Unit in an Upflow Configuration) Front Rear Left Side Right Side Flue Floor/ Line Application Closet Alcove Attic Bottom Contact In. (cm) In. (cm) In. (cm) In. -
Page 5: Minimum Duct Sizing For Proper Airflow
272312-UIM-A-0407 TABLE 2: Minimum Duct Sizing For Proper Airflow Airflow Return Rectangular Round Supply Rectangular Round CFM (m³/min) In² (cm²) in. x in. (cm x cm) in. (cm) dia. In² (cm²) in. x in. (cm x cm) in. (cm) dia. 1,200 (34) 280 (1806) 14 x 20 (35.6 x 50.8) -
Page 6: Dimensions
272312-UIM-A-0407 4” Diameter (VENT CONNECTION) POWER WIRING 7/8” HOLE 13-3/4 14-3/4 5-3/8 2-1/2 32-1/2 GAS INLET ACCESS 1-1/4 x 2-1/2 WIRING 7/8” K.O. T’STAT WIRING 7/8” K.O. 23-1/2 2-1/4 8-3/4 1-1/8 30-1/8 LEFT SIDE RIGHT SIDE FRONT 1-1/2 1-1/4 26-1/2 4”... -
Page 7: Typical Attic Installation
272312-UIM-A-0407 ATTIC INSTALLATION Horizontal Installations With a Cooling Coil Cabinet The furnace should be installed with coil cabinet part number specifi- cally intended for Horizontal application. If a matching cooling coil is SUPPLY AIR used, it may be placed directly on the furnace outlet and sealed to pre- LINE CONTACT ONLY PERMISSIBLE BETWEEN LINES FORMED BY THE vent leakage. -
Page 8: Filters
272312-UIM-A-0407 SECTION III: FILTERS SECTION IV: GAS PIPING FILTER INSTALLATION GAS SAFETY All applications require the use of an external filter. All filters and mount- ing provision must be field supplied. Refer to Tables 5 & 16 for acces- sory external filter kit options. An overpressure protection device, such as a pressure regulator, TABLE 5: Recommended Filter Sizes must be installed in the gas piping system upstream of the furnace... -
Page 9: Horizontal Gas Piping
272312-UIM-A-0407 Gas piping may be connected from either side of the furnace using any MANUAL of the gas pipe entry knockouts on both sides of the furnace. Refer to SHUT-OFF Figure 1 dimensions. VALVE DRIP GAS ORIFICE CONVERSION FOR PROPANE (LP) This furnace is constructed at the factory for natural gas-fired operation, PIPE GAS BURNERS... -
Page 10: Electrical Power
272312-UIM-A-0407 PROPANE AND HIGH ALTITUDE CONVERSION KITS It is very important to choose the correct kit and/or gas orifices for the altitude and the type of gas for which the furnace is being installed. Only use natural gas in furnaces designed for natural gas. Only use propane (LP) gas for furnaces that have been properly converted to use pro- pane (LP) gas. -
Page 11: Electrical Wiring
272312-UIM-A-0407 SUPPLY VOLTAGE CONNECTIONS LOW VOLTAGE CONTROL WIRING CONNECTIONS Install the field-supplied thermostat by following the instructions that IMPORTANT: The power connection leads and wiring box may be relo- come with the thermostat. With the thermostat set in the OFF position cated to the left side of the furnace. -
Page 12: Thermostat Chart - Ac
272312-UIM-A-0407 FIGURE 9: Thermostat Chart - AC Unitary Products Group... -
Page 13: Thermostat Chart - Hp
272312-UIM-A-0407 FIGURE 10: Thermostat Chart - HP Unitary Products Group... -
Page 14: Accessory Connections
272312-UIM-A-0407 ACCESSORY CONNECTIONS Twinning Duct System The furnace control will allow power-switching control of various acces- Twinned furnaces must only be applied on a common duct system. A sories. Refer to Figure 11, for connection details. single air supply plenum must be used for both furnaces and coil(s). Separate plenums and supply ducts systems cannot be utilized. -
Page 15: Twinning Wiring Diagram - 1H/1C Thermostat
272312-UIM-A-0407 Twinning Operation Heating - On a call for low-stage heat (W1 signal) from the wall thermo- stat, both furnaces will start the ignition sequence and the burners on both furnaces will light and run at low fire. After a short delay, both blow- W1 RELAY ers will come on and operate at the low heat speed. -
Page 16: Vent Termination More Than 10 Ft. (3.0 M)
272312-UIM-A-0407 TABLE 9: Roof Pitch MORE THAN 10 FT (3.0 m) ROOF PITCH H(min) ft Flat to 6/12 0.30 3 FT (0.9 m) MIN. 6/12 to 7/12 1.25 0.38 Over 7/12 to 8/12 0.46 Over 8/12 to 9/12 0.61 NOTE: NO Over 9/12 to 10/12 0.76 HEIGHT ABOVE... -
Page 17: Typical Sidewall Vent Application
272312-UIM-A-0407 VENTING INTO AN EXISTING CHIMNEY FAN ASSISTED FURNACE FAN ASSISTED For Category I installations, the furnace shall be connected to a factory & WATER HEATER FURNACES built chimney or vent complying with a recognized standard, or a EXTERIOR masonry or concrete chimney lined with a material acceptable to the VENT HOOD authority having jurisdiction. -
Page 18: Home Layout
272312-UIM-A-0407 VENT TERMINAL FIXED AIR SUPPLY CLOSED AREA WHERE TERMINAL IS NOT PERMITTED FIXED CLOSED OPERABLE FIGURE 20: Home Layout Canadian Installations US Installation A. Clearance above grade, veranda, porch, deck, or balcony 12 inches (30 cm) 12 inches (30 cm) 12 inches (30 cm) for models <100,000 B. -
Page 19: Combustion Airflow Path Through The Furnace Casing To The Burner Box
272312-UIM-A-0407 FAN-ASSISTED COMBUSTION SYSTEM CHIMNEY OR An appliance equipped with an integral mechanical means to either GAS VENT VENTILATION LOUVERS draw or force products of combustion through the combustion chamber (each end of attic) and/or heat exchanger. Ambient Combustion Air Supply This type installation will draw the air required for combustion from within the space surrounding the appliance and from areas or rooms adjacent to the space surrounding the appliance. -
Page 20: Typical Chimney Connections
272312-UIM-A-0407 CHIMNEY OR GAS VENT When a Category I furnace is removed or replaced, the original venting system may no longer be correctly sized to properly vent the attached appliances. An improperly sized vent system can cause CARBON MONOXIDE to spill into the living space causing personal injury, and or death. OPENING TABLE 11: Free Area Minimum Free Area Required for Each Opening... -
Page 21: Safety Controls
272312-UIM-A-0407 Ventilated Combustion Air Multi-story or common venting systems are permitted and must be installed in accordance with the National Fuel Gas Code, ANSI Z223.1/ The ventilated attic space or a crawl space from which the combustion NFPA 54 and / or the CSA B149.1, Natural Gas and Propane Installa- air is taken must comply with the requirements specified in “AIR tion Codes, local codes, and the manufacture's instructions. -
Page 22: Start-Up And Adjustments
272312-UIM-A-0407 PRESSURE SWITCHES There is an accessory kit (1PK0601) available from Source 1, which has the following items: This furnace is supplied with two pressure switches, which monitor the flow through the combustion air/vent piping system. This switches de- • 1 - 12” (30 cm) length x 1/8” (0.3 cm) diameter tubing energize the ignition control module and the gas valve if any of the fol- •... - Page 23 272312-UIM-A-0407 In the USA use the following formula to calculate the furnace input. For natural gas multiply the heat content of the gas BTU/SCF or Default 1030 BTU/SCF (38.4 MJ/m ), times 2 cubic ft. (0.056 m) of gas measured at the gas meter, times a barometric pressure and temperature correction factor of 0.960;...
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Page 24: Gas Valve
272312-UIM-A-0407 Turn gas and electrical supplies on and follow the operating instructions to place the unit back in operation. Adjust manifold pressure by adjusting gas valve regulator screw for the appropriate gas per the following: Be sure to relight any gas appliances that were turned off at the start of this input check. -
Page 25: Furnace Control Board
272312-UIM-A-0407 ADJUSTMENT OF TEMPERATURE RISE The temperature rise, or temperature difference between the return air and the heated supply air from the furnace, must be within the range shown on the furnace rating plate and within the application limitations as shown in Table 8. The temperature rise, or temperature difference between the return DIRECT DRIVE MOTORS air and the supply (heated) air from the furnace, must be within the... - Page 26 272312-UIM-A-0407 RAPID AMBER FLASH: Flame sense current is below 1.5 microamps. STEADY ON RED: Control failure. Replace control board. Check and clean flame sensor. Check for proper gas flow. 60-MINUTE AUTOMATIC RESET FROM LOCKOUT: This control 4 AMBER FLASHES: The control board is recieving a “Y” signal from includes a “watchdog”...
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Page 27: Filter Performance - Pressure Drop Inches W.c. And (Kpa)
272312-UIM-A-0407 TABLE 15: Filter Performance - Pressure Drop Inches W.C. and (kPa) Filter Type Minimum Airflow Range Opening Size Disposable Washable Fiber Pleated In W.C. In W.C. In W.C. /min 0 - 750 0 - 21.4 1484 0.01 0.00249 0.01 0.00249 0.15 0.03736... -
Page 28: Blower Performance Cfm - Upflow (Without Filter) - Bottom Return
272312-UIM-A-0407 TABLE 17: Blower Performance CFM - Upflow (without filter) - Bottom Return Bottom Airflow Data (SCFM) Bottom Airflow Data (cm/m) MODELS Input / Speed Ext. Static Pressure (in. H2O) Ext. Static Pressure (kPa) 0.025 0.050 0.075 0.100 0.125 0.149 0.174 0.199 0.224 0.249 High 1610 1540 1460 1360 1290 1200 1110 1020 900 45.6 43.6 41.3 38.5 36.5 34.0 31.4 28.9 25.5 21.5... -
Page 29: Blower Performance Cfm - Upflow (Without Filter) - Left Side Return
272312-UIM-A-0407 TABLE 18: Blower Performance CFM - Upflow (without filter) - Left Side Return Left Side Airflow Data (SCFM) Left Side Airflow Data (cm/m) MODELS Input / Speed Ext. Static Pressure (in. H2O) Ext. Static Pressure (kPa) 0.025 0.050 0.075 0.100 0.125 0.149 0.174 0.199 0.224 0.249 High 1810 1730 1660 1570 1480 1390 1300 1200 1090 930 51.3 49.0 47.0 44.5 41.9 39.4 36.8 34.0 30.9 26.3... -
Page 30: Wiring Diagram
272312-UIM-A-0407 SECTION IX: WIRING DIAGRAM FIGURE 31: Wiring Diagram Unitary Products Group... - Page 31 272312-UIM-A-0407 NOTES Unitary Products Group...
- Page 32 Subject to change without notice. Printed in U.S.A. 272312-UIM-A-0407 Copyright © by York International Corp. 2007. All rights reserved. Supersedes: 167185-UIM-C-0806 Unitary 5005 Norman Product York Group Drive 73069...