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035-20464-002 Rev. A (1004)

EFFICIENCY
RATING
CERTIFIED

This product was manufactured
in a plant whose quality system
is certified/registered as being
in conformity with ISO 9001.

HIGH EFFICIENCY
TUBULAR HEAT EXCHANGER SERIES

MODELS: GY8S / GM8S / LY8S / LM8S / LF8
(Single Stage Upflow / Horizontal / LoNOx)

40 - 130 MBH INPUT
(11.72 - 38.10 KW) INPUT

INSTALLATION MANUAL

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.

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.

TABLE OF CONTENTS

SAFETY  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DUCTWORK  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FILTERS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
GAS PIPING   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ELECTRICAL POWER   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

TWINNING AND STAGING  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
VENT SYSTEM   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
SAFETY CONTROLS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .19
WIRING DIAGRAM   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

LIST OF FIGURES

Dimensions   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Furnace Base Rectangular Perforated Panel   . . . . . . . . . . . . . . . . . . . 6
Typical Attic Installation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Suspended Furnace / Crawl Space Installation  . . . . . . . . . . . . 7
Side Return Cutout Markings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Upflow Gas Piping  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Horizontal Gas Piping   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Wiring  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Line Wiring Connections   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Heating and Cooling Thermostat Connections   . . . . . . . . . . . . . . . . . 11
Accessory Connections  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Typical Twinned Furnace Application   . . . . . . . . . . . . . . . . . . . . . . . . 11
Single Stage Twinning Wiring Diagram  . . . . . . . . . . . . . . . . . . . . . . . 12
Two-Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 13
Vent Termination  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Vent Termination   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Typical Sidewall Vent Application  . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Typical Sidewall Vent and Termination Configuration   . . . . . . . . . . . .14
Home Layout   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Combustion Airflow Path Through The Furnace Casing to the Burner 
Box  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Alternate Air Intake, Air Outlet and Chimney Connections  . . . . . . . . .16
Air Inlet, Outlet and Chimney Connections . . . . . . . . . . . . . . . . . . . . .16
Typical Chimney Connections   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Horizontal Air Inlet, Outlet and Chimney Connections  . . . . . . . . . . . .17
Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . .17
Pressure Switch Tubing Routing   . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Gas Valve  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Reading Gas Pressure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Typical Heat/Cool Speed Tap Connections  . . . . . . . . . . . . . . . . . . . .22
Wiring Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

LIST OF TABLES

Unit Clearances to Combustibles  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Minimum Duct Sizing For Proper Airflow  . . . . . . . . . . . . . . . . . . . . . . . 4
Round Duct Size   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Cabinet and Duct Dimensions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Filter Sizes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Inlet Gas Pressure Range  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
High Altitude Conversion  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ratings & Physical / Electrical Data - Upflow Models   . . . . . . . . . . . . 10
Roof Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Horizontal Venting   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Free Area  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Unconfined Space Minimum Area in Square Inch   . . . . . . . . . . . . . . .17
Inlet Gas Pressure Range   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Filter Performance - Pressure Drop Inches W.C. and (kPa) . . . . . . . .22
Blower Performance CFM - Upflow (without filter) - Bottom Return  . .23
Blower Performance CFM - Upflow (without filter) - Left Side Return  24

Summary of Contents for GM8S

Page 1: ...TERS 7 GAS PIPING 8 ELECTRICAL POWER 9 TWINNING AND STAGING 11 VENT SYSTEM 13 SAFETY CONTROLS 18 START UP AND ADJUSTMENTS 19 WIRING DIAGRAM 26 LIST OF FIGURES Dimensions 5 Furnace Base Rectangular Per...

Page 2: ...ead and follow all instructions in this manual can result in furnace malfunction death personal injury and or property damage Furnaces for installation on combustible flooring shall not be installed d...

Page 3: ...er clear ances for combustible materials where accessibility clearances are greater Installation in a residential garage 1 A gas fired furnace for installation in a residential garage must be installe...

Page 4: ...he total square inch of duct attached to the furnace plenum is 300 8 square inch This exceeds the recommended 280 square inch of duct In this example the duct system attached to the plenum has a suffi...

Page 5: ...above the maximum supply air temperature will cause the heat exchanger to overheat causing premature heat exchanger failure Improper duct sizing dirty air filters incorrect manifold pressure incorrect...

Page 6: ...thout a Cooling Coil Cabinet When installing this appliance the furnace must be installed so as to create a closed duct system the supply duct system must be con nected to the furnace outlet and the s...

Page 7: ...the filter exter nal to the cabinet IMPORTANT Some accessories such as electronic air cleaners and pleated media may require a larger side opening Follow the instruc tions supplied with that accessory...

Page 8: ...ge to the furnace or some of its components that will result in property damage and loss of life FIGURE 6 Gas Valve INLET WRENCH BOSS INLET PRESSURE PORT O N O FF ON OFF SWITCH Shown in ON position MA...

Page 9: ...conversions are required in order for the appliance to satisfactory meet the application An authorized distributor or dealer must make all gas conversions In Canada a certified conversion station or o...

Page 10: ...o the terminal board on the ignition module as shown in Figure 7 Electronic thermo stats may require the common wire to be connected as shown with the dashed line in Figure 7 or 8 Apply strain relief...

Page 11: ...e mixing device must be installed before any ducts that supply air to occupied spaces Twinning causes both indoor fans to operate simultaneously If a mixing device is not used any ducts that are conne...

Page 12: ...Staging The single wire twinning feature of this board can also be used for stag ing of two furnaces With this feature a single wire is connected between the TWIN terminal on one furnace board to the...

Page 13: ...e converted for high altitude operation Refer to SECTION IV GAS PIP ING of these instructions and the proper high altitude application instruction for details VENTING INTO AN EXISTING CHIMNEY For Cate...

Page 14: ...on FAN ASSISTED FURNACE WATER HEATER FAN ASSISTED FURNACES VENT PIPE HOT WATER TANK FURNACE OPTIONAL SIDEWALL VENT SYSTEM field supplied EXTERIOR VENT HOOD FIGURE 19 Typical Sidewall Vent and Terminat...

Page 15: ...to prevent sagging The vent system may be supported by the use of clamps or hangers secured to a permanent part of the structure every 4 ft 1 22 m FAN ASSISTED COMBUSTION SYSTEM An appliance equipped...

Page 16: ...sub tracting the blockage area of all fixed louvers grilles or screens from the gross area of the opening 2 Apertures in a fixed louver a grille or screen shall have no dimen sion smaller than 0 25 0...

Page 17: ...horizontally from the burner level of the appliance Refer to AIR SOURCE FROM OUTDOORS AND VENT AND SUPPLY AIR SAFETY CHECK in these instructions for additional information and safety check procedure 2...

Page 18: ...he combustion air blower heat exchanger or a blocked vent pipe connection Corrective action is required These are manual reset controls that must be reset before operation can continue CARBON MONOXIDE...

Page 19: ...ngth x 1 8 0 3 cm diameter tubing 1 5 16 0 8 cm tee 1 5 16 0 8 cm x 1 8 3 175 mm reducing coupling 1 1 8 0 3 cm adapter There is a accessory kit 1PK0602 available from Source 1 which has the following...

Page 20: ...ivided by the time it took to measure 2 cubic ft 0 0566 m3 of gas from the gas meter For Propane LP Gas multiply the Heat content of the gas MJ m3 or Default 93 14 times 0 00283 m3 of gas measured at...

Page 21: ...e the unit back in operation 3 Adjust manifold pressure by adjusting gas valve regulator screw for the appropriate gas per the following IMPORTANT If gas valve regulator is turned in clockwise manifol...

Page 22: ...pres sure drop 3 Determine the External System Static Pressure ESP without the filter 4 Select a filter pressure drop from the table based upon the number of return air openings or return air opening...

Page 23: ...7 Medium 1470 1450 1440 1430 1390 1360 1310 1270 1220 1150 41 6 41 1 40 8 40 5 39 4 38 5 37 1 36 0 34 5 32 6 Low 1260 1260 1260 1260 1250 1200 1150 1110 1070 1010 35 7 35 7 35 7 35 7 35 4 34 0 32 6 31...

Page 24: ...52 4 48 4 44 5 36 8 Medium Low 1690 1690 1650 1610 1540 1480 1410 1280 1170 1030 47 9 47 9 46 7 45 6 43 6 41 9 39 9 36 2 33 1 29 2 Low 1350 1330 1310 1290 1260 1220 1150 1050 970 860 38 2 37 7 37 1 3...

Page 25: ...s SEE CHART PAGE 6 1PS0302 1PS0311 1PS0312 1BR0314 EXTERNAL BOTTOM RETURN FILTER with High Velocity Filter for Horizontal Application for Upflow Bottom Return Application 14 1 2 CABINETS 1BR0317 17 1...

Page 26: ...035 20464 002 Rev A 1004 26 Unitary Products Group SECTION X WIRING DIAGRAM FIGURE 31 Wiring Diagram...

Page 27: ...035 20464 002 Rev A 1004 Unitary Products Group 27 NOTES...

Page 28: ...e without notice Printed in U S A 035 20464 002 Rev A 1004 Copyright by York International Corp 2004 All rights reserved Supersedes 035 20464 001 Rev A 0704 Unitary 5005 Norman Product York OK Group D...

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