Sterling QVES User Manual

INSTALLATION AND SERVICE MANUAL

J30-05392

INDOOR GAS-FIRED DUCT FURNACE

(POWER VENTED)

ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR TYPE OF GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE AGREE WITH THOSE AT THE POINT OF INSTALLATION. RECORD THE UNIT MODEL AND SERIAL No.(s) IN THE SPACE PROVIDED. RETAIN FOR FUTURE REFERENCE.

Model No. Serial No.

FOR Y OUR SAFETY The use and storage of gasoline or other ﬂ ammable vapors and liquids in open containers in the vicinity of this appliance is hazardous.

FOR Y OUR SAFETY

If you smell gas:

1. Open windows.

2. Don't touch electrical switches.

3. Extinguish any open ﬂ ame.

4.Immediately contact your gas supplier .

DISM-17

Improper installation, adjustment, alteration, service , or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instruction thoroughly before installing or servicing this equipment.

APPROVED FOR USE IN CALIFORNIA WHEN EQUIPPED WITH INTERMITTENT PILOT IGNITION

Install, operate, and maintain unit in accordance with the manufacturer's instructions to avoid exposure to fuel substances, or substances from incomplete combustion, which can cause death or serious illness. The state of California has determined that these substances may cause cancer, birth defects, or other reproductive harm.

INSTALLER'S RESPONSIBILITY

Installer Please Note: This equipment has been test fired and inspected. It has been

shipped free from defects from our factory. However, shipment and installation problems such as loose wires, leaks, or loose fasteners may occur. It is the installer's

responsibility to inspect and correct any problem that may be found.

Look in direction of air ﬂ ow

RECEIVING INSTRUCTIONS

Inspect shipment immediately when received to determine if any damage has occurred to the unit during shipment. After the unit has been uncrated, check for any visible damage to the unit. If any damage is found, the consignee should sign the bill of lading indicating such damage and immediately file claim for damage with the transportation company.

to determine if your unit is right or left hand accessible.

260 NORTH ELM ST., WESTFIELD, MA 01085

TEL: (413) 568-9571 FAX: (413) 562-8437

www.mestek.com

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MODEL TYPE DESIGNA TION

Figure 1 = Power Vented Duct Furnace (Bottom Access, Rear Vent Position, Intermittent Pilot Ignition) Figure 2 = Side Service Power Vented Duct Furnace (Side Access, Rear Vent Position, Intermittent Pilot Ignition)

TABLE OF CONTENTS

GENERAL SAFETY INFORMATION ...................................................................................................................2, 3

DUCT FURNACES (POWER VENTED)

SPECIFICATIONS .......................................................................................................................................4

PERFORMANCE DATA ...............................................................................................................................5

INSTALLATION

Location, Clearances ......................................................................................................................6

Ductwork, Air Flow, Ventilation, Bypass ..........................................................................................7

Suspension .....................................................................................................................................8

Electrical Connections ....................................................................................................................9

Venting ..............................................................................................................................10 thru 15

Gas Piping ....................................................................................................................................16

Pipe Installation ............................................................................................................................17

OPERATION

Power Vented Units with Intermittent Pilot ........................................................................18 thru 20

Oriﬁ ce Sizing ................................................................................................................................20

Adjustments ............................................................................................................................20, 21

MAINTENANCE ........................................................................................................................................21

COMPONENT PARTS ...................................................................................................................22, 23, 24

TROUBLESHOOTING CHART ..................................................................................................................25 thru 28

REPLACEMENT PARTS ........................................................................................................................................29

WARRANTY ...........................................................................................................................................................29

UNIT NUMBER DESCRIPTION .............................................................................................................................30

START-UP/INSPECTION SHEET ..........................................................................................................................32

GENERAL SAFETY INFORMATION

The duct furnace design is certified by ETL for use with natural and LP (propane) gases. ANSI and NFPA Standards as well as Canadian installation codes referred to in this manual are the ones that were applicable at the time the design was certified. In addition, the duct furnace may be installed on the downstream side of a cooling unit, without need of a bypass duct.

If the unit is to be installed at an altitude exceeding 2,000 feet (610m) above sea level, derate the input by 4% for each 1,000 foot (305m) rise above sea level. Special orifices are required for installations above 2,000 feet (610m).

When units are installed in Canada, any reference to derations at altitudes in excess of 2000 feet (610m) are to be ignored. At altitudes of 2000 to 4500 feet (610 to 1372m), the units must be oriﬁ ced to 90% of the normal altitude rating, and be so marked in accordance with ETL certiﬁ cation.

The following terms are used throughout this manual, in addition to ETL requirements, to bring attention to the presence of potential hazards or to important information concerning the product:

Indicates an imminently hazardous situation which, if not av oided, will result in death, serious injury or substantial property damage.

Indicates an imminently hazardous situation which, if not avoided, could result in death, serious injury or substantial property damage.

Indicates an imminently hazardous situation which, if not avoided, may result in minor injury or property damage.

NOTICE: Used to notify of special instructions on installation, operation or maintenance which are important to equipment but not related to personal injury hazards.

GENERAL SAFETY INFORMATION

Failure to comply with the general safety information may result in extensive property damage, severe personal injury or death.

This product must be installed by a licensed plumber or gas ﬁ tter when installed within the Commonwealth of Massachusetts.

Installation must be made in accordance with local codes, or in absence of local codes, with the latest edition of ANSI Standard Z223.1 (N.F.P.A. No. 54) National Fuel Gas Code. All of the ANSI and NFPA

Standards referred to in these installation instructions are those that were applicable at the time the design of this appliance was certified. The ANSI Standards are available from the CSA Infor mation Ser vices, 1-800463-6727. The NFPA Standards are available from the National Fire Protection Association, Batterymarch Park, Quincy, MA 02269. These duct furnaces are designed f or use in airplane hangars when installed in accordance with current ANSI/NFPA No. 409 and in public garages when installed in accordance with current NFPA No. 88A and NFPA No. 88B.

If installed in Canada, the installation must conform with local building codes, or in absence of local building codes, with CSA-B149.1 “Installation Codes for Natural Gas Burning Appliances and Equipment" or CSA-B149.8 “Installation Codes for Propane Gas Burning Appliances and Equipment”. These indoor duct furnaces have been designed and certiﬁ ed to comply with CSA 2.6. Also see sections on installation in AIRCRAFT HANGARS and PUBLIC GARAGES.

Do not alter the duct furnace in any way or damage to the unit and/or severe personal injury or death may occur!

Disconnect all power and gas supplies before installing or servicing the heater . If the power disconnect is out of sight, lock it in the open position and tag it to prevent unexpected application of power . Failure to do so could result in fatal electric shock, or severe personal injury.

Insure that all power sources conform to the requirements of the unit heater or damage to the unit will result!

Follow installation instructions CAREFULLY to avoid creating unsafe conditions. All wiring should be done and checked by a qualiﬁ ed electrician, using copper wire only. All external wiring must conform to applicable local codes, and to the latest edition of the National Electric Code ANSI/NFPA No. 70. All gas connections should be made and leak-tested by a suitably qualiﬁ ed individual, per instructions in this manual.

Also follow procedures listed on the “Gas Equipment Start-up” sheet located in this manual.

Use only the fuel for which the heater is designed (see rating plate). Using LP gas in a heater that requires natural gas, or vice versa, will create the risk of gas leaks, carbon monoxide poisoning and explosion.

Do not attempt to convert the heater for use with a fuel other than the one intended. Such conversion is dangerous, and could create unsafe conditions that result in death, serious personal injury or property damage.

Make certain that the power source conforms to the electrical requirements of the heater.

Do not depend upon a thermostat or other switch as sole means of disconnecting power when installing or servicing heater. Always disconnect power at main circuit breaker as described above. Failure to do so could result in fatal electric shock.

Special attention must be given to any grounding information pertaining to this heater. To prevent the risk of electrocution, the heater must be securely and adequately grounded. This should be accomplished b y connecting a grounded conductor between the service panel and the heater. To ensure a proper ground, the grounding means must be tested by a qualiﬁ ed electrician.

Do not insert ﬁ ngers or foreign objects into the heater or its air moving device. Do not block or tamper with the heater in any manner while in operation or just after it has been turned off, as some parts may be hot enough to cause injury.

This heater is intended for general heating applications ONLY. It must NOT be used in potentially dangerous locations such as ﬂ ammable, explosive, chemical-laden or wet atmospheres.

In cases in which property damage may result from malfunction of the heater, a backup system or a temperature sensitive alarm should be used.

The open end of piping systems being purged shall not discharge into areas where there are sources of ignition or into conﬁ ned spaces UNLESS precautions are taken as follows: (1) By ventilation of the space, (2) control of purging rate, (3) elimination of all hazardous conditions. All precautions m ust be taken to perform this operation in a safe manner!

Unless otherwise speciﬁ ed, the following conversions may be used for calculating SI unit measurements: 1 foot = 0.305 m 1 inch = 25.4 mm 1 gallon = 3.785 L 1 pound = 0.453 kg 1 psig = 6.894 kPa 1 cubic foot = 0.028 m

1000 Btu per hour = 0.293 kW 1 inch water column = 0.249 kPa 1000 Btu/Cu. Ft. = 37.5 MJ/m

liter/second = CFM x 0.472 meter/second = FPM ÷ 196.8

SPECIFICATIONS

Figure 1 - Power Vented Furnace — Bottom Service Access

Table 1 - Power Vented Duct Furnace

UNIT A B C D (Dia) F GAS INLET WEIGHT SIZE in. in. in. in. in. in. lb. (mm) (mm) (mm) (mm) (mm) NAT. LP (kg)

100 17-7/8 15-1/2 17-1/8 4 23-7/8 1/2 1/2 173 (454) (394) (435) (102) (606) (78) 125 20-5/8 18-1/4 19-7/8 4 25-5/8 1/2 1/2 186 (524) (464) (505) (102) (651) (84) 150 20-5/8 18-1/4 19-7/8 4 26-5/8 1/2 1/2 197 (524) (464) (505) (102) (676) (89) 175 23-3/8 21 22-5/8 4 29-3/8 1/2 1/2 216 (594) (533) (575) (102) (746) (98) 200 26-1/8 23-3/4 25-3/8 5 32-1/8 1/2 1/2 232 (664) (603) (645) (127) (816) (105) 225 28-7/8 26-1/2 28-1/8 5 34-7/8 3/4 1/2 OR 3/4 254 (733) (673) (714) (127) (886) (115) 250 31-5/8 29-1/4 30-7/8 5 37-5/8 3/4 1/2 OR 3/4 263 (803) (743) (784) (127) (956) (119) 300 37-1/8 34-3/4 36-3/8 6 43-1/8 3/4 1/2 OR 3/4 312 (943) (883) (924) (152) (1095) (142) 350 42-5/8 40-1/4 41-7/8 6 48-5/8 3/4 1/2 OR 3/4 389 (1083) (1022) (1064) (152) (1235) (176) 400 48-1/8 45-3/4 47-3/8 6 54-1/8 3/4 1/2 OR 3/4 403 (1222) (1162) (1203) (152) (1375) (183)

Figure 2 - Power Vented Duct Furnace — Side Service Access

Table 2

PERFORMANCE DATA

INPUT OUTPUT (MAX) (MIN) MIN. Temp. Rise P.D. in. MAX. Temp. Rise P.D. in. UNIT MBH MBH MBH CFM Deg. F. of Water CFM Deg. F. of Water SIZE (kW) (kW) (kW) (cu. m/s) (Deg. C.) (kPa) (cu. m/s) (Deg. C.) (Pascals)

100 100 50 80 929 80 0.12 2469 30 0.90 (29.3) (14.6) (23.4) (0.438) (44) (0.03) (1.165) (17) (0.22) 125 125 62.5 100 1157 80 0.13 3086 30 0.80 (36.6) (18.3) (29.3) (0.546) (44) (0.03) (1.457) (17) (0.20) 150 150 75 120 1389 80 0.15 3704 30 0.75 (43.9) (22.0) (35.1) (0.656) (44) (0.04) (1.748) (17) (0.19) 175 175 87.5 140 1620 80 0.14 4321 30 0.75 (51.2) (25.6) (41.0) (0.765) (44) (0.03) (2.040) (17) (0.19) 200 200 100 160 1852 80 0.14 4938 30 0.75 (58.6) (29.3) (46.9) (0.874) (44) (0.03) (2.331) (17) (0.19) 225 225 112.5 180 2083 80 0.14 5556 30 0.75 (65.9) (32.9) (52.7) (0.983) (44) (0.03) (2.622) (17) (0.19) 250 250 125 200 2315 80 0.14 6173 30 0.80 (73.2) (36.6) (58.6) (1.093) (44) (0.03) (2.914) (17) (0.20) 300 300 150 240 2778 80 0.13 7407 30 0.90 (87.8) (43.9) (70.3) (1.311) (44) (0.03) (3.496) (17) (0.22) 350 350 175 280 3241 80 0.13 8642 30 0.90 (102.5) (51.2) (82.0) (1.530) (44) (0.03) (4.079) (17) (0.22) 400 400 200 320 3704 80 0.14 9877 30 0.90 (117.1) (58.6) (93.7) (1.748) (44) (0.03) (4.662) (17) (0.22)

Ratings are shown for unit installations at elevations between 0 and 2,000 ft. (610m). For unit installations in U.S.A. above 2,000 ft. (610m), the unit input must be derated 4% for each 1,000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code, ANSI Standard Z223.1 (N.F.P.A. No. 54). For installations in Canada, any references to deration at altitudes in excess of 2,000 ft. (610m) are to be ignored. At altitudes of 2,000 to 4,500 ft. (610 to 1372m), the unit must be derated 90% of the normal altitude rating, and be so marked in accordance with the ETL certiﬁ cation.

TEMPERATURE RISE AND PRESSURE DROP GRAPH

INSTALLATION

Do not install duct furnaces in corrosive or ﬂ ammable atmospheres! Premature failure of, or severe damage to the unit will result!

Av oid locations where extreme drafts can affect burner operation. Duct furnaces must not be installed in locations where air for combustion would contain chlorinated, halogenated or acidic vapors. If located in such an environment, premature failure of the unit will occur!

NOTICE: Location of duct furnaces is related directly to the selection of sizes. Basic rules are as follows:

ACCESSIBILITY: If unit is a bottom service access type

allow a minimum of 21 inches (533mm) at the bottom of the unit to facilitate servicing the burners and pilot, or six inches (152mm) if the unit has a side access burner drawer. Provision should also be made to assure accessibility for recurrent maintenance purposes. See Table 1, dimension “F” for required service clearance for burner drawer on side service models.

AIRCRAFT HANGARS: Duct furnaces must be installed in aircraft hangars and public garages as follows: In aircraft hangars, duct furnaces must be at least 10 feet (3.05m) above the upper surface of wings or engine enclosures of the highest aircraft to be stored in the hangar and 8 feet (2.4m) abov e the ﬂ oor in shops, ofﬁ ces and other sections of the hangar where aircraft are not stored or housed. Refer to current ANSI/NFPA No. 409, Aircraft Hangars. In Canada, installation is suitable in aircraft hangars when acceptable to the enforcing authorities.

PUBLIC GARAGES: In repair garages, duct furnaces must be installed in a detached building or room separated from repair areas as specified in the latest edition of NFPA 88B, Repair Garages.

In parking structures, duct furnaces must be installed so that the burner flames are located a minimum of 18 inches (457mm) above the floor or protected by a partition not less than 18 inches (457mm) high. Refer to the latest edition of NFPA 88A, Parking Structures.

In Canada, installation must be in accordance with the latest edition of CSA B149 “Installation Codes for Gas Burning Appliances and Equipment.”

When the unit is equipped with an automatic gas ignition system, the duct furnace must be installed such that the gas ignition control system is not directly exposed to water spray, rain or dripping water.

Duct furnaces should not be installed to maintain low temperatures and/or freeze protection of buildings. A minimum of 50°F (10°C) thermostat setting must be maintained. If duct furnaces are operated to maintain

lower than 50°F (10°C), hot flue gases are cooled inside the heat exchanger to the point where water vapor (a ﬂ ue gas by product) condenses onto the heat exchanger walls. The result is a mildly corrosive acid that prematurely corrodes the aluminized heat exchanger and can actually drip water down from the duct furnace onto ﬂ oor surface. Additional duct fur naces should be installed if a minimum 50°F (10°C) thermostat setting cannot be maintained.

CLEARANCES

Under no circumstances should combustible material be located within the clearances speciﬁ ed in T able 3. Failure to pro vide proper clearance could result in personal injury or equipment damage from ﬁ re.

Maintain adequate clearances around air openings into combustion chamber:

Table 3 - Minimum Clearances†

SIDES

TOP

BOTTOM*

FLUE

†*21" (533 mm) is required for accessibility on furnaces with bottom access burner compartments.

6" (152 mm) 6" (152 mm) 6" (152 mm) 6" (152 mm)

†When the clearances required for accessibility are greater than the minimum safety clearances, the accessibility clearances take precedence.

DRAFTS: Avoid installing the duct furnace in an extremely drafty location. Strong drafts may cause pilot outage. Units with intermittent pilot ignition may be preferable in areas where drafts cannot be avoided.

Atmospheres containing commercial solvents or chlorinated hydrocarbons will produce corrosive acids when coming in contact with the ﬂ ames. This will greatly reduce the life of the gas duct furnace and may void the warranty. Avoid such areas.

NOTICE: If the gas duct furnace is to be used in a building classified as having a hazardous atmosphere, the installation must comply with the standards set by the National Board of Fire Underwriters. Consult the authorities having jurisdiction before starting the job.

The duct furnace must be installed on the positive pressure side of the air circulation blower.

INSTALLATION

DUCTWORK

Properly designed and installed ductwork, providing a uniformly distributed flow of air across the surfaces of the heat exchanger, is essential to satisfactory unit performance and life of the equipment.

All duct connection flanges/seams must be sealed to prevent air leaks. Sealant/tape must be suitable for temperatures 250°F (121°C) minimum.

Any attempt to straighten the 90° duct connection ﬂ anges on the duct furnaces will affect the operation of the furnace and will void the warranty.

If uniform air distribution is not obtained, install additional bafﬂ es and/or turning vanes in the ductwork.

Figures 3 and 4 illustrate recommended ductwork designs for both the straight-through and elbowed air inlet arrangements.

Access panels large enough to observe smoke and reflected light, and to detect the presence of leaks in the heating equipment, are required both upstream and downstream from gas duct furnaces. These panels must be sealed to prevent air leaks. If allowed by local regulations, install canvas connectors between the ductwork and fan discharge opening to eliminate the transmission of mechanical vibration.

AIR FLOW

The installation is to be adjusted to obtain an air throughput within the range speciﬁ ed on the appliance rating plate.

COMBUSTION INLET AIR VENTILATION Inlet Air From Another Room — If the duct furnace is

installed in a tightly constructed room or compartment, provide two inlet air openings. The size of each vent opening should be no less than one square inch (6.452 square centimeters) of free area for each 1000 Btu/hr. (293 W) input. Each opening must not be less than 100 square inches (645 square centimeters).

Inlet Air From Outdoors — If the enclosed space is to have inlet combustion air from the outside, the vent opening must not be smaller than one square inch (6.452 square centimeters) of free area for each 2500-3000 Btu/hr. (733-879 W) input. Each opening must not be less than 100 square inches (645 square centimeters).

BYPASS

When a gas duct furnace is installed to operate in conjunction with a summer air conditioning system, the CFM air delivery of the system blower should be adjusted to meet the design air volume requirements for cooling. If this CFM delivery is greater than that required for heating, resulting in a low air temperature rise, install a damper bypass around the gas duct furnace to bypass a portion of the air.

Insure that all hardware used in the suspension or each unit heater is more than adequate for the job. Failure to do so may result in extensive property damage, personal injury or death.

Figure 3 - Recommended Design for Field Installation of Ductwork for Straight Through Arrangement

Figure 4 - Recommended Ductwork Design for Elbowed Arrangement

SUSPENSION

The duct furnace must be hung level from side to side and front to back, from four suspension points provided at the top of the unit. Failure to do so will result in poor performance and/or premature failure of the unit. Refer to Figure 5 for typical suspension arrangements. DO NOT mount duct furnaces in series (one in front of another).

NOTICE: When mounting duct furnaces side by side, units must have opposite side gas connections (determined by Digit #6 - Furnace Type in the unit number). Minimum safety clearances must also be maintained; see T able 3. When service/accessibility c learances are greater than minimum safety c learances, service/accessibility clearances take precedence. See “Accessibility” section under “Installation”.

Figure 5

"S"

NOTE: WHEN TWO UNITS ARE JOINED SIDE BY SIDE IN THE FIELD A SOLID PIECE OF SHEET METAL MUST BE PROVIDED BY THE INSTALLER AT THE BACK OF ADJACENT CENTER FLANGES, FRONT AND REAR.

METHODS USED TO LIFT THE UNIT HEATER ARE CAPABLE OF SUPPORTING THE WEIGHT OF THE HEATER DURING INSTALLATION. FAILURE TO HEED THIS WARNING MAY RESULT IN PROPERTY DAMAGE OR PERSONAL INJURY.

MAKE CERTAIN THAT THE LIFTING

D9193

FURNACE IS T O BE MOUNTED IS CAP ABLE OF SAFELY SUPPORTING ITS WEIGHT. UNDER NO CIRCUMST ANCES MUST THE GAS LINES, VENTING SYSTEM OR THE ELECTRICAL CONDUIT BE USED TO SUPPORT THE HEATER OR ANY OTHER OBJECTS (I.E. LADDER, PERSON) LEAN AGAINST THE HEATER GAS LINES, VENTING SYSTEM OR ELECTRICAL CONDUIT FOR SUPPORT. FAILURE T O HEED THESE WARNINGS MAY RESULT IN PROPER TY DAMA GE, PERSONAL INJURY OR DEATH.

MAKE CERTAIN THAT THE STRUCTURE TO WHICH THE

ELECTRICAL CONNECTIONS

HAZARDOUS VOL TAGE!

DISCONNECT ALL ELECTRIC POWER INCLUDING REMOTE DISCONNECTS BEFORE SERVICING. Failure to disconnect power before servicing can cause severe personal injury or death.

Standard units are shipped for use on 115 volt, 60 hertz single phase electric power. The motor name-plate and electrical rating on the transformer should be checked before energizing the duct furnace electrical system. All external wiring must conform to the latest edition of ANSI/ NFPA No. 70, National Electrical Code and applicable local codes; in Canada, to the Canadian Electrical Code, Part 1 CSA Standard C22.1.

Do not use any tools (i.e. screwdriver, pliers, etc.) across the terminals to check for power. Use a voltmeter.

USE COPPER CONDUCTORS ONLY! UNIT TERMINALS ARE NOT DESIGNED TO ACCEPT OTHER TYPES OF CONDUCTORS. Failure to do so may cause damage to the equipment.

It is recommended that the electrical power supply to each duct furnace be provided by a separate, fused and permanently live electrical circuit. A disconnect s witch of suitable electrical rating for each duct furnace should be located as close to the gas valve and controls as possib le. Each duct furnace must be electrically grounded in accordance with the latest edition of the National Electric Code, ANSI/NFPA No. 70 or CSA Standard C22.1.

THERMOSTAT WIRING AND LOCATION

NOTICE: The thermostat must be mounted on a vertical vibration-free surface free from air currents and in accordance with the furnished instructions.

Mount the thermostat approximately 5 feet (1.5 m) abov e the floor in an area where it will be exposed to a free circulation of average temperature air . Alwa ys refer to the thermostat instructions as well as our unit wiring diagram and wire accordingly. Avoid mounting the thermostat in the following locations:

1. Cold areas - Outside w alls or areas where drafts may

affect the operation of the control.

2. Hot areas - Areas where the sun's rays, radiation, or

warm air currents may affect control operation.

3. Dead areas - Areas where air cannot circulate freely ,

such as behind doors or in corners.

* Thermostat wires tagged “W” and “G” must be connected together except when using a general purpose “SPDT” 24VAC relay and a standard thermostat with subbase, or when using Honeywell T834H or T834N thermostats. Also refer to wiring diagram (factory provided with each unit) for other wiring connections.

Figure 6 - C1267G

THERMOSTAT HEAT ANTICIP ATOR ADJUSTMENTS:

The initial heat anticipator setpoint should equal the heater control circuit's current (amperage) draw when the unit is ﬁ ring. This current should be measured for the best results. Use the recommended ranges as a guide. If further information is needed, consult your thermostat manufacturer's instructions.

Recommended Heat Anticipator Setting Ranges:

25 ft. (7.6m) 50 ft. (15.2m) Gas Ignition Type T'stat Wiring T'stat Wiring

For Power Vented Units: Intermittent (Spark) 0.85 to 0.90 A 0.90 to 1.1 A Max. Setting on T'stat

FAN TIME DELAY CONTROL

Leads from time delay controls are factory wired to the junction box (when ordered as an optional component). The fan control is a time delay relay (approximately 45 seconds ON, 65 seconds OFF). The fan control is rated at 17 amps.

NOTICE: The start-up fan delay must not exceed 90 seconds from a cold start.

NOTICE: For all wiring connections, refer to the wiring diagram that your unit is equipped with (either afﬁ xed to the side jacket or enclosed in your unit's installation instruction envelope). Should any original wire supplied with the heater have to be replaced, it must be replaced with wiring material having a temperature rating of at least 105° C.

Should any high limit switch wires have to be replaced, they must be replaced with wiring material having a temperature rating of 200°C minimum.

VENTING

ANSI now organizes vented appliances into four categories.

Category I

Includes non-condensing appliances with negative vent

Venting Categories

Non Condensing Condensing Negative Vent I II Pressure

Positive Vent III IV Pressure

pressure, like the traditional atmospheric unit heater.

Category II

Groups condensing appliances with negative vent pressure.

Category III

Appliances are non-condensing and operate with a positive vent pressure.

Category IV

Covers condensing appliances with positive vent pressure.

NOTICE: Categor y II and IV do not apply to equipment speciﬁ ed within this manual.

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