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1. Safe Installation Requirements

Installation or repairs made by unqualified persons

can result in hazards to you and others. Installation

MUST conform with local codes or, in the absence

of local codes, with codes of all governmental

authorities having jurisdiction.
The information contained in this manual is

intended for use by a qualified service technician

who is experienced in such work, who is familiar

with all precautions and safety procedures required

in such work, and is equipped with the proper tools

and test instruments.
Failure to carefully read and follow all instructions

in this manual can result in furnace malfunction,

death, personal injury and/or property damage.

!

NOTE

: This furnace is design certified by the American Gas

Association and the Canadian Gas Association for installation in

the United States and Canada. Refer to the appropriate codes,

along with this manual, for proper installation.

·

Use only the Type of gas approved for this furnace (see

Rating Plate

on unit). Overfiring will result in failure of heat

exchanger and cause dangerous operation. (Furnaces

can be converted to L.P. gas with approved kit.)

·

Install this furnace only in a location and position as speci-

fied in “

Installation”

of these instructions.

·

Provide adequate combustion and ventilation air to the

furnace as specified in “

Combustion and Ventilation Air”

of

these instructions.

·

Combustion products must be discharged outdoors. Con-

nect this furnace to an approved vent system only, as spe-

cified in “

Combustion and Ventilation Air”

of these

instructions.

·

Never test for gas leaks with an open flame. Use a com-

mercially available soap solution made specifically for the

detection of leaks to check all connections, as specified in

Gas Supply and Piping”

of these instructions.

·

Always install furnace to operate within the furnace’s in-

tended temperature--rise range with a duct system which

has an external static pressure within the allowable rat-

ings, as specified in “

Technical Support Specifications”

of

these instructions.

·

When a furnace is installed so that supply ducts carry air

circulated by the furnace to areas outside the space con-

taining the furnace, the return air shall also be handled by

duct(s) sealed to the furnace casing and terminating out-

side the space containing the furnace.

·

A gas--fired furnace for installation in a residential garage

must be installed as specified in “

Installation Require-

ments”

of these instructions.

·

This furnace is not to be used for temporary heating of

buildings or structures under construction.

·

This furnace is NOT approved for installation in mo-

bile homes, trailers or recreation vehicles.

·

Seal around supply and return air ducts.

·

Install correct filter type and size.

·

Unit

MUST

be installed so electrical components are pro-

tected from direct contact with water.

Safety Rules

Your unit is built to provide many years of safe and dependable

service providing it is properly installed and maintained. However,

abuse and/or improper use can shorten the life of the unit and

create hazards for you, the owner.
A. The U.S. Consumer Product Safety Commission recom-

mends that users of gas--burning appliances install carbon

monoxide detectors. There can be various sources of carbon

monoxide in a building or dwelling. The sources could be

gas--fired clothes dryers, gas cooking stoves, water heaters,

furnaces, gas--fired fireplaces, wood fireplaces, and several

other items. Carbon monoxide can cause serious bodily inju-

ry and/or death. Therefore, to help alert people of potentially

dangerous carbon monoxide levels, you should have carbon

monoxide detectors listed by a nationally recognized agency

(e.g. Underwriters Laboratories or International Approval

Services) installed and maintained in the building or dwelling

(see Note below).

B. There can be numerous sources of fire or smoke in a building

or dwelling. Fire or smoke can cause serious bodily injury,

death, and/or property damage. Therefore, in order to alert

people of potentially dangerous fire or smoke, you should

have fire extinguisher and smoke detectors listed by Under-

writers Laboratories installed and maintained in the building

or dwelling (see Note below).

Note:

The manufacturer of your furnace does not test any detec-

tors and makes no representations regarding any brand or

type of detector.

C. To ensure safe and efficient operation of your unit, you should

do the the following:

1.

Thoroughly read this manual and labels on the unit.

This

will help you understand how your unit operates and the haz-

ards involved with gas and electricity.

2.

Do not use this unit if any part has been under water.

Im-

mediately call a qualified service technician to inspect the unit

and to replace any part of the control system and any gas

control which has been under water.

3.

Never obstruct the vent grilles, or any ducts that provide

air to the unit.

Air must be provided for proper combustion

and ventilation of flue gases.
Carbon monoxide or “CO” is a colorless and odorless gas

produced when fuel is not burned completely or when the

flame does not receive sufficient oxygen.

Frozen Water Pipe Hazard

FROZEN AND BURST WATER PIPE HAZARD
FaiIure to do so may result in burst water pipes, serious

property damage and/or personal injury.
Furnace may shut down. Do not leave your home

unattended for long periods during freezing weather

without turning off water supply and draining water

pipes or otherwise protecting against the risk of frozen

pipes.

!

Your furnace is designed solely to provide a safe and comfortable

living environment. The furnace is NOT designed to ensure that

water pipes will not freeze. It is equipped with several safety de-

vices that are designed to turn the furnace off and prevent it from

restarting in the event of various potentially unsafe conditions.
If your furnace remains off for an extended time, the pipes in your

home could freeze and burst, resulting in serious water damage.

Summary of Contents for H8UH5050B12

Page 1: ...nel can perform basic maintenance functions such as cleaning and replacing air filters All other operations must be performed by trained service personnel When working on heating equipment observe precautions in the literature on tags and on labels attached to or shipped with the unit and other safety precautions that may apply Follow all safety codes In the United States follow all safety codes i...

Page 2: ...of Supply Air F or C Temperature of Return Air F or C Rise Supply Temp Return Temp F or C Filter Type and Size Fan Time ON Setting Fan Time OFF Setting Manual Gas Shut Off Upstream of Furnace Drip Leg YES NO Drip Leg Upstream of Gas Valve YES NO Blower Speed Checked YES NO All Electrical Connections Tight YES NO Gas Valve OK YES NO Measured Line Pressure When Firing Unit Calculated Firing Rate See...

Page 3: ...lt to provide many years of safe and dependable service providing it is properly installed and maintained However abuse and or improper use can shorten the life of the unit and create hazards for you the owner A The U S Consumer Product Safety Commission recom mends that users of gas burning appliances install carbon monoxide detectors There can be various sources of carbon monoxide in a building ...

Page 4: ...e necessary to resize the existing vent line and chimney to prevent oversizing problems for the other remaining appliances s See applicable codes and Venting and Combustion Air Check and Gas Vent Installation section Location and Clearances If furnace is a replacement it is usually best to install the furnace where the old one was Choose the location or evaluate the exist ing location based upon t...

Page 5: ...RONT 3 Recommended For Service 30 ALL SIDES Of SUPPLY PLENUM 1 SIDES 0 VENT Single Wall Vent 6 Type B 1 Double Wall Vent 1 TOP OF FURNACE 1 Horizontal position Line contact is permissible only between lines formed by intersections of top and two sides of furnace jacket and building joists studs or framing DIMENSIONAL INFORMATION Unit Cabinet Top Bottom Unit Capacity A B F C D H8UH5050B12 H8UH5075B...

Page 6: ...nd ventilation air can result in death and or personal injury Use methods described here to provide combus tion and ventilation air Furnaces require ventilation openings to provide sufficient air for proper combustion and ventilation of flue gases All duct or open ingsforsupplyingcombustion andventilation airmustcomplywith the gas codes or in the absence of local codes the applicable na tional cod...

Page 7: ...re 1 square inch of free area per4 000 BTUHfor combined input of all gas appliances in area see Table 1 One permanent opening commencing within 12 of the top of the enclosure shall be permitted where the equipment has clear ances ofatleast1 fromthe sides and back and 6 fromthe frontof the appliance The opening shall directly communicate with the outdoors or shall communicate through a vertical or ...

Page 8: ...this furnace can result in death personal injury and or property damage Install the vent in compliance with codes of the country having ju risdiction local codes or ordinances and these instructions These fan assisted combustion furnaces have been classified as Category I appliances which means that they MUST operate with a negative vent pressure Category I Safe Venting Requirements NOTE The follo...

Page 9: ...icates sufficient infiltration air Venting to Existing Masonry Chimney NOTE The tables and notes referred to below are found in the most recent printing of the United States National Fuel Gas Code venting tables Use the United States National Fuel Gas Code or NFGC Tables to size the chimney orvent Dedicatedventing ofone fanassisted furnace into any masonry chimney is restricted The chimney must fi...

Page 10: ...for installations below 2000 in altitude Table 3 Orifice Sizes below 2000 Gas Type Manifold Pressure Specific Gravity Heating Value BTU per Cubic Ft Orifice Size Drill Natural 3 5 w c 800 40 3 5 w c 0 9kP 0 6 900 41 0 9kPa w c 0 6 1000 42 w c 1100 43 Propane 10 w c 2 5kPa w c 1 53 2500 54 Operation Above 2000 Altitude FIRE EXPLOSION CARBON MONOXIDE POISON ING HAZARD This conversion shall be done b...

Page 11: ...FERENT SPECIFIC GRAVITY CONSULT THE LATEST EDITION OF THE NATIONAL FUEL GAS CODE ANSI Z223 1 and CAN B149 NOTE The derating of these units at 2 Natural and 4 L P has been tested and approved by AGA High Altitude Air Pressure Switch Altitudes over 4 000 require a different air pressure switch than the one installed at thefactory Check parts list for pressure switch and consult your distributor for ...

Page 12: ...vide a 1 8 inch plug for test gauge connection immediate ly up stream of gas supply connection to furnace 7 Use two pipe wrenches when making connections to prevent gas valve from turning Typical Gas Piping Figure 8 25 24 35a Union Manual Valve Drip leg pipe cap left side entry 8 Flexible corrugated metal gas connector may NOT be used inside the furnace or be secured or supported by the furnace or...

Page 13: ...s Fieldwiringconnectionsmustbemadeinsidethefurnaceconnec tion box A suitable strain relief should be used at the point the wires exit the furnace casing Copper conductors shall be used Line voltage wires should be sized for the input amps stated on the rating plate Furnace must be connected to its own separate circuit Thermostat Thermostat location has an important effect on the operation of the u...

Page 14: ...bjectionable when the unitis located very close to a living area Itis often advisable to route the return air ducts under the floor or through the attic Refer to furnace Technical Support Manual Blower Data for air flow information Size ductwork to handle air flow for heating and air condition ing if used Duct Installation Requirements When furnace supply ducts carry air outside furnace area seal ...

Page 15: ...e high velocity filter providing they meet the minimum size areas Washable high velocity filters can be replaced ONLY with same type and size 2 5 2 0 3 1 Figure 12 Optional Duct Standoff 20 x 25 Optional Filter Rack Filter Installation using Optional Filter Rack When installing or removing a bottom mounted filter slide the two side filter clips to the back of the furnace BEFORE installing or re mo...

Page 16: ...Blower Speed ELECTRICAL SHOCK HAZARD Failure to do so can result in death personal injury and or property damage Turn OFF power to furnace before changing speed taps NOTE The speed taps that the manufacture sets from the factory for this product are based on a nominal 400 CFM per ton cooling and the basic mid range on the temperature rise for heating Since the manufacturer cannot establish the sta...

Page 17: ...s removed from EFT Cool motor speed de energized after 90 second Cool Fan Off Delay time Circulating Fan G Request 24 VAC signals applied to G terminals of EFT control Heat motor speed energized without delay G signal removed from EFT Heat motor speed de energized without delay NOTE 1 Furnaces with PSC blower motors de energize the Low Heat fan speed during the heat exchanger warm up period on a c...

Page 18: ...ry count exceeded failed to light within 4 trials for ignition 6 Flashes 2 Notes 1 2 Soft Lockout Maximum recycle count exceeded Last failure was Flame Sense Lost During Run Cycling Pressure Switch or Blocked Condensate 6 Flashes 3 Notes 1 2 Soft Lockout Maximum recycle count exceeded Last failure was Airflow Proving Circuit Opened During Run 6 Flashes 4 Notes 1 2 Soft Lockout Maximum recycle coun...

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