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13

441 01 5001 00

·

Two--stage regulation of LP gas is recommended.

Final Check

·

Test all pipe for leaks.

·

If orifices where changed, make sure they are checked for

leaks.

·

During pressure testing of gas piping system, observe the fol-

lowing:

a. If test pressure does not exceed

1

/

2

²

PSIG, isolate the fur-

nace by closing its individual manual shutoff valve.

b. If test pressure exceeds

1

/

2

²

PSIG, the furnace and its indi-

vidual shutoff valve must be disconnected from the gas sup-

ply system.

·

To check for leaks apply soap suds or a liquid detergent to

each joint. Bubbles forming indicate a leak.

·

Do not use an open flame to test for gas leaks. Fire or explo-

sion could occur.

·

Correct even the smallest leak at once.

FIRE OR EXPLOSION HAZARD.
Liquid petroleum (LP) gas is heavier than air and

will settle and remain in low areas and open

depressions.
An open flame or spark can result in death, personal

injury and/or property damage.
Thoroughly ventilate area and dissipate gas. Do

NOT use a match or open flame to test for leaks, or

attempt to start up furnace before thoroughly

ventilating area.

!

7. Electrical Wiring

Electrical shock hazard.
Turn OFF electrical power at fuse box or service

panel before making any electrical connections

and ensure a proper ground connection is made

before connecting line voltage.
Failure to do so can result in death, personal injury

and/or property damage.

!

Power Supply Wiring

The furnace

MUST

be electrically wired and grounded in accor-

dance with local codes, or in the absence of local codes, the appli-

cable national codes.

Field wiring connections must be made inside the furnace connec-

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 unit. Follow instructions included with thermostat for correct

mounting and wiring.

Low voltage connections to furnace must be made on terminal

board to fan control. (See

Figure 9

)

If cooling is used, the

Y

from the thermostat must be connected to

the control board

Y

to energize cooling blower speed.

Set thermostat heat anticipator in accordance with the

Technical

Support Manual

.

Optional Equipment

All wiring from furnace to optional equipment

MUST

conform to lo-

cal codes or, in the absence of local codes, the applicable national

codes. Install wiring in accordance with manufacturer’s instruc-

tions.

Humidifier/Electronic Air Cleaner

The furnace is wired for humidifier and/or electronic air cleaner

connection.

CAUTION

Do NOT exceed 220V/0.4 amp. maximum current load

for both the EAC terminal and the HUM terminal com-

bined.

NOTE:

The humidifier will be powered when the furnace is fired

and the circulating air blower comes on. The electronic air cleaner

will be powered anytime the thermostat calls for air movement.

However, the electronic air cleaner is

NOT

energized during con-

tinuous fan operation controlled by the electronic fan control.

Figure 9

Electrical Connections

25--24--33

NOTE: 220 VAC/50Hz/single--phase

Operating voltage range*: 242 max, 198 min.

* Permissible limits of voltage at which unit will operate satisfactorily

220V/50Hz.

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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