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272312-UIM-A-0407

Unitary Products Group

29

NOTES

1. Airflow expressed in standard cubic feet per minute (CFM) and in cubic meters per minute (m

3

/min).

2. Return air is through side opposite motor (left side).

3. Motor voltage at 115 V.

4. Airflow through motor side return (right side) maybe slightly less than shown above.

* Input / CFM / Cabinet Width (A=14-1/2, B=17-1/2, C=21, D=24-1/2)
† Indicates model available in LoNOx.

TABLE 18: 

Blower Performance CFM - Upflow (without filter) - Left Side Return

MODELS

Input / 

CFM

Speed

Left Side Airflow Data (SCFM)

Left Side Airflow Data (cm/m)

Ext. Static Pressure (in. H2O)

Ext. Static Pressure (kPa)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0.025 0.050 0.075 0.100 0.125 0.149 0.174 0.199 0.224 0.249

40/1200/A

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

Medium High 1390 1390 1350 1320 1270 1210 1150 1080 970

790

39.4 39.4 38.2 37.4 36.0 34.3 32.6 30.6 27.5 22.4

Medium Low 1120 1120 1120 1110 1080 1080 1020 930

830

690

31.7 31.7 31.7 31.4 30.6 30.6 28.9 26.3 23.5 19.5

Low

880

910

920

920

910

870

820

740

650

510

24.9 25.8 26.1 26.1 25.8 24.6 23.2 21.0 18.4 14.4

60/1200/A

High

1770 1690 1630 1560 1490 1390 1290 1190 1050 920

50.1 47.9 46.2 44.2 42.2 39.4 36.5 33.7 29.7 26.1

Medium High 1400 1380 1350 1320 1280 1230 1160 1060 930

780

39.6 39.1 38.2 37.4 36.2 34.8 32.8 30.0 26.3 22.1

Medium Low 1120 1130 1150 1130 1120 1080 1000 950

790

630

31.7 32.0 32.6 32.0 31.7 30.6 28.3 26.9 22.4 17.8

Low

880

900

900

900

880

850

790

730

660

530

24.9 25.5 25.5 25.5 24.9 24.1 22.4 20.7 18.7 15.0

80/1200/A

High

1790 1720 1670 1590 1530 1450 1350 1260 1140 1000

50.7 48.7 47.3 45.0 43.3 41.1 38.2 35.7 32.3 28.3

Medium High 1420 1370 1350 1320 1280 1230 1170 1090 990

840

40.2 38.8 38.2 37.4 36.2 34.8 33.1 30.9 28.0 23.8

Medium Low 1080 1120 1110 1100 1080 1040 1000 920

820

690

30.6 31.7 31.4 31.1 30.6 29.4 28.3 26.1 23.2 19.5

Low

N/A

900

900

890

870

850

800

730

670

560

N/A 25.5 25.5 25.2 24.6 24.1 22.7 20.7 19.0 15.9

80/1600/B

High

2000 1960 1930 1900 1800 1760 1710 1640 1550 1460

56.6 55.5 54.7 53.8 51.0 49.8 48.4 46.4 43.9 41.3

Medium

1440 1440 1430 1420 1400 1380 1340 1300 1220 1150

40.8 40.8 40.5 40.2 39.6 39.1 37.9 36.8 34.5 32.6

Low

1220 1230 1230 1230 1200 1190 1170 1160 1110 1050

34.5 34.8 34.8 34.8 34.0 33.7 33.1 32.8 31.4 29.7

80/1600/C

High

2172 2101 2028 1943 1854 1732 1621 1503 1344 1144

61.5 59.5 57.4 55.0 52.5 49.0 45.9 42.5 38.0 32.4

Medium

1640 1633 1626 1584 1518 1480 1378 1276 1125 965

46.4 46.2 46.0 44.8 43.0 41.9 39.0 36.1 31.8 27.3

Low

1388 1404 1412 1396 1362 1311 1222 1144 1001 827

39.3 39.7 40.0 39.5 38.5 37.1 34.6 32.4 28.3 23.4

100/1200/B

High

1780 1710 1640 1560 1490 1390 1290 1180 1030 820

50.4 48.4 46.4 44.2 42.2 39.4 36.5 33.4 29.2 23.2

Medium High 1430 1410 1370 1340 1280 1220 1140 1040 890

730

40.5 39.9 38.8 37.9 36.2 34.5 32.3 29.4 25.2 20.7

Medium Low 1140 1170 1150 1120 1080 1040 970

890

760

630

32.3 33.1 32.6 31.7 30.6 29.4 27.5 25.2 21.5 17.8

Low

920

940

950

940

920

890

850

770

660

560

26.1 26.6 26.9 26.6 26.1 25.2 24.1 21.8 18.7 15.9

100/2000/C

High

2770 2670 2610 2540 2450 2340 2210 2070 1890 1730

78.4 75.6 73.9 71.9 69.4 66.3 62.6 58.6 53.5 49.0

Medium High 2120 2060 2030 2000 1950 1880 1810 1720 1580 1370

60.0 58.3 57.5 56.6 55.2 53.2 51.3 48.7 44.7 38.8

Medium Low 1690 1660 1630 1610 1560 1490 1420 1350 1240 1070

47.9 47.0 46.2 45.6 44.2 42.2 40.2 38.2 35.1 30.3

Low

1390 1370 1330 1290 1250 1200 1120 1010 910

850

39.4 38.8 37.7 36.5 35.4 34.0 31.7 28.6 25.8 24.1

120/1600/C

High

2160 2070 1990 1900 1800 1690 1580 1430 1260 1000

61.2 58.6 56.4 53.8 51.0 47.9 44.7 40.5 35.7 28.3

Medium

1760 1720 1690 1630 1560 1480 1390 1250 1080 890

49.8 48.7 47.9 46.2 44.2 41.9 39.4 35.4 30.6 25.2

Low

1510 1490 1470 1440 1380 1300 1210 1110 950

780

42.8 42.2 41.6 40.8 39.1 36.8 34.3 31.4 26.9 22.1

120/2000/C

High

2740 2650 2560 2480 2380 2280 2170 1990 1840 1650

77.6 75.0 72.5 70.2 67.4 64.6 61.4 56.4 52.1 46.7

Medium High 2120 2090 2040 2000 1940 1870 1780 1680 1550 1370

60.0 59.2 57.8 56.6 54.9 53.0 50.4 47.6 43.9 38.8

Medium Low 1690 1670 1650 1610 1560 1510 1440 1310 1160 1030

47.9 47.3 46.7 45.6 44.2 42.8 40.8 37.1 32.8 29.2

Low

1390 1360 1330 1300 1250 1190 1100 1020 940

840

39.4 38.5 37.7 36.8 35.4 33.7 31.1 28.9 26.6 23.8

Summary of Contents for AHT8-UH

Page 1: ...RING DIAGRAM 30 LIST OF FIGURES 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...

Page 2: ...s from combustible materials as listed under Clearances to Combustibles in Table 1 Provide clearances for servicing ensuring that service access is allowed for both the burners and blower These models...

Page 3: ...d Never store items such as the following on near or in contact with the fur nace 1 Spray or aerosol cans rags brooms dust mops vacuum cleaners or other cleaning tools 2 Soap powders bleaches waxes or...

Page 4: ...t the specified external static pressure and within the air temperature rise specified on the nameplate Table 2 is a guide for determining whether the rectangular duct system that the furnace is being...

Page 5: ...plenum On all installations without a coil a removable access panel is recommended in the outlet duct such that smoke or reflected light would be observable inside the casing to indi cate the presenc...

Page 6: ...essibility IMPORTANT If an external mounted filter rack is being used see the instructions provided with that accessory for proper hole cut size HORIZONTAL MODELS IMPORTANT This furnace may be install...

Page 7: ...removed and a new plenum installed that is the proper size for the new furnace Attach the return plenum to the furnace inlet duct flanges This is typi cally through the use of S cleat material when a...

Page 8: ...fer to Table 15 SECTION IV GAS PIPING GAS SAFETY IMPORTANT Plan your gas supply before determining the correct gas pipe entry Use 90 degree service elbow s or short nipples and con ventional 90 degree...

Page 9: ...e gas valve body is a very thin casting that cannot take any external pressure Never apply a pipe wrench to the body of the gas valve when installing piping A wrench must be placed on the octag onal h...

Page 10: ...o the proper gas orifice size when the furnace is installed Do not attempt to drill out any orifices to obtain the proper orifice size Drilling out a gas orifice will cause misalignment of the burner...

Page 11: ...ty is corrected Refer to FURNACE DIAGNOSTICS section of the User s Information Maintenance Service Manual provided with this furnace for symptoms of reversed power supply polarity LOW VOLTAGE CONTROL...

Page 12: ...lt Common is optional when used with batteries Thermostat Installer Setup Number 1 System Type must be set to 6 2 Heat 2 Cool Conventional R 24 Volt Hot Heat XFMR W2 Second Stage Heat RC 24 Volt Hot C...

Page 13: ...BSG Bonnet Sensor Bonnet Sensor Optional BS Bonnet Sensor W2 Second Stage Auxiliary Heat W2 Second Stage Auxiliary Heat AUX Auxiliary Heat E W1 First Stage Auxiliary Heat E W1 First Stage Auxiliary H...

Page 14: ...gas supplies must be provided as specified with these instruc tions Since the furnaces are side by side with no space between gas supplies must enter on the right and left respectively All gas piping...

Page 15: ...wers will come on in the selected continuous fan speed and will stay on until the G signal is removed SECTION VI VENT SYSTEM VENT SAFETY This Category I furnace is designed for residential application...

Page 16: ...ese instructions Approved Modular Homes must be vented with an approved roof jack and may not be common vented with other appliances VENTING Category I venting consists of vertically venting one or mo...

Page 17: ...se masonry chimney kits 3 The chimney must extend at least three 3 ft 0 91 cm above the highest point where it passes through a roof of a building and at least two 2 feet higher than any portion of th...

Page 18: ...tion should be located where it will not be affected by wind gusts light snow airborne leaves or allow recirculation of flue gases 4 Termination should be located where it will not be damaged or expos...

Page 19: ...anufacturer s instructions Dampers Louvers and Grilles Canada Only 1 The free area of a supply air opening shall be calculated by sub tracting the blockage area of all fixed louvers grilles or screens...

Page 20: ...horizontally from the burner level of the appliance Refer to COMBUSTION AIR SOURCE FROM OUTDOORS and VENT AND SUPPLY AIR SAFETY CHECK in these instructions for additional information and safety check...

Page 21: ...mounted on the burner assembly If the temperature around the burner exceeds the set point the ignition control and the gas valve are de energized The operation of this control indicates a malfunction...

Page 22: ...m Source 1 which has the following items 1 12 30 cm length x 1 8 0 3 cm diameter tubing 2 pieces of 4 10 cm length 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...

Page 23: ...at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 0 10 m3 of gas from the gas meter For Propane LP Gas mul...

Page 24: ...h low and high have been calibrated at the factory Additional pressure adjustment should not be necessary If adjustment is necessary set to the following specifications After adjustment check for gas...

Page 25: ...eration Start the system by setting the thermostat above the room temperature Observe the system s response Then use the troubleshooting section in this manual to check the system s operation FURNACE...

Page 26: ...mit switch has opened its normally closed contacts and has remained open for more than five minutes This condition is usually caused by a failed blower motor or blower wheel 12 RED FLASHES This code i...

Page 27: ...the difference in ESP values in the table 0 60 w c 150 Pa 0 50 w c 125 Pa to obtain a percentage 0 58 0 50 0 60 0 50 0 8 Multiply percentage by airflow difference to obtain airflow reduction 0 8 X 70...

Page 28: ...50 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 4 30 3 28 6 80...

Page 29: ...640 1550 1460 56 6 55 5 54 7 53 8 51 0 49 8 48 4 46 4 43 9 41 3 Medium 1440 1440 1430 1420 1400 1380 1340 1300 1220 1150 40 8 40 8 40 5 40 2 39 6 39 1 37 9 36 8 34 5 32 6 Low 1220 1230 1230 1230 1200...

Page 30: ...272312 UIM A 0407 30 Unitary Products Group SECTION IX WIRING DIAGRAM FIGURE 31 Wiring Diagram...

Page 31: ...272312 UIM A 0407 Unitary Products Group 31 NOTES...

Page 32: ...t 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 OK Group Drive...

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