background image

272312-UIM-A-0407

28

Unitary Products Group

NOTES

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

3

/min).

2. Motor voltage at 115 V.

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

TABLE 17: 

Blower Performance CFM - Upflow (without filter) - Bottom Return

MODELS

Input / 

CFM

Speed

Bottom Airflow Data (SCFM)

Bottom 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

1610 1540 1460 1360 1290 1200 1110 1020 900

760

45.6 43.6 41.3 38.5 36.5 34.0 31.4 28.9 25.5 21.5

Medium High 1430 1390 1330 1250 1190 1110 1030 940

840

710

40.5 39.4 37.7 35.4 33.7 31.4 29.2 26.6 23.8 20.1

Medium Low 1200 1180 1140 1100 1050 1000 930

850

750

620

34.0 33.4 32.3 31.1 29.7 28.3 26.3 24.1 21.2 17.6

Low

980

980

960

920

890

840

790

720

620

530

27.8 27.8 27.2 26.1 25.2 23.8 22.4 20.4 17.6 15.0

60/1200/A

 

High

1570 1490 1420 1340 1250 1180 1090 990

870

700

44.5 42.2 40.2 37.9 35.4 33.4 30.9 28.0 24.6 19.8

Medium High 1410 1360 1310 1250 1190 1090 1020 920

810

650

39.9 38.5 37.1 35.4 33.7 30.9 28.9 26.1 22.9 18.4

Medium Low 1200 1180 1150 1100 1050 990

920

830

700

580

34.0 33.4 32.6 31.1 29.7 28.0 26.1 23.5 19.8 16.4

Low

960

960

950

930

900

840

800

720

610

500

27.2 27.2 26.9 26.3 25.5 23.8 22.7 20.4 17.3 14.2

80/1200/A

 

High

1590 1520 1460 1380 1300 1240 1150 1050 930

800

45.0 43.0 41.3 39.1 36.8 35.1 32.6 29.7 26.3 22.7

Medium High 1400 1360 1310 1260 1200 1140 1070 960

860

740

39.6 38.5 37.1 35.7 34.0 32.3 30.3 27.2 24.4 21.0

Medium Low 1180 1160 1130 1090 1040 990

920

840

750

640

33.4 32.8 32.0 30.9 29.4 28.0 26.1 23.8 21.2 18.1

Low

940

940

940

920

880

840

790

710

630

530

26.6 26.6 26.6 26.1 24.9 23.8 22.4 20.1 17.8 15.0

80/1600/B

 

High

1850 1820 1790 1750 1690 1630 1570 1500 1430 1330

52.4 51.5 50.7 49.6 47.9 46.2 44.5 42.5 40.5 37.7

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 31.4 30.3 28.6

80/1600/C

High

2077 1992 1922 1830 1727 1617 1507 1355 1219 1050

58.8 56.4 54.4 51.8 48.9 45.8 42.6 38.3 34.5 29.7

Medium

1729 1673 1631 1581 1507 1421 1293 1187 1053 907

48.9 47.3 46.2 44.7 42.6 40.2 36.6 33.6 29.8 25.7

Low

1448 1452 1432 1390 1324 1264 1176 1058 939

774

41.0 41.1 40.5 39.3 37.5 35.8 33.3 29.9 26.6 21.9

100/1200/B  

High

1700 1620 1560 1480 1390 1300 1210 1110 970

820

48.1 45.9 44.2 41.9 39.4 36.8 34.3 31.4 27.5 23.2

Medium High 1430 1400 1350 1300 1230 1160 1080 980

870

710

40.5 39.6 38.2 36.8 34.8 32.8 30.6 27.8 24.6 20.1

Medium Low 1180 1170 1160 1130 1080 1030 1000 860

750

510

33.4 33.1 32.8 32.0 30.6 29.2 28.3 24.4 21.2 14.4

Low

950

950

930

920

880

840

790

720

620

530

26.9 26.9 26.3 26.1 24.9 23.8 22.4 20.4 17.6 15.0

100/2000/C

  

High

2590 2500 2400 2280 2180 2080 1970 1840 1720 1560

73.3 70.8 68.0 64.6 61.7 58.9 55.8 52.1 48.7 44.2

Medium High 2180 2120 2040 1980 1900 1810 1720 1600 1480 1320

61.7 60.0 57.8 56.1 53.8 51.3 48.7 45.3 41.9 37.4

Medium Low 1750 1720 1680 1640 1580 1520 1440 1350 1220 1060

49.6 48.7 47.6 46.4 44.7 43.0 40.8 38.2 34.5 30.0

Low

1450 1420 1380 1330 1300 1240 1160 1070 970

860

41.1 40.2 39.1 37.7 36.8 35.1 32.8 30.3 27.5 24.4

120/1600/C  

High

2020 1930 1820 1730 1640 1540 1400 1250 1090 920

57.2 54.7 51.5 49.0 46.4 43.6 39.6 35.4 30.9 26.1

Medium

1750 1710 1650 1590 1490 1390 1290 1160 1010 810

49.6 48.4 46.7 45.0 42.2 39.4 36.5 32.8 28.6 22.9

Low

1540 1500 1460 1410 1350 1260 1180 1060 910

750

43.6 42.5 41.3 39.9 38.2 35.7 33.4 30.0 25.8 21.2

120/2000/C

 

High

2500 2400 2320 2220 2110 2000 1870 1750 1610 1450

70.8 68.0 65.7 62.9 59.7 56.6 53.0 49.6 45.6 41.1

Medium High 2130 2070 1990 1920 1840 1760 1660 1570 1460 1320

60.3 58.6 56.4 54.4 52.1 49.8 47.0 44.5 41.3 37.4

Medium Low 1700 1680 1650 1620 1560 1500 1410 1320 1210 1070

48.1 47.6 46.7 45.9 44.2 42.5 39.9 37.4 34.3 30.3

Low

1420 1390 1360 1330 1290 1240 1150 1060 950

840

40.2 39.4 38.5 37.7 36.5 35.1 32.6 30.0 26.9 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...

Reviews: