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Page 5

ML180UH110E60C PERFORMANCE (Less Filter)

External 

Static 

Pressure 

in. w.g.

Air Volume / Watts at Different Blower Speeds

Bottom Return Air, Side Return Air with Return Air from Both 

Sides or Return Air from Bottom and One Side.

Single Side Return Air

 − Air volumes in 

bold

 (over 1800 cfm) 

require Optional Return Air Base 

and

 field fabricated transition to 

accommodate 20 x 25 x 1 in. air filter in order to maintain proper air 

velocity.

High 

(Black)

Medium-

High 

(Brown)

Medium 

(Blue)

Medium-

Low 

(Yellow)

Low 

(Red)

High 

(Black)

Medium-

High 

(Brown)

Medium 

(Blue)

Medium-

Low 

(Yellow)

Low 

(Red)

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

0.00

2230 635 1945 430 1715 295 1555 230 1470 185

2315 645 1990 415

1780 300 1610 230 1510 200

0.10

2180 655 1905 445 1690 305 1510 240 1340 175

2260 655 1945 425

1740 315 1550 240 1400 185

0.20

2135 680 1865 465 1630 330 1470 260 1280 190

2210 680 1895 450

1680 335 1510 255 1350 200

0.30

2090 695 1830 480 1595 345 1440 275 1235 200

2165 700 1850 465

1650 355 1455 275 1285 210

0.40

2050 715 1785 495 1550 360 1385 285 1175 210

2130 715 1830 485

1585 365 1395 285 1230 225

0.50

2025 730 1740 520 1500 375 1340 300 1130 225

2095 730

1770 500 1535 385 1365 300 1175 235

0.60

2010 750 1710 535 1470 390 1305 320

1080

240

2055 755

1725 515 1495 400 1305 315 1135 250

0.70

1965 755 1670 555 1420 410 1255 330 1015 255

2000 765

1675 535 1465 410 1255 325

1080

265

0.80

1905 785 1635 560 1380 425 1215 350

975

270

1965 785

1640 555 1400 425 1210 345 1025 275

ML180UH090E60C PERFORMANCE (Less Filter)

External 

Static 

Pressure 

in. w.g.

Air Volume / Watts at Different Blower Speeds

Bottom Return Air, Side Return Air from Both Sides or Return 

Air from Bottom and One Side.

Single Side Return Air

 − Air volumes in 

bold

 (over 1800 cfm) 

require Optional Return Air Base 

and

 field fabricated transition to 

accommodate 20 x 25 x 1 in. air filter in order to maintain proper air 

velocity.

High 

(Black)

Medium-

High 

(Brown)

Medium 

(Blue)

Medium-

Low 

(Yellow)

Low 

(Red)

High 

(Black)

Medium-

High 

(Brown)

Medium 

(Blue)

Medium-

Low 

(Yellow)

Low 

(Red)

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

0.00

2255 640 1940 420 1750 310 1580 230 1485 185

2290 655 1980 425

1775 310 1605 235 1495 195

0.10

2200 655 1910 440 1705 315 1535 240 1385 190

2250 675 1945 445

1730 320 1555 245 1400 190

0.20

2150 675 1865 450 1655 340 1490 260 1340 205

2210 695 1885 465

1680 340 1510 265 1350 205

0.30

2125 695 1835 475 1635 355 1450 275 1285 215

2165 715 1850 475

1645 355 1470 275 1285 215

0.40

2090 715

1800

495 1585 370 1405 285 1235 230

2135 720 1810 490

1595 370 1410 290 1225 230

0.50

2060 735 1760 510 1545 385 1370 305 1200 245

2070 735

1765 515 1545 390 1370 305

1180

245

0.60

2020 750 1725 525 1515 405 1320 320 1145 255

2030 760

1715 530 1495 405 1325 320 1140 255

0.70

1980 765 1680 540 1465 420 1265 330 1105 270

1990 775

1685 540 1450 425 1265 330 1095 270

0.80

1935 785 1635 560 1420 435 1225 350 1055 285

1950 795

1645 560 1415 435 1225 345 1040 285

ML180UH135E60D PERFORMANCE (Less Filter)

External 

Static 

Pressure 

in. w.g.

Air Volume / Watts at Different Blower Speeds

Bottom Return Air, Side Return Air with Return Air from Both 

Sides or Return Air from Bottom and One Side.

Single Side Return Air

 − Air volumes in 

bold

 (over 1800 cfm) 

require Optional Return Air Base 

and

 field fabricated transition to 

accommodate 20 x 25 x 1 in. air filter in order to maintain proper air 

velocity.

High 

(Black)

Medium-

High 

(Brown)

Medium 

(Blue)

Medium-

Low 

(Yellow)

Low 

(Red)

High 

(Black)

Medium-

High 

(Brown)

Medium 

(Blue)

Medium-Low 

(Yellow)

Low 

(Red)

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

0.00

2495 755 2295 590 2045 435 1845 315 1650 230

2365 725 2295 575 2005 410 1820 300

1635 235

0.10

2440 780 2220 620 2015 445 1820 330 1615 245

2350 745 2210 595 2000 435

1745 320 1530 230

0.20

2390 790 2175 640 1935 470 1735 350 1550 255

2330 775 2175 625 1945 455

1730 330 1490 250

0.30

2360 805 2140 655 1895 490 1720 370 1485 275

2245 785 2135 645 1895 475

1655 355 1425 265

0.40

2285 835 2125 675 1850 510 1660 380 1455 290

2215 810 2085 660 1840 495

1600 375 1385 285

0.50

2240 860 2060 690 1815 535 1610 400 1415 310

2175 825 2045 680 1815 505

1590 390 1340 290

0.60

2225 865 2015 715 1785 550 1535 420 1330 320

2125 845 1995 700

1765 530 1525 405 1300 310

0.70

2160 895 1955 735 1755 570 1500 440 1265 340

2095 865 1950 710

1700 545 1485 420 1260 325

0.80

2105 905 1925 750 1715 580 1435 450 1215 345

2065 880 1890 725

1680 565 1415 445 1205 345

Summary of Contents for MERIT ML180UH045E36A

Page 1: ...Propane operation ML180UHE X model units are equipped with a hot sur face ignition system The ML180UHE X unit meets the California Nitrogen Oxides NOx Standards and Califor nia Seasonal Efficiency re...

Page 2: ...15 15 Shipping Data lbs 1 package 111 111 127 142 SPECIFICATIONS Gas Heating Performance Model No ML180UH090E60C ML180UH110E60C ML180UH135E60D Model No Low Nox ML180UH110XE60C 1 AFUE 80 80 80 Input B...

Page 3: ...h Altitude Pressure Switch Kit Natural Gas to LPG Propane Kit LPG Propane to Natural Gas Kit Natural Gas High Altitude Orifice Kit 0 4500 ft 4501 7500 ft 7501 10 000 ft 0 7500 ft 7501 10 000 ft 0 7500...

Page 4: ...35 0 70 1190 350 1000 235 855 205 790 190 540 140 0 80 1160 365 925 245 790 205 735 200 445 145 ML180UH070E36A PERFORMANCE Less Filter External Static Pressure in w g Air Volume Watts at Various Blowe...

Page 5: ...0 2255 640 1940 420 1750 310 1580 230 1485 185 2290 655 1980 425 1775 310 1605 235 1495 195 0 10 2200 655 1910 440 1705 315 1535 240 1385 190 2250 675 1945 445 1730 320 1555 245 1400 190 0 20 2150 675...

Page 6: ...er Box includes sensor ignitor and rollout switches Combustion Air Inducer Combustion Air Inducer Pressure Switch Heat Exchanger Upper Access Panel Blower Access Panel Primary Limit under combustion a...

Page 7: ...e hot surface ignition control system consisting of an in tegrated control figure 3 with control terminal designations in tables 1 2 and 3 sensor and ignitor figure 6 The in tegrated control and ignit...

Page 8: ...e Switch In 11 Rollout Switch In 12 Gas Valve Out TABLE 3 1 4 Quick Connect Terminals 120HUM Humidifier 120VAC LINE 120VAC XFMR Transformer 120VAC CIRC Indoor blower 120VAC EAC Indoor air quality acce...

Page 9: ...Switch failed to close or opened during heat demand 10 Watchguard Pressure Switch opened 5 times during one heat demand 11 Pressure Switch stuck closed prior to activation of combustion air inducer 12...

Page 10: ...out Switch Open 9 Pressure Switch failed to close or opened during heat demand 10 Watchguard Pressure Switch opened 5 times during one heat demand 11 Pressure Switch stuck closed prior to activation o...

Page 11: ...air temperature once the heat demand is satisfied Note the supply air temperature at the instant the blower is de energized Adjust the fan off delay to achieve a supply air tempera ture between 90 11...

Page 12: ...c er See figure 7 When excess heat is sensed in the heat exchanger the limit will open If the limit is open the in tegrated control energizes the supply air blower and clos es the gas valve The limit...

Page 13: ...ire 5 Connect lead to Terminal FS on integrated control 6 Turn supply voltage on and close thermostat contacts to cycle system 7 When main burners are in operation for two minutes take reading TABLE 6...

Page 14: ...s after the gas valve closes post purge A pressure switch mounted on the combustion air inducer orifice plate is used to prove inducer operation The com bustion air inducer orifice will be different f...

Page 15: ...diameter probes in order not to damage plug Check voltage during 20 second ignitor warm up period Voltage should read 120 volts 10 If voltage reads below these values check for correct supply voltage...

Page 16: ...ive to atmospheric pressure If the flue becomes obstructed during operation the switch senses a loss of negative pressure pressure becomes more equal with atmospheric pressure and opens the cir cuit t...

Page 17: ...then reinstall the mounting screws See unit Installation Instructions for more detail IMPORTANT The combustion air pressure switch must be moved for horizontal discharge air left position vent pipe v...

Page 18: ...roubleshooting Troubleshooting the motor is an easy process Follow steps below 1 Shut off power to unit 2 Remove input plugs P48 and P49 from motor See figure 14 for troubleshooting procedure If corre...

Page 19: ...peed tap used for continuous fan 1 2 3 4 or 5 on input plug P49 If 24 volts is not present problem may be up stream of plug P49 Proceed to test 4 Multi Meter set to VAC 12 0 12 0 24 Multi Meter set to...

Page 20: ...ximately the same resistance within an ohm 3 Check to see if the blower wheel spins freely Motor Test FIGURE 17 TABLE 9 Scale Measurement range in words ohms 2 M two megohm two million ohms 0 2 000 00...

Page 21: ...ervice is to be performed 3 Remove the upper access panel 4 Move gas valve switch to OFF position Do not force See figure 19 5 Replace the upper access panel B Safety or Emergency Shutdown Disconnect...

Page 22: ...fitting Connect to a test gauge to measure supply pressure 2 Start unit and allow 5 minutes for unit to reach steady state 3 After allowing unit to stabilize for 5 minutes record supply pressure and...

Page 23: ...0 135 Nat 3 5 3 5 2 9 3 5 4 5 13 0 LP Propane 10 0 10 0 9 6 10 0 11 0 13 0 TABLE 13 Pressure Switch and Gas Conversion Kits at all Altitudes Model Input Size High Altitude Pressure Switch Kit High Al...

Page 24: ...es a poor or partial ground Compare the readings to the table below If the readings exceed the maximum shown in table 14 make repairs before operating the furnace 2 In addition measure the AC voltage...

Page 25: ...ate TEMPERATURE RISE Supply Duct Temperature ________ Return Duct Temperature _ _____ Temperature Rise ________ SUPPLY AIR Temperatures RETURN AIR FIGURE 23 C External Static Pressure 1 Tap locations...

Page 26: ...t exchanger and clean if necessary 6 Check the cleanliness of blower assembly and clean the housing blower wheel and blower motor if necessary The blower motors are prelubricated for extended bearing...

Page 27: ...alve rollout switches primary limit switch and make up box then disconnect them 4 Remove the screws that secure the combustion air inducer pressure switch assembly to the collector box Carefully remov...

Page 28: ...NOx units only Replace NOx inserts 15 Reinstall collector box and combustion air assembly Reinstall all screws to the collector box and combustion air inducer Failure to replace all screws may cause l...

Page 29: ...rol energizes B6 combustion air inducer S18 combustion air pressure switch closes Once S18 closes a 15 second pre purge follows 6 A92 integrated control energizes R33 ignitor A 20 second warm up perio...

Page 30: ...OFF COMBUSTION AIR INDUCER ON INDOOR BLOWER ON HEATING SPEED LED FLASHES CODE 11 PRESSURE SWITCH CLOSED GAS VALVE OFF COMBUSTION AIR INDUCER OFF INDOOR BLOWER OFF WITH DELAY Sequence holds until press...

Page 31: ...NCE FOUR TIMES FLAME SIGNAL 1 5 MICROAMPS OR GREATER YES YES YES ROLLOUT SWITCH CLOSED LED FLASHES CODE 8 ROLLOT SWITCH OPEN GAS VALVE POWER OFF COMBUSTION AIR INDUCER POWER ON INDOOR BLOWER ON SEQUEN...

Page 32: ...SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT COOLING CYCLE THERMOSTAT CALLS FOR COOLING COMPRESSOR CONTACTOR AND SYSTEM FAN ENERGIZED WITH 2 SECOND DELAY COOLING SPEED EAC TERM ENERGIZED COMPRESSOR O...

Page 33: ...D EAC TERM REMAINS ON THERMOSTAT OPENS MANUAL FAN SELECTION MADE AT THERMOSTAT CONTROL G ENERGIZES SYSTEM FAN AT FAN SPEED EAC TERM ENERGIZED NO YES YES NO SYSTEM FAN SWITCHES TO HEAT SPEAD AFTER 30 S...

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