Advertisement
Service Literature
ML180UHA series units are mid-efficiency gas furnaces
used for upflow or horizontal applications only, manufac
tured with Lennox Duralok Plust heat exchangers formed
of aluminized steel. ML180UHA units are available in heat
ing capacities of 69.6 to 139.3 MJ/h and cooling applica
tions 10 to 17 kW. Refer to Engineering Handbook for prop
er sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LP/Propane operation.
ML180UHA model units are equipped with a hot surface
ignition system. All units use a redundant gas valve to as
sure safety shut-off as required.
All specifications in this manual are subject to change. Pro
cedures outlined in this manual are presented as a recom
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommended only and do not constitute
code.
WARNING
This product contains a chemical known to the State
of California to cause cancer, birth defects, or other
reproductive harm.
TABLE OF CONTENTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
II Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
Corp. 1218-L4
Revised 05 /2017
Page 2
Page 3
Page 5
Page 6
Page 14
Page 14
. . . . . . . . .
Page 15
. . . . . . . . .
Page 19
Page 20
. . . . . .
Page 22
Page 1
ML180UHA
IMPORTANT
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a qualified installer, service agency
or the gas supplier.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon
nect switch(es). Unit may have multiple
power supplies.
WARNING
Sharp edges.
Be careful when servicing unit to avoid sharp edges
which may result in personal injury.
WARNING
Do not modify this appliance.
© 2017 Lennox Industries Inc.
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Lenox ML180UH110AP36C
Summary of Contents for Lenox ML180UH110AP36C
-
Page 1: Table Of Contents
ML180UHA Corp. 1218-L4 Service Literature Revised 05 /2017 ML180UHA series units are mid-efficiency gas furnaces used for upflow or horizontal applications only, manufac tured with Lennox Duralok Plust heat exchangers formed of aluminized steel. ML180UHA units are available in heat ing capacities of 69.6 to 139.3 MJ/h and cooling applica... -
Page 2: Specifications
SPECIFICATIONS Model Number ML180UH070AP36A ML180UH090AP48B ML180UH110AP36C Heating Australian Gas Association Performance Energy Rating - Stars Input - Mj/h 69.6 92.8 116.1 Output - kW 15.5 20.6 25.8 Temperature rise range - °C 14 - 31 14 - 31 19 - 36 Gas Manifold Pressure (kPa) 0.87 / 2.30... -
Page 3: Blower Data
Pressure High Watts Watts Watts L/s Watts L/s Watts L/s Watts L/s Watts 890 1085 715 849 1050 679 849 1016 679 ML180UH110AP36C PERFORMANCE (Less Filter) Air Volume at Various Blower Speeds External Static Medium- Medium- High Pressure High L/s Watts L/s Watts L/s Watts L/s Watts... - Page 4 BLOWER DATA ML180UH110AP60C PERFORMANCE (Less Filter) Air Volume at Different Blower Speeds Bottom Return Air, Side Return Air with Optional Single Side Return Air − Air volumes in bold require field External Return Air Base, Return Air from Both Sides or Return fabricated transition to accommodate 508 x 635 x 25 mm Static Air from Bottom and One Side.
-
Page 5: Parts Identification
Combustion Air Inducer Gas Valve Burner/Manifold Assembly IEC Receptacle Limit Switch (under combustion air inducer) Upper Access Panel Control Box Capacitor Transformer Blower Access Panel Blower Assembly Shipping Pad ML180UH090AP48B, & ML180UH110AP36C only. Remove prior to operation FIGURE 1 Page 5... -
Page 6: I Unit Components
I-UNIT COMPONENTS 3. Circuit Breaker (CB8) A 24V circuit breaker is also located in the control box. ML180UHA unit components are shown in figure 1.The The switch provides overcurrent protection to the trans gas valve, combustion air inducer and burners can be ac former (T1). - Page 7 INTEGRATED CONTROL TERMINAL DESIGNATIONS HUM - Humidifier 230VAC LINE - Input 230VAC XFMR - Transformer 230VAC EAC - Electronic Air Cleaner 230VAC COOL - Cool Speed 230VAC PARK1, PARK2 - Dead terminals for alternate speed taps NEUTRALS - Neutral terminals 230VAC HEAT - Heating Speed 230VAC FS - Flame Sense (red)
- Page 8 TABLE 3 FLASH CODE STATUS / ERROR DESCRIPTION (X + Y) FLASH CODE DESCRIPTIONS Pulse A 1/4 second flash followed by four seconds of off time. Heartbeat Constant 1/2 second bright and 1/2 second dim cycles. LED flashes X times at 2Hz, remains off for two seconds, flashes Y times at 2Hz, remains off for four X + Y seconds, then repeats.
- Page 9 Electronic Ignition tory fan off setting of 60 seconds. For customized comfort, On a call for heat the integrated control monitors the com monitor the supply air temperature once the heat demand bustion air inducer pressure switch. The control board will is satisfied.
- Page 10 ML180UHA HEATING COMPONENTS Gasket Flue Transition Pressure Switch Ignitor Rollout Switches Orifice Plate Collector Box Combustion Air Inducer Sensor Manifold And Gas Valve FIGURE 6 5. Flame Sensor (Figure 6) 7. Primary Limit Control (S10) A flame sensor is located on the left side of the burner sup The primary limit on ML180UHA units is located in the heating port.
- Page 11 8. Ignitor (Figure 6) NOTE - The ML180UHA furnace contains electronic components that are polarity sensitive. Make sure that The nitride ignitor used on ML180UHA units is made from a the furnace is wired correctly and is properly grounded. proprietary ceramic material. Ignitor longevity is enhanced by controlling the voltage to the ignitor.
- Page 12 9. Gas Valve (Figure 6) 11. Combustion Air Inducer Pressure Switch (S18) The ML180UHA uses internally redundant gas valve to as sure safety shut-off. If the gas valve must be replaced, the ML180UHA series units are equipped with a combustion air same type valve must be used.
- Page 13 Multiple Venting screws, rotate the assembly (assembly consists of orifice plate, proving switch, gasket and combustion air inducer), The ML180UHA furnace can vent in multiple positions. See then reinstall the mounting screws. See unit Installation In figure 8. structions for more detail. The make up box may be removed and the combustion air IMPORTANT inducer may be rotated clockwise or counterclockwise 90°...
-
Page 14: Iii- Start-Up
SUPPLY AIR BLOWER ALIGN AND TIGHTEN SET SCREW WITH AND SECONDARY LIMIT(S) FLAT SIDE OF MOTOR SHAFT Left Side Right Side Set Screw Housing Hub SECONDARY Motor LIMIT (S) Shaft MOTOR/BLOWER ASSEMBLY CAPACITOR To Remove Blower From Unit: Disconnect Power, Remove Control Box, Remove Bolts and Unplug Motor Wires From Integrated Control. -
Page 15: Iv-Heating System Service Checks
1 - STOP! Read the safety information at the beginning of B- Gas Piping this section. Gas supply piping should not allow more than 125Pa (13 mm W.C.)drop in pressure between gas meter and unit. 2 - Set the thermostat to the lowest setting. Supply gas pipe must not be smaller than unit gas connec... - Page 16 D- Gas Pressure Adjustment 4 - After allowing unit to stabilize for 5 minutes, record manifold pressure and compare to value given in table Gas Flow (Approximate) TABLE 6 NOTE - Shut unit off and remove manometer as soon as an GAS METER CLOCKING CHART accurate reading has been obtained.
- Page 17 G- Flame Signal 3 - Disconnect integrated control flame sensor wire from the flame sensor. A microamp DC meter is needed to check the flame signal 4 - Connect (-) lead to flame sensor. on the integrated control. 5 - Connect (+) lead to the ignition control sensor wire. Flame (microamp) signal is an electrical current which passes 6 - Turn supply voltage on and close thermostat contacts to from the integrated control to the sensor during unit operation.
- Page 18 H- Proper Ground and Voltage CHECK VOLTAGE BETWEEN LINE HOT AND LINE NEUTRAL A poorly grounded furnace can contribute to premature ig nitor failure. Use the following procedure to check for ground and voltage to the integrated control. 1 - Measure the AC voltage between Line Neutral (spade terminals) and “C”...
-
Page 19: Typical Operating Characteristics
V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure 1 - Tap locations shown in figure 18 . A-Blower Operation and Adjustment 2 - Punch a 6.3 mm (1/4”) diameter hole in supply and re NOTE- The following is a generalized procedure and turn air plenums. -
Page 20: Vi-Maintenance
VI-MAINTENANCE 6 - Disconnect gas supply piping. Remove the screw se curing the burner box cover and remove cover. Re A-Preliminary and Seasonal Checks move the four screws securing the burner manifold as 1 - Inspect electrical wiring, both field and factory installed sembly to the vestibule panel and remove the assem... - Page 21 C-Supply Air Blower CAUTION 1 - Check and clean blower wheel. 2 - Motors used on the Lennox ML180UHA series units Some soaps used for leak detection are corrosive to are permanently lubricated and need no further lu certain metals. Carefully rinse piping thoroughly af brication.
-
Page 22: Vii- Wiring And Sequence Of Operation
VII- Wiring and Sequence of Operation When there is a call for heat, W1 of the thermostat energizes W of the furnace control with 24VAC. Integrated control runs a self-check. S10 primary limit, S47 rollout switch and S21 secondary limit contacts are found to be closed. Call for heat can continue. - Page 23 Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION NORMAL AND ABNORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. (RESET CONTROL BY CONTROL SELF-CHECK OKAY? TURNING MAIN POWER OFF.) POLARITY REVERSED. STATUS ERROR CODE 5 + 4. POLARITY OKAY? IS THERE A SIGNAL HOLDS UNTIL UNIT IS PROPERLY GROUNDED.
- Page 24 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT STATUS LED - HEARTBEAT (Refer to box A on previous page) PRESSURE SWITCH CLOSED WITHIN GAS VALVE OFF. COMBUSTION AIR INDUCER 2.5 MINUTES? OFF. INDOOR BLOWER OFF. UNIT WILL RETRY AFTER 5-MINUTE WAIT PERIOD.
- Page 25 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT. STATUS LED -- HEARTBEAT. SEE BOX A. FLAME SIGNAL ABOVE (u1.40 microamps) LOW FLAME SIGNAL (Does not affect control operation) STATUS ERROR CODE 1 + 2. 30-SECOND INDOOR BLOWER ON DELAY BEGINS.
- Page 26 Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION POWER ON SIGNAL POLARITY REVERSED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS POLARITY REVERSED? IN THIS CONDITION. STATUS ERROR CODE 5 + 4. SIGNAL IMPROPER GROUND AT LED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS THERE IN THIS CONDITION.
- Page 27 Troubleshooting: Continuous Fan Sequence of Operation CONTINUOUS FAN SEQUENCE OF OPERATION MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT SPEED HUM TERM. ENERGIZES THERMOSTAT CALLS FOR HEAT (W). WITH COMB. AIR INDUCER. SYSTEM FAN REMAINS ON THERMOSTAT CALLS FOR COOLING.
Need help?
Do you have a question about the ML180UH110AP36C and is the answer not in the manual?
Questions and answers