Lennox EL180UHE Series Manual
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EL180UHE(X) series units are mid-efficiency gas furnaces
used for upflow or horizontal applications only, manufac
tured with Lennox Duralokt heat exchangers formed of
aluminized steel. EL180UHE(X) units are available in heat
ing capacities of 44,000 to 132,000 Btuh and cooling ap
plications 2 to 5 tons. Refer to Engineering Handbook for
proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LP/Propane operation.
EL180UHE(X) model units are equipped with a hot surface
ignition system. The EL180UHE(X) unit meets the Califor
nia Nitrogen Oxides (NO
) Standards and California Sea
x
sonal Efficiency requirements. All units use a redundant
gas valve to assure safety shut-off as required by C.S.A.
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.
TABLE OF CONTENTS
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II Installation
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Corp. 1302-L1
Revised 06-2013
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Page 1
EL180UHE(X)
WARNING
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 licensed professional HVAC in
staller (or equivalent), service agency or the gas sup
plier.
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.
© 2013 Lennox Industries Inc.
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Table of Contents
Related Manuals for Lennox EL180UHE Series
Summary of Contents for Lennox EL180UHE Series
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Page 1: Table Of Contents
EL180UHE(X) series units are mid-efficiency gas furnaces used for upflow or horizontal applications only, manufac tured with Lennox Duralokt heat exchangers formed of aluminized steel. EL180UHE(X) units are available in heat ing capacities of 44,000 to 132,000 Btuh and cooling ap... -
Page 2: Specifications
SPECIFICATIONS Model No. EL180UH045E36A EL180UH070E36B EL180UH090E48B Heating Model No. - Low Nox EL180UH045XE36A EL180UH070XE36B 180UH090XE48B AFUE Performance Input - Btuh 44,000 66,000 88,000 Output - Btuh 35,200 52,800 70,400 Temperature rise range - °F 15 - 45 40 - 70 35 - 65 Gas Manifold Pressure (in. - Page 3 OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA “A” Width “B” Width “C” Width “D” Width Models Models Models Models CABINET ACCESSORIES Horizontal Suspension Kit - Horizontal only 51W10 51W10 51W10 51W10 Return Air Base - Upflow only 65W75 50W98 50W99 51W00 FILTERS Air Filter and Rack Kit...
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Page 4: Blower Data
BLOWER DATA EL180UH045E36A PERFORMANCE (Less Filter) External Air Volume / Watts at Various Blower Speeds Static High Medium-High Medium Medium-Low Pressure Watts Watts Watts Watts Watts in. w.g. 0.00 1380 1155 0.10 1345 1120 0.20 1320 1080 0.30 1290 1055 0.40 1265 1010... - Page 5 BLOWER DATA EL180UH090E60C PERFORMANCE (Less Filter) Air Volume / Watts at Different Blower Speeds Bottom Return Air, Side Return Air with Optional Return Single Side Return Air − Air volumes in bold require field External Air Base, Return Air from Both Sides or Return Air from fabricated transition to accommodate 20 x 25 x 1 in.
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Page 6: Parts Identification
PARTS ARRANGEMENT Make-Up Box Heat Exchanger Combustion Air Inducer Combustion Air Inducer Pressure Switch Burner Box (includes sensor, ignitor and rollout switches) Gas Valve Primary Limit Control Box (under (includes integrated control, combustion interlock switch and transformer) air inducer) Blower Assembly Access Panel Power Choke (4 and 5 Ton Only) -
Page 7: I Unit Components
I-UNIT COMPONENTS 4. Integrated Control (A92) EL180UHE(X) unit components are shown in figure 1.The gas valve, combustion air inducer and burners can be ac cessed by removing the upper access panel. Electrical WARNING components are in the control box (figure 2) found in the blower section. - Page 8 TABLE 1 TABLE 3 4-Pin Terminal Designation 1/4” QUICK CONNECT TERMINALS PIN # FUNCTION 120HUM Humidifier 120VAC Combustion Air Inducer Line LINE 120VAC Ignitor Line XFMR Transformer 120VAC Combustion Air Inducer Neutral CIRC Indoor blower 120VAC Ignitor Neutral Indoor air quality accessory 120VAC TABLE 2 NEUTRALS Common 120VAC...
- Page 9 TABLE 4 The integrated control is equipped with an LED light for troubleshooting. The diagnostic codes are listed below in table 4. RED LED Diagnostic Codes / Status of Furnace Flash Code No power to control or board fault detected Board fault detected, Heartbeat Control powered - displayed during all modes of operation if no errors are detected...
- Page 10 Cooling Fan Off Time Fan Time Control Heating Fan On Time The control has a 45 second fan off delay after cooling de mand has been met. This delay is factory set and not ad The fan on time of 30 seconds is not adjustable. justable.
- Page 11 The integrated control al unit model number. If limit switch must be replaced, refer to lows the gas valve to remain open as long as flame signal is Lennox ProductZone repair parts list on Lennox Dave Net®. sensed.
- Page 12 A microamp DC meter is needed to check the flame signal 3 - Remove sensor wire from integrated control. on the integrated control. 4 - Connect (-) lead to flame sensor wire. Flame (microamp) signal is an electrical current which 5 - Connect (+) lead to Terminal FS on integrated control.
- Page 13 Inlet and outlet pressure taps are located on the valve. A 045E36A 1.063” regulator adjustment screw is located on the valve. 070E36B 1.316” LPG changeover kits are available from Lennox. Kits in clude burner orifices and a gas valve regulator spring. 090E48B, 090E60C 1.531” 9. Combustion Air Inducer (B6) 110E60C 1.690”...
- Page 14 IGNITOR CHECKS Test 1 Check ignitor circuit for correct resistance. Remove 4-pin plug from control. Check ohms reading across terminals 2 and 4. The reading should be between 39 and 70 ohms. If value is correct, this is the only test needed. If the reading on the meter is not correct, (0 or infinity) then a second test is needed.
- Page 15 11. Combustion Air Inducer loss of negative pressure (pressure becomes more equal Pressure Switch (S18) with atmospheric pressure) and opens the circuit to the in tegrated control and gas valve. A bleed port on the switch EL180UHE(X) series units are equipped with a combustion allows relatively dry air in the vestibule to purge switch tub...
- Page 16 Multiple Venting screws, rotate the assembly (assembly consists of orifice plate, proving switch, gasket and combustion air inducer), The EL180UHE(X) furnace can vent in multiple positions. then reinstall the mounting screws. See unit Installation In See figure 11. 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 17 12. Blower Motor BLOWER WHEEL REPLACEMENT IMPORTANT Center Blower Wheel in Blower Housing Each blower is statically and dynamically bal anced as an assembly before installation in the unit. EL180UHE units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic control module both contained in the same motor housing.
- Page 18 Multi−Meter (set to VAC) Multi−Meter (set to VAC) Test 1 Test 3 (if necesssary) Turn on power to unit. Check for 120 volts across terminals “L” Check for 120 volts across terminals “CIRC” and “Neutrals” on and “N” on input plug P48. If voltage is present continue to test the integrated control.
- Page 19 Replacing the Motor Module Motor Test 1. Disconnect electrical power to unit. 2. Remove unit access panel. 3. Unplug the two harnesses from the motor control mod ule. See figure 15. Unplug the Two Harness Connection TWO HARNESS FIGURE 17 CONNECTIONS TABLE 8 MOTOR...
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Page 20: Start Up
II- PLACEMENT AND INSTALLATION 2 - Turn off all electrical power to the unit if service is to be performed. Make sure unit is installed in accordance with installation 3 - Remove the upper access panel. instructions and applicable codes. 4 - Move gas valve switch to OFF position. - Page 21 Gas Leak Detector is strongly recommended. It is 4 - After allowing unit to stabilize for 5 minutes, record available through Lennox under part number 31B2001. manifold pressure and compare to value given in table See Corp. 8411-L10, for further details.
- Page 22 TABLE 11 Supply and Manifold Pressure Settings at all Altitudes Manifold Pressure in. wg. Supply Pressure in.wg. Model Input Size 0-2000 ft 2001-4500 ft. 4501-7500 ft 7501 - 10,000 ft 13.0 LP/propane 10.5 10.0 10.0 10.0 11.0 13.0 13.0 LP/propane 10.0 10.0 10.0...
- Page 23 H- Proper Ground and Voltage CHECK VOLTAGE BETWEEN LINE HOT A poorly grounded furnace can contribute to poor flame AND LINE NEUTRAL sense signal. 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”...
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Page 24: Typical Operating Characteristics
V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure 1 - Tap locations shown in figure 24 . A-Blower Operation and Adjustment 2 - Punch a 1/4” diameter hole in supply and return air ple NOTE- The following is a generalized procedure and nums. -
Page 25: Maintenance
Before using any filter with this system, check the spect inside the burners and crossovers for any block specifications provided by the filter manufacturer against the data given in the appropriate Lennox age caused by foreign matter. Remove any blockage. Product Specifications bulletin. Additional informa... - Page 26 EL180UHE BURNER, COMBUSTION AIR INDUCER ASSEMBLY & HEAT EXCHANGER REMOVAL Gasket Flue Transition Pressure Switch Rollout Switches (-090, -110 -135 units) Heat Exchanger Rollout Switches Ignitor (-045 and -070 units) Orifice Plate Collector Box Combustion Air Inducer Flame Sensor Retention Rings Cross Over Manifold And Gas Valve FIGURE 25...
- Page 27 EX − kVAr V1 V2 C-Supply Air Blower True RMS Meter 1 - Check and clean blower wheel. 2 - Motors used on the Lennox EL180UHE(X) series units are permanently lubricated and need no further lu FIGURE 28 brication. Page 27...
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Page 28: Wiring And Sequence Of Operation
VII- Wiring and Sequence of Operation EL180UHE Schematic Wiring Diagram and Sequence of Operation Line voltage is applied to L1 and N. the T1 low voltage transformer is energized, and line voltage is applied to B3 indoor blower. S47 rollout switch(es) must be closed in order for 24V from transformer to be output on integrated control ”R” to power thermostat. When there is a call for heat, W1 of the thermostat energizes W of the furnace control with 24VAC. - Page 29 Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION ABNORMAL HEATING MODE NORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER DELAY OFF. CONTROL SELF-CHECK OKAY? LED SLOW FLASH (RESET CONTROL BY TURNING MAIN POWER OFF.) LED FLASHES CODE 1 - POLARITY REVERSED.
- Page 30 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE CONTINUED NORMAL HEATING MODE ABNORMAL HEATING MODE 15‐SECOND COMBUSTION AIR INDUCER PREPURGE INITIATED BY CLOSED PRESSURE SWITCH. LED FLASHES CODE 13 - LOW LINE VOLTAGE. ONCE VOLTAGE IS IGNITOR WARM‐UP -- 20 SECONDS. IS VOLTAGE ABOVE 70 VOLTS? ABOVE 75 VOLTS, HEATING SEQUENCE...
- Page 31 Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION NORMAL COOLING MODE ABNORMAL COOLING MODE POWER ON IGNITION CONTROL MAIN POWER ON. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF WITH NORMAL DELAY. CONTROL SELF DIAGNOSTIC CHECK. SIGNAL CIRCUIT BOARD FAILURE AT LED. IS CONTROL OPERATING NORMALLY? INTERRUPT MAIN POWER TO RESET CONTROL.
- Page 32 Troubleshooting: Continuous Fan Sequence of Operation CONTINUOUS FAN SEQUENCE OF OPERATION LED: SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT SEQUENCE. MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT FAN SPEED. EAC TERMINAL IS ENERGIZED. THERMOSTAT CALLS FOR HEAT (W). SYSTEM FAN CONTINUES FAN SPEED WITHOUT THERMOSTAT CALLS FOR COOLING.