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G61MP
Corp. 0308−L6
Revised 10−2004
Service Literature
G61MP SERIES UNITS
G61MP series units are high−efficiency multi−position (up-
flow, downflow, horizontal right and left) gas furnaces
manufactured with Lennox Duralok Plus heat exchang-
ers formed of aluminized steel. G61MP units are available
in heating capacities of 44,000 to 132,000 Btuh (13.0.0 to
38.6 kW) and cooling applications from 2 to 5 tons (7.0 kW
to 17.5 kW)) up to 5 tons. Refer to Engineering Handbook
for proper sizing.
Units
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SPECIFICATIONS Gas ModelNo. G61MP−36B−045 G61MP−36B−070 G61MP−48C−090 G61MP−60C−090 Ht Heating i Input− Btuh (kW) 44,000 (12.9) 66,000 (19.3) 88,000 (25.8) 88,000 (25.8) Hig gh Perf Perform orma ance nce Fi Fire Output− Btuh (kW) 41,000 (12.0) 62,000 (18.2) 83,000 (24.3) 84,000 (24.6) Temperature rise range − F (C) 25 − 55 (14 − 31) 35 − 65 (21 − 39) 35 − 65 (21 − 39) 25 − 55 (14 − 31) Low Input− Btuh (kW) 30,000 (8.8) 45,000 (13.2) 60,000 (17.6) 60,000 (17.6) Fi Fire Output− Btuh (kW) 28
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SPECIFICATIONS Gas ModelNo. G61MP−48C−110 G61MP−60C−110 G61MP−60D−135 Ht Heating i Hig gh Fire Input− Btuh (kW) 110,000 (32.2) 110,000 (32.2) 132,000 (38.7) P Performance erformance Output− Btuh (kW) 104,000 (30.5) 104,000 (30.5) 124,000 (36.3) Temperature rise range − F (C) 45 − 75 (25 − 42) 35 − 65 (21 − 39) 40 − 70 (24 − 42) Low Fire Input− Btuh (kW) 75,000 (22.0) 75,000 (22.0) 90,000 (26.4) Output− Btuh (kW) 72,000 (21.1) 72,000 (21.1) 86,000 (25.2) Temperature rise range − F (C) 30
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BLOWER DATA G61MP−36B−045 PERFORMANCE (Less Filter) Air Volume / Watts at Different Blower Speeds External External S St tatic atic Pressure High Medium−High Medium−Low Low in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts 0.00 25 1555 735 630 1410 665 585 1190 560 520 1030 485 435 0.10 25 1515 715 605 1385 655 555 1190 560 485 1020 480 415 0.20 50 1470 695 580 1345 635 520 1170 550 455 1010 475 400 0.30 75 1410 665 555 1310 620 495 1155 545 440 1000 470 385 0.40 100 1350 640
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BLOWER DATA G61MP−60C−090 PERFORMANCE (Less Filter) − Single Side Return Air − Air volumes in bold require field fabricated transi- tion to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) air filter in order to maintain proper air velocity. Air Volume / Watts at Different Blower Speeds External External S St tatic atic Pressure High Medium−High Medium−Low Low in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts 0.00 0 2835 1335 1495 2340 1105 1155 1800 850 895 1440 680 695 0.10 2
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BLOWER DATA G61MP−60C−110 PERFORMANCE (Less Filter) − Bottom Return Air, Side Return Air with Optional RAB Return Air Base, Return Air from Both Sides or Return Air from Bottom and One Side. External Static Air Volume / Watts at Different Blower Speeds P Pressure High Medium−High Medium−Low Low in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts cfm L/s Watts 0.00 0 2720 1285 1385 2410 1135 1090 2055 970 935 1620 765 710 0.10 25 2665 1255 1355 2385 1125 1075 2025 955 885 1730 815 735 0.20 50 2
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G61MP PARTS ARRANGEMENT TOP CAP TM DuralokPlus HEAT EXCHANGER ASSEMBLY CABINET BURNER BOX ASSEMBLY GAS VALVE AND MANIFOLD FLUE COLLAR COMBUSTION AIR PROVE PROVE WARM HEADER SWITCHES* (COLLECTOR) BOX COMBUSTION AIR INDUCER CONDENSER COIL BURNER PRIMARY LIMIT ACCESS PANEL COLD HEADER (COLLECTOR) BOX BLOWER DOOR ACCESS INTERLOCK DOOR SWITCH SECONDARY LIMITS (2) *G61MP−090 shown. BLOWER G61MP−045 and −070 SIGHT ASSEMBLY are equipped with GLASS two switches. CONTROL BOX FIGURE 1 Page 7
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I−UNIT COMPONENTS 3. Circuit Breaker (CB8) A 24V circuit breaker is also located in the control box. G61MP unit components are shown in figure 1. The gas The switch provides overcurrent protection to the trans- valve, combustion air inducer and burners can be ac- former (T1). The breaker is rated 3A at 32V. If the current cessed by removing the burner access panel. Electrical exceeds this limit the breaker will trip and all unit opera- components are in the control box (figure 2) found in the t
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onds. After a total of five trials for ignition (including the ini- TABLE 1 tial trial), the control goes into Watchguard−Flame Failure Heating Fan Off Delay mode. After a 60−minute reset period, the control will begin the ignition sequence again. Delay (Seconds) Switch 1 Switch 2 The SureLight control board has an added feature that pro- longs the life of the ignitor. After a successful ignition, the 60 Off Off SureLight control utilizes less power to energize the ignitor 90 Off On on successiv
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TABLE 3 TWO−STAGE INTEGRATED CONTROL BOARD Integrated Control Board Terminals 120VAC Neutral LINE Line XFMR Transformer LEDs EAC Electronic Air Cleaner DIP CIRC Indoor Blower SWITCHES 1 − 4 HUM Humidifier 120VAC Line HUM Humidifier XMFR Transformer LINE Line PARK For Unused Leads COOL Cooling Speed EAC Electronic Air Cleaner HI HEAT HIigh Heat Speed W915 FACTORY INSTALLED JUMPER (MUST CLIP FOR 2 STAGE COOL) LO HEAT Low Heat, Low Cool and Continuous Fan Speed TABLE 4 Integrated Control Board 5
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TABLE 6 DIAGNOSTIC CODES Diagnostic LEDs are labeled DS1 and DS2. See figure 4 for location of diagnostic LEDs. DS1 DS2 DESCRIPTION SIMULTANEOUS SIMULTANEOUS Power on − Normal operation. SLOW FLASH SLOW FLASH Also signaled during cooling and continuous fan. SIMULTANEOUS SIMULTANEOUS Normal operation − signaled when heating demand initiated at thermostat. FAST FLASH FAST FLASH Primary, secondary, backup secondary or rollout limit switch open. Limits must SLOW FLASH ON close within 3 minutes or un
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C−Heating Components 4. Ignitor The SureLight ignitor is made of durable silicon nitride. Ig- 3. Flame Sensor nitor longevity is enhanced by controlling voltage to the ig- A flame sensor is located on the left side of the burner sup- nitor. The board finds the lowest ignitor temperature which port. See figure 6. The sensor is mounted through the bot- will successfully light the burner, thus increasing the life of tom of the burner box and the tip protrudes into the flame the ignitor. Due to this
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24VAC terminals and gas control knob or switch are located 6. Clamshell Heat Exchanger on the valve. All terminals on the gas valve are connected to G61MP units use an aluminized steel primary and stain- wires from the electronic ignition control. 24V applied to the ter- less steel secondary heat exchanger assembly. Heat is minals energizes the valve. transferred to the air stream from all surfaces of the heat Inlet and outlet pressure taps are located on the valve. A regu- exchanger. The sha
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On heat demand (first or second stage) the switch senses 1 − Remove thermostat demand and allow unit to cycle off. that the combustion air inducer is operating. It closes a cir- cuit to the furnace control when pressure inside the cold 2 − Install a tee in the negative (−) line and a tee in the positive (+) line running from one of the prove switches to the cold end header box decreases to a certain set point. end header box. Set points vary depending on unit size. See tables 8, 9 and 3 − I
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TABLE 8 12. Combustion Air Inducer (B6) 0’ to 4500’ All G61MP units use a combustion air inducer to move air Set Point Set Point through the burners and heat exchanger during heating G61MP Unit Second Stage First Stage operation. The blower uses a PSC 120VAC motor. The −045 motor operates during all heating operation and is con- 09 0.95" 5" 09 0.95" 5" trolled by the ignition control A3. Blower operates continu- −070 ously while there is a call for heat. The burner ignition con- −090 08 0.85" 5"
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II−PLACEMENT AND INSTALLATION TABLE 11 OUTDOOR TERMINATION KITS AND CORRESPONDING EQUIVALENCIES Vent Pipe Length Equivalency (feet) Outdoor Outdoor 2" Wall Exhaust Exhaust 1−1/2" 2" Con- 3" Con- VENT 2" Wall 3" Wall Kit with 2" Wall Accelerator Accelerator Concen- centric centric PIPE UNIT Plate Kit Plate Kit Vent Ex- Ring Kit DIA. (Dia. X (Dia. X tric Kit Kit Kit MODEL tension (in.) Length) Length) 44J40 1−1/2" X 12" 2" X 12" 71M80 60M29 60L46 22G44 30G28 15F74 81J20 Not Not Not 2 4 12 4 4*
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*NOTE − The exhaust pipe should be offset a minimum of A−Vent Piping Guidelines 12 inches to avoid the possibility of water droplets being re- The G61MP can be installed as either a Non−Direct Vent leased from the exhaust termination. The minimum ex- or a Direct Vent gas central furnace. haust vent length is 15 ft. Shorter exhaust vent lengths may NOTE − In Non-Direct Vent installations, combustion air is result in the discharge of water droplets from the exhaust taken from indoors and flue gase
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Use the following steps to correctly size vent pipe diameter. B−PVC Joint Cementing Procedure 1 − Determine the vent termination and its corresponding All cementing of joints should be done according to the equivalent feet value according to table 11. specifications outlined in ASTM D 2855. 2 − Determine the number of 90° elbows required for both indoor and outdoor (e.g. snow riser) use. Calculate the corresponding equivalent feet of vent pipe. 3 − Determine the number of 45° elbows required
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3. In areas where piping penetrates joists or interior C− Venting Practices walls, hole must be large enough to allow clearance on The thickness of construction through which vent pipes all sides of pipe through center of hole using a hanger. may be installed is 24" (610mm) maximum and 3" (76mm) 4. Isolate piping at the point where it exits the outside wall minimum. If a G61MP furnace replaces a furnace which or roof in order to prevent transmission of vibration to was commonly vented with ano
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TYPICAL EXHAUST PIPE CONNECTIONS CAUTION HORIZONTAL DIRECT OR NON-DIRECT VENT APPLICATIONS Do not discharge exhaust into an existing stack or (Horizontal Right-Hand Air stack that also serves another gas appliance. If verti- Discharge Application Shown) cal discharge through an existing unused stack is re- quired, insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack. *Limit pipe length to 2" in G61MPV−110 and 2−1/2", −135 applications. G61MP−36B−04
