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Page 3

SPECIFICATIONS

Gas
H

ti

ModelNo.

G50UHi−60C−110

G50UHi−60D−135

Heating
Performance

Input− Btuh (kW)

110,000 (32.2)

132,000 (38.7)

Performance

Output− Btuh (kW)

89,400 (26.2)

106,900 (31.3)

AFUE

80.0%

80.0%

California Seasonal Efficiency

73.9%

75.0%

Highstatic (CSA) − in.w.g. (Pa)

.50 (124)

.50 (124)

Temperature rise range − 

_

F (

_

C)

30 − 60 (18 − 36)

45 − 75 (25 − 42)

Connections

Flue − in. (mm) round

4 (102)

4 (102)

GaspipesizeIPS− in. (mm)

1/2 (12.7)

1/2 (12.7)

Indoor
Blower

Wheelnominaldiameter xwidth −in. (mm)

11−1/2 x 10 (292 x 254)

11−1/2 x 10 (292 x 254)

Blower

Motoroutput − hp (W)

1 (746)

1 (746)

Tons(kW) ofadd-oncooling

5 (17.6)

5 (17.6)

Shippingweight − 1 package

175 lbs. (79 kg)

195 lbs. (88 kg)

Electricalcharacteristics

120 volts − 60 hertz − 1 phase (less than 12 amps)

OPTIONAL ACCESSORIES − MUST BE ORDERED EXTRA

Filters and
Filter Bases

2

 Air Filter and Rack Kit

Number & size of filters

Horizontal (end) − in. (mm)

87L97 

(1) 20 x 25 x 1 (508 x 635 x 25)

87L98 

(1) 25 x 25 x 1 (635 x 635 x 25)

Filter Bases

Number & size of filters

Side Return − in. (mm)

Single 

44J22

 or Ten Pack

 66K63

(1) 16 x 25 x 1 (406 x 635 x 25)

Single 

44J22

 or Ten Pack

 66K63

(1) 16 x 25 x 1 (406 x 635 x 25)

EZ Filter
Base

Catalog Number − Shipping Weight

73P57

 − 8 lbs. (4 kg)

73P58

 − 10 lbs. (5 kg)

Dimensions − H x W x D − in. (mm)

4 x 21−5/8 x 28−5/8 (102 x 549 x 727)

4 x 24−5/8 x 28−5/8 (102 x 625 x 727)

Number and size of filter (field provided)

20 x 25 x 1 in. (508 x 635 x25 mm)

24 x 24 x 1 in. (610 x 610 x 25 mm)

Gas
Accessories

High Altitude Orifice Kit − Nat. Gas Only

47M82

47M82

Accessories

High Altitude

Pressure Switch Kit

4501−7500 ft. (1372−2286 m)

49L90

49L90

Pressure Switch Kit

7501−10,000 ft. (2286−3048 m)

15M22

15M22

LPG/Propane Kit

0−7500 ft. (0−2286 m)

45L60

45L60

p

7501−10,000 ft. (2286−3048 m)

47M81

47M81

Horizontal Support Frame Kit 

− Shipping Weight

56J18 

− 18 lbs. (8 kg)

56J18 

− 18 lbs. (8 kg)

Relay Kit

56L68

56L68

SignatureStat

t

 − Home Comfort Controller

51M26

51M26

Vent Adaptor

 − 6 in. 152 (mm) connection size

18M79 −

 2 lbs. (1 kg)

18M79 −

 2 lbs. (1 kg)

NOTE − Filters and provisions for mounting are not furnished and must be field provided.

1

Annual Fuel Utilization Efficiency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized furnaces.

2

Cleanable polyurethane frame type filter.

3

Required for proper operation at altitudes from 7501 to 10,000 ft. (2286 to 3048 m).

4

Required for proper operation at altitudes over 4500 ft. (1370 m).

5

Flue connection on the unit is 4 in. (102 mm) diameter. Most applications will require 5 in. (127 mm) venting and field supplied 4 x 5 in. (102 x 127 mm) adaptor. See
Venting Tables in the Installation Instructions for detailed information.

HIGH ALTITUDE INFORMATION

All models − Pressure regulator adjustment may be required de-
pending on altitude. See below for proper pressure regulator
setting.

Manifold Pressure (Outlet) in. w.g. (kPa)

ALTITUDE ft. (m)

FUEL

0−4500

(0−1372)

4501−5500

(1373−1676

)

5501−6500

(1677−1981

)

6501−7500

(1982−2286

)

Natural Gas

3.5 (.87)

3.3 (.82)

3.2 (.80)

3.1 (.77)

LPG/Propane

10.0 (2.49)

10.0 (2.49)

10.0 (2.49)

10.0 (2.49)

Pressure switch is factory set. No adjustment is necessary.
All models use the factory installed pressure switch from 0−4500 feet
(0−1370 m).
All models require a High Altitude Pressure Switch Kit if installed at altitudes
above 4500 feet (1372 m).
All natural gas models require a High Altitude Orifice Kit at altitudes of
7500−10,000 feet (2286−3048 m).
See Specifications table for ordering information.

Summary of Contents for G50UHi Series

Page 1: ...ned 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 ma...

Page 2: ...gle 44J22 Ten Pack 66K63 1 16 x 25 x 1 406 x 635 x 25 EZ Filter Base Catalog Number Ship Wt 73P55 6 lbs 3 kg 73P56 7 lbs 3 kg 73P56 7 lbs 3 kg Base Dimensions H x W x D 4 x 14 1 4 x 28 5 8 in 102 x 36...

Page 3: ...8 m 15M22 15M22 LPG Propane Kit 0 7500 ft 0 2286 m 45L60 45L60 p 7501 10 000 ft 2286 3048 m 47M81 47M81 Horizontal Support Frame Kit Shipping Weight 56J18 18 lbs 8 kg 56J18 18 lbs 8 kg Relay Kit 56L68...

Page 4: ...060 500 475 985 465 445 875 415 390 790 375 330 690 325 290 525 250 225 0 9 225 935 440 435 930 440 435 885 420 410 825 390 390 740 350 350 675 320 295 510 240 235 NOTES All air data is measured exter...

Page 5: ...375 650 420 1075 505 290 0 4 100 2055 970 1015 1945 920 890 1825 860 775 1680 790 645 1525 720 545 1375 650 455 1075 505 310 0 5 125 2010 950 1025 1895 895 890 1810 855 810 1680 795 690 1515 715 580 1...

Page 6: ...Page 6 FIGURE 1...

Page 7: ...HORIZONTAL POSITION BLOWER ACCESS PANEL HEAT EXCHANGER ASSEMBLY BURNER ASSEMBLY COMBUSTION AIR INDUCER SURELIGHT CONTROL BOARD GAS VALVE BURNER ACCESS PANEL BLOWER ASSEMBLY PRIMARY LIMIT BLOWER CONTRO...

Page 8: ...utions will help to avoid control exposure to electrostatic dis charge by putting the furnace the control and the technician at the same electrostatic poten tial Neutralize electrostatic charge by tou...

Page 9: ...tion air inducer is energized When the differential in the prove switch is great enough the prove switch closes and a 15 second pre purge begins If the prove switch is not proven within 2 1 2 minutes...

Page 10: ...NEOUS FAST FLASH SIMULTANEOUS FAST FLASH Normal operation signaled when heating demand initiated at thermostat SLOW FLASH ON Primary or secondary limit switch open Limit must close within 3 minutes or...

Page 11: ...ic or electro mechanical thermostats without modification Each time power is applied to the furnace the ignition con trol performs a selfcheck The SureLight ignitor is made of durable silicon nitride...

Page 12: ...ge to the ignitor until it finds the lowest amount of power that will provide a successful ignition This amount of power is used for 255 cycles On the 256th call for heat the control will again ramp d...

Page 13: ...ge before re moving blower control module cover Failure to wait may cause personal injury or death Remove the cover panel from the module to access the se lector jumpers There are five selector pins i...

Page 14: ...C Ramp A 6 Ignitor The SureLight ignitor is made of durable silicon nitride Ig nitor longevity is enhanced by controlling voltage to the ig nitor The board finds the lowest ignitor temperature which...

Page 15: ...cut out from the side of the cabinet See figure 15 Use the two provided sheet metal screws to install the cut out on the top cap to cover the original flue outlet open ing Combustion Air Inducer Upfl...

Page 16: ...ir blower and closes the gas valve The limit automatically resets when unit temperature returns to normal G50UHi 1 through 6 units use a surface type limit factory set to open at 125 F G50UHi 7 and la...

Page 17: ...eywell Gas Valve Turn knob on gas valve clockwise to OFF Do not force See figure 18 7 Wait five 5 minutes to clear out any gas If you then smell gas STOP Immediately call your gas supplier from a neig...

Page 18: ...n checked and adjusted check manifold pressure Move pressure gauge to outlet pres sure tap located on unit gas valve GV1 Checks of man ifold pressure are made as verification of proper regulator ad ju...

Page 19: ...a tion Current passes from the sensor through the flame to ground to complete a safety circuit TABLE 17 Flame Signal in Microamps Ignition Control Normal Low Drop Out 97L48 0 61 0 21 0 60 0 20 69M15 0...

Page 20: ...onnect the other end of manometer to the return duct as above For systems with non ducted returns leave the other end of the manometer open to the at mosphere 3 With only the blower motor running and...

Page 21: ...aning is accomplished Reverse drill and slowly work the cable out of opening 8 Repeat procedure for each heat exchanger section 9 After each of the top heat exchanger sections has been cleaned insert...

Page 22: ...Page 22 VII WIRING AND SEQUENCE OF OPERATION...

Page 23: ...s into 5 minute Watchguard Pressure Switch delay Once S18 closes a 15 second pre purge follows 4 SureLight control A92 energizes ignitor A 20 second warm up period begins 5 Gas valve opens for a 4 sec...

Page 24: ...WITH DELAY LED 1 OFF LED 2 SLOW FLASH Sequence holds until PROVE switch closes or thermostat resets control NO NO YES NO IS THERE PROPER GROUND IS VOLTAGE ABOVE 75 VOLTS LED 1 AND LED 2 ALTERNATING FA...

Page 25: ...CER OFF INDOOR BLOWER OFF WITH DELAY LED 1 ALT SLOW FLASH LED 2 ALT SLOW FLASH IS 60 MINUTE RESET PERIOD COMPLETE YES 4 SECONDS YES HAS CONTROL RESET IGNITION SEQUENCE FOUR TIMES FLAME SIGNAL NORMAL S...

Page 26: ...TOR AND SYSTEM FAN ENERGIZED AFTER DELAY COOL SPEED AND ELECTRONIC AIR CLEANER TERMINAL IS ENERGIZED Control board 69M15 2 second delay Control board 97L48 no delay COMPRESSOR OFF THERMOSTAT OPENS COO...

Page 27: ...OPENS COMBUSTION AIR INDUCER AND HEATING ACCESSORY TERMINAL ARE DE ENERGIZED INDOOR BLOWER SWITCHES TO COOL SPEED THERMOSTAT OPENS INDOOR BLOWER SWITCHES TO CONTINUOUS BLOWER ELECTRONIC AIR CLEANER T...

Page 28: ...pen ACTION 1 Manually reset the roll out switch by pushing the top button ACTION 2 Determine the cause of the roll out switch activation before leaving furnace code LED 1 O 1 2 2 Roll out switch failu...

Page 29: ...1 Alternating Fast Flash LED 2 Alternating Fast Flash 2 1 2 Broken or failed ignitor ACTION 1 Unplug ignitor and read resistance across ignitor If resistance does not read be tween 10 9 and 19 7 ohms...

Page 30: ...with a heating demand Diagnostic lights flash the pressure switch failure code 2 5 minutes after heating demand 4 1 2 Prove switch does not close due to obstructions in the pressure lines ACTION 1 Re...

Page 31: ...ure switch code LED 1 Off LED 2 Slow Flash 6 1 1 Low pressure differential at the prove switch ACTION 1 Check for restricted exhaust vent Remove all blockage ACTION 2 Check for proper vent sizing See...

Page 32: ...ash 6 3 3 Insufficient flow through the heat exchanger caused by a sooted or restricted heat exchanger ACTION 1 Check for sooting deposits or other restrictions in the heat exchanger assembly Clean as...

Page 33: ...lash 7 1 2 Sense rod is contaminated ACTION 1 Check sense rod for contamination or coated surface Clean the sense rod with steel wool or replace sensor DO NOT USE SAND PA PER TO CLEAN ROD SAND PAPER W...

Page 34: ...t lead from ACB Cool to 120HOT terminal D Make sure blower access panel is replaced properly to close door interlock switch and energize SureLight control board D Repeat with ACB Heat and ACB Low lead...

Page 35: ...ize SureLight control board D Check for proper demand from thermostat Is motor operating properly Recheck all wiring connections CHECK BLOWER CONTROL MODULE Proper blower control module must be instal...

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