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507961-01P

Page 54 of 58

Issue 1933

For proper furnace operation the minimum gas supply

pressure is 4.5” w.c and the maximum gas supply pressure

is 10.5” w.c for natural gas. The minimum gas supply

pressure is 10” w.c. and the maximum gas supply pressure

is 13” w.c. for LP/propane gas.

Manifold Pressure Measurement

1. A manifold pressure post located on the gas valve

provides access to the manifold pressure. See Figure

74. Back out the 3/32 Hex screw one turn, connect a

piece of 5/16” tubing and connect to a manometer to

measure supply pressure.

2. Start unit and allow 5 minutes for unit to reach steady

state.

3. While waiting for the unit to stabilize, observe the

flame. Flame should be stable and should not lift from

burner. Natural gas should burn blue.

4. After allowing unit to stabilize for 5 minutes, record

manifold pressure and compare to value given in

Table 14.

NOTE:

Shut unit off and remove manometer as soon as

an accurate reading has been obtained. Take care to re-

tighten the 3/32 Hex screw.

Proper Combustion

Furnace should operate minimum 15 minutes with correct

manifold pressure and gas flow rate before checking

combustion. Take combustion sample beyond the flue

outlet and compare to the tables below. The maximum

carbon monoxide reading should not exceed 100 ppm.

High Altitude Information

NOTE:

In Canada, certification for installations at

elevations over 4500 feet (1371 m) is the jurisdiction of

local authorities.

Units may be installed at altitudes up to 10,000 ft. above

sea level without manifold adjustment. Units installed

at altitude of 4501 - 10,000 feet (1371 to 3048 m) may

require a pressure switch change which can be ordered

separately. Table 16 lists conversion kit and pressure

switch requirements at varying altitudes.

The combustion air pressure switch is factory-set and

requires no adjustment.

Other Unit Adjustments

Primary Limit

The primary limit is located on the heating compartment

vestibule panel. This limit is factory set and requires no

adjustment.

Flame Rollout Switches (Two)

These manually reset switches are located on the front of

the burner box.

Pressure Switch

The pressure switch is located in the heating compartment

on the cold end header box. This switch checks for proper

combustion air inducer operation before allowing ignition

trial. The switch is factory set and must not be adjusted.

Temperature Rise

After the furnace has been started and supply and return

air temperatures have been allowed to stabilize, check

the temperature rise. If necessary, adjust the blower

speed to maintain the temperature rise within the range

shown on the unit nameplate. See Table 12 for allowable

heating speeds. Increase the blower speed to decrease

the temperature. Decrease the blower speed to increase

the temperature rise. Failure to adjust the temperature rise

may cause erratic limit operation.

Fan Control

The fan ON time of 30 seconds is not adjustable. The fan

OFF delay (amount of time that the blower operates after

the heat demand has been satisfied) is 120 seconds and

is not adjustable.

Thermostat Heat Anticipation

Set the heat anticipator setting (if adjustable) according to

the amp draw listed on the wiring diagram that is attached

to the unit.

Electrical

1. Check all wiring for loose connections.
2. Check for the correct voltage at the furnace (furnace

operating).

3. Check amp–draw on the blower motor.

Motor Nameplate__________Actual__________

Electronic Ignition

The integrated control has an added feature of an internal

Watchguard control. The feature serves as an automatic

reset device for integrated control lockout caused by

ignition failure. This type of lockout is usually due to low

gas line pressure. After one hour of continuous thermostat

demand for heat, the Watchguard will break and remake

thermostat demand to the furnace and automatically reset

the integrated control to begin the ignition sequence.

Exhaust and Air Intake Pipe

1. Check exhaust and air intake connections for tightness

and to make sure there is no blockage.

2. Is pressure switch closed? Obstructed exhaust pipe

will cause unit to shut off at pressure switch. Check

termination for blockages.

3. Obstructed pipe or termination may cause rollout

switches to open. Reset manual flame rollout switches

on burner box assembly if necessary.

Содержание 045-3

Страница 1: ...llation adjustment alteration service or maintenance can cause property damage personal injury or loss of life Installation and service must be performed by a licensed professional installer or equiva...

Страница 2: ...ptional RAB Return Air Base 3 Bottom return air 4 Return air from both sides 5 Bottom and one side return air 2 Optional External Side Return Air Filter kit is not for use with optional Return Air Bas...

Страница 3: ...507961 01P Page 3 of 58 Issue 1933 Figure 1 Parts Arrangement...

Страница 4: ...following 1 Snap bushing 1 Snap Plug 1 Wire tie 1 Condensate trap 1 Condensate trap cap 1 Condensate trap clamp 1 2 Diameter debris screen 1 3 4 Threaded street elbow Check equipment for shipping dama...

Страница 5: ...obtain a temperature rise within the range specified on the unit nameplate Failure to do so may cause erratic limit operation and premature heat exchanger failure This furnace must be installed so th...

Страница 6: ...TO FOLLOW THE ABOVE INSTALLATION INSTRUCTIONS FAILURE TO FOLLOW THE ABOVE INSTALLATION INSTRUCTIONS VOIDS THE MANUFACTURER S EQUIPMENT LIMITED WARRANTY COMFORT AIRE CENTURY DISCLAIMS ALL LIABILITY IN...

Страница 7: ...position of ANSI on the referenced subject which is represented only by the standard in its entirely In Canada refer to the CSA B149 Installation codes Do not install the furnace in a corrosive or con...

Страница 8: ...g shall be within 12 305 mm of the top of the enclosure and one within 12 305 mm of the bottom These openings must communicate directly or by ducts with the outdoors or spaces crawl or attic that free...

Страница 9: ...tal louvers and grilles will have 60 to 75 percent free area Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they are opened automatically during equip...

Страница 10: ...rap and drain connections and installation and service clearances 24 inches 610 mm at unit front The unit must be level from side to side Tilt the unit slightly maximum 1 2 in from level from back to...

Страница 11: ...The furnace is equipped with a removable bottom panel to facilitate installation Markings are provided on both sides of the furnace cabinet for installations that require side return air Cut the furna...

Страница 12: ...installed in horizontal applications with either right or left hand air discharge Refer to Figure 18 for clearances in horizontal applications Figure 18 Horizontal Application Installation Clearances...

Страница 13: ...f unit is installed above finished space fabricate an auxiliary drain pan to be installed under unit Set unit in drain pan as shown in Figure 20 Leave 8 inches for service clearance below unit for con...

Страница 14: ...quivalent sealing method between the plenum and the furnace cabinet to ensure a tight seal If a filter is installed size the return air duct to fit the filter frame Pipe Fittings Specifications All pi...

Страница 15: ...nutes before placing unit into operation DANGER 1 Measure and cut vent pipe to desired length 2 Debur and chamfer end of pipe removing any ridges or rough edges If end is not chamfered edge of pipe ma...

Страница 16: ...he venting system being placed into operation while all other appliances connected to the venting system are not in operation WARNING Capacity VENT PIPE DIA in STANDARD CONCENTRIC Outdoor Exhaust Acce...

Страница 17: ...nt pipe is probably oversized for the single water heater or other appliance The vent should be checked for proper draw with the remaining appliance Exhaust Piping Route piping to outside of structure...

Страница 18: ...al in exhaust or intake terminations Doing so will cause freeze ups and may block the terminations IMPORTANT Table 4 Minimum Vent Pipe Lengths Capacity Min Vent Length 045 070 090 110 135 15 ft or 5 f...

Страница 19: ...6 21 70 70 48 13 93 92 73 73 69 10 31 16 65 65 43 8 88 87 68 68 64 Standard Termination Elevation 4 501 10 000 ft Number of 90 Elbows Used 1 1 2 Pipe 2 Pipe 2 1 2 Pipe 3 Pipe Capacity Capacity Capacit...

Страница 20: ...8 13 60 60 44 9 76 76 69 69 60 10 23 8 55 55 39 n a 71 71 64 64 55 Concentric Termination Elevation 4 501 10 000 ft Number of 90 Elbows Used 1 1 2 Pipe 2 Pipe 2 1 2 Pipe 3 Pipe Capacity Capacity Capac...

Страница 21: ...53 49 10 21 6 50 50 28 68 67 48 48 44 Standard Termination at Elevation 4 501 10 000 ft Number of 90 Elbows Used 1 1 2 Pipe 2 Pipe 2 1 2 Pipe 3 Pipe Capacity Capacity Capacity Capacity 45 70 90 110 1...

Страница 22: ...t Applications TYPICAL EXHAUST PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON DIRECT VENT APPLICATIONS RIGHT HAND DISCHARGE SHOWN SIDE VIEW 45 MAX 45 MAX 2 2 2 2 or 2 12 max EXHAUST TRANSITION 3 2 2 EXH...

Страница 23: ...Discharge Shown Intake Piping Figure 27 through Figure 30 This gas furnace may be installed in either direct vent or non direct vent applications In non direct vent applications when intake air will...

Страница 24: ...ill not be obstructed by loose insulation or other items that may clog the debris screen 2 If intake air is drawn from a ventilated attic Figure 31 or ventilated crawlspace Figure 32 the exhaust vent...

Страница 25: ...ons and 12 above the average snow accumulation At vent termination care must be taken to maintain protective coatings over building materials prolonged exposure to exhaust condensate can destroy prote...

Страница 26: ...A 3 in N A N A N A N A 8 8 7 7 13 13 1 Refer to 99 Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook 2 Poly Propylene vent pipe PP by Duravent and C...

Страница 27: ...randa porch deck or balcony 12 Equal to or greater than soffit depth 3 feet 9m 12 3 feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 0...

Страница 28: ...iances 10 000 pliances 10 000 Btuh 3kw and 50 000 pliances 50 000 Btuh 15kw 6 inches 152mm for appliances 10 000 Btuh 3kw 12 inches 305mm for appliances 10 000 Btuh 3kw and 100 000 Btuh 30kw 36 inches...

Страница 29: ...f terminations and 6 152 mm on sidewall terminations 3 On roof terminations the intake piping should terminate straight down using two 90 elbows see Figure 36 4 Exhaust piping must terminate straight...

Страница 30: ...t Concentric Wall Termination 71M80 69M29 OR 60L46 US 41W92 or 41W93 Canada Figure 42 Optional Vent Termination for Multiple Unit Installation of Direct Vent Wall Termination Figure 43 Direct Vent App...

Страница 31: ...grade or average snow accumulation B Horizontal separation between intake and exhaust C Minimum from end of exhaust to inlet of intake D Exhaust pipe length E Wall support distance from top of each p...

Страница 32: ...R EXHAUST LINES 12 305MM ABOVE AVE SNOW ACCUMULATION SIZE PER EXHAUST PIPE TERMINATION SIZE REDUCTION TABLE Figure 46 Non Direct Vent Field Supplied Wall Termination SIZE TERMINATION PER EXHAUST PIPE...

Страница 33: ...ermination Drain Trap assembled Figure 49 Kit 51W18 USA 15Z70 Canada Parts Identification and Assembly Exhaust from Furnace To Termination Exhaust from Furnace To Termination Kit 51W18 is shown Figure...

Страница 34: ...o not use copper tubing or existing copper condensate lines for drain line CAUTION 5 Figure 54 and Figure 55 show the furnace and evaporator coil using a separate drain If necessary the condensate lin...

Страница 35: ...ion using a separate drain Piping from furnace must slope down a minimum of 1 4 per ft toward trap Figure 55 Unit with Evaporator Coil Using a Separate Drain Figure 56 Evaporator Coil Using a Common D...

Страница 36: ...507961 01P Page 36 of 58 Issue 1933 Figure 58 Trap Drain Assembly Using 1 2 PVC or 3 4 PVC...

Страница 37: ...n in or through air ducts clothes chutes chimneys or gas vents dumb waiters or elevator shafts Center gas line through piping hole Gas line should not touch side of unit See Figure 60 and Figure 61 4...

Страница 38: ...ND INSTALLED GROUND JOINT UNION DRIP LEG MANUAL MAIN SHUT OFF VALVE Horizontal Application Right Side Air Discharge Gas Valve GROUND JOINT UNION DRIP LEG MANUAL MAIN SHUT OFF VALVE GROUND JOINT UNION...

Страница 39: ...16 42 530 15 01 490 13 87 460 13 03 430 12 18 400 11 33 1 1 2 38 1 1 610 40 894 2100 59 46 460 41 34 1180 33 41 990 28 03 900 25 48 810 22 94 750 21 24 690 19 54 650 18 41 620 17 56 2 50 8 2 067 52 5...

Страница 40: ...t switch near the furnace so that power can be turned off for servicing Table 9 Capacity Maximum Over Current Protection Amps 045B3 070B3 090C3 15 090C5 110C5 135D5 20 4 Before connecting the thermost...

Страница 41: ...thermostat the wiring to be done and any replacement of wire shall conform with the temperature limitation for Type T wire 63 F 35 C rise Connect a sufficiently sized wire with ground to the furnace s...

Страница 42: ...s a call for dehumidification Both the passive and active dehumidification methods described above can be utilized on the same furnace Circulating Airflow Adjustments Cooling Mode The units are factor...

Страница 43: ...blower remains energized until the limits are closed Fan On When the thermostat is set for continuous fan operation and there is no demand for heating or cooling a call for fan closes the R to G circu...

Страница 44: ...W1 W2 Heat Call Figure 68 Indoor Blower Operation High Heat W2 Call Figure 69 Indoor Blower Operation Call for Fan Percentage of High Stage Cooling Figure 70 Indoor Blower Operation Single Stage Cool...

Страница 45: ...hown by a red LED on the control board The control continuously monitors its own operation and the operation of the system If a failure occurs the LED will indicate the failure code The flash codes ar...

Страница 46: ...USE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING INSULATION THICKN...

Страница 47: ...G MATERIAL HAVING A TEMP RATING OF AT LEAST 90 c 3 PROPER POLARITY MUST BE OBSERVED FOR FIELD LINE VOLTAGE SUPPLY IGNITION CONTROL WILL LOCK OUT IF POLARITY IS REVERSED 4 FOR TEMPORARY SERVICE REPLACE...

Страница 48: ...075 1210 1370 Normal 815 980 1120 1255 720 885 1020 1135 1st Stage 595 760 865 980 Normal 540 660 785 890 485 600 695 790 GUH96T070B3M Temp Rise Speed Adjustment Heating CFM 0 0 8 w c Setting D Settin...

Страница 49: ...Normal 800 945 1100 1245 720 840 970 1115 1st Stage 625 710 830 950 Normal 565 670 760 860 520 610 685 785 GUH96T090C5M Temp Rise Speed Adjustment Heating CFM 0 0 8 w c Setting D Setting C Setting B...

Страница 50: ...rmal 1220 1405 1570 1795 1075 1270 1430 1635 1st Stage 935 1065 1245 1405 Normal 865 970 1145 1280 790 890 1025 1165 GUH96T135D5M Temp Rise Speed Adjustment Heating CFM 0 0 8 w c Setting D Setting C S...

Страница 51: ...Allowed Allowed Allowed Allowed Norm Allowed Allowed Factory Setting Allowed 10 Allowed Allowed Allowed Allowed GUH96T090C5M 10 Allowed Allowed Allowed Allowed Norm Allowed Allowed Factory Setting Al...

Страница 52: ...ight burners on this furnace Each time the thermostat calls for heat the burners will automatically light The ignitor does not get hot when there is no call for heat on these units Gas Valve Operation...

Страница 53: ...nt Gas Flow Approximate Capacity Seconds for One Revolution Natural LP 1 cu ft Dial 2 cu ft Dial 1 cu ft Dial 2 cu ft Dial 045 80 160 200 400 70 55 110 136 272 90 41 82 102 204 110 33 66 82 164 135 27...

Страница 54: ...reset switches are located on the front of the burner box Pressure Switch The pressure switch is located in the heating compartment on the cold end header box This switch checks for proper combustion...

Страница 55: ...f power to the furnace 2 Have a shallow pan ready to empty condensate water 3 Remove the clean out cap from the condensate trap and empty water Inspect the trap then reinstall the clean out cap Cleani...

Страница 56: ...on box 37 Reinstall the combustion air inducer and flexible no hub connector Reconnect the 2 pin plug to the wire harness 38 Reconnect drain tubes between flue collar and cold end header box 39 Secure...

Страница 57: ...Problems detected during the inspection may make it necessary to temporarily shut down the furnace until the items can be repaired or replaced Instruct the homeowners to pay attention to their furnace...

Страница 58: ...height of eight 8 feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment The sign shall read in print size no less than...

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