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The operation of exhaust fans, kitchen ventilation fans,
clothes dryers, or fireplaces could create a NEGATIVE
PRESSURE CONDITION at the furnace. Make-up air MUST
be provided for the ventilation devices, in addition to that
required by the furnace.

All fuel-burning equipment must be supplied with air for combus-
tion of the fuel. Sufficient air MUST be provided to ensure there
will not be a negative pressure in the equipment room or space. In
addition, a positive seal MUST be made between the furnace
cabinet and the return-air duct to avoid pulling air from the burner
area and blocked vent safeguard opening.

The requirements for combustion and ventilation air depend upon
whether the furnace is located in an unconfined or confined space.

UNCONFINED SPACE — An unconfined space must have at
least 50 cu ft for each 1000 Btuh of input for all the appliances
(such as furnaces, clothes dryer, water heaters, etc.) in the space.

If the unconfined space is of unusually tight construction, air for
combustion and ventilation MUST come from either the outdoors
or spaces freely communicating with the outdoors. Combustion
and ventilation openings must be sized the same as for a confined
space as defined below. Return air must not be taken from the
room unless an equal or greater amount of air is supplied to the
room.

CONFINED SPACE

A confined space is defined as a space whose volume is less than
50 cu ft per 1000 Btuh of total input ratings of all appliances
installed in that space. A confined space MUST have provisions
for supplying air for combustion, ventilation, and dilution of flue
gases using 1 of the following methods. (See Fig. 3, 4, and Table
2.)

NOTE:

In determining free area of an opening, the blocking

effect of louvers, grilles, and screens must be considered. If free
area of louver or grille design is unknown, assume that wood
louvers have a 20 percent free area and metal louvers or grilles
have a 60 percent free area. Screens, when used, must not be
smaller than 1/4-in. mesh. Louvers and grilles must be constructed
so they cannot be closed.

The size of the openings depends upon whether air comes from
outside of the structure or an unconfined space inside the structure.

1. All air from inside the structure requires 2 openings (for

structures not usually tight):

a. Each opening MUST have at least 1 sq in. of free area per

1000 Btuh of total input for all equipment within the
confined space, but not less than 100 sq in. per opening.
(See Fig. 3 and Table 2.) The minimum dimension of air
openings shall not be less than 3 in.

b. If building is constructed unusually tight, a permanent

opening directly communicating with the outdoors shall be
provided. See item 2 below.

c. If furnace is installed on a raised platform to provide a

return-air plenum, and return air is taken directly from
hallway or space adjacent to furnace, all air for combustion
must come from outdoors.

2. Air from outside the structure requires 1 of the following

methods:

a. If combustion air is taken from outdoors through 2 vertical

ducts, the openings and ducts MUST have at least 1 sq in.
of free area per 4000 Btuh of total input for all equipment
within the confined space. (See Fig. 4 and Table 2.)

b. If combustion air is taken from outdoors through 2 hori-

zontal ducts, the openings and ducts MUST have at least 1
sq in. of free area per 2000 Btuh of total input for all
equipment within the confined space. (See Fig. 4 and Table
2.)

c. If combustion air is taken from outdoors through a single

opening or duct (horizontal or vertical) commencing within
12 in. of the top of the confined space, opening and duct
MUST have at least 1 sq in. of free area per 3000 Btuh of
the total input for all equipment within the confined space
and not less than the sum of the areas of all vent connectors
in the confined space. (See Fig. 4 and Table 2.) Equipment
clearances to the structure shall be at least 1 in. from the
sides and back and 6 in. from the front of the appliances.

When ducts are used, they must be of the same cross-sectional area
as the free area of the openings to which they connect. The
minimum dimension of ducts must not be less than 3 in. (See Fig.
4.)

AIR DUCTS

Never connect return-air ducts to the side or back of the
furnace. A failure to follow this warning can cause a fire,
personal injury, or death.

Step 1—General Requirements

The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA) or
American Society of Heating, Refrigerating and Air Conditioning
Engineers (ASHRAE). Or consult factory The Air Systems Design
Guidelines 
reference tables available from your local distributor.
The duct system should be sized to handle the required system
design CFM at the design static pressure.

When a furnace is installed so that the supply ducts carry air to
areas outside the space containing the furnace, the return air must
also be handled by a duct(s) sealed to the furnace casing and
terminating outside the space containing the furnace.

Secure ductwork with proper fasteners for type of ductwork used.
Seal supply- and return-air duct connections to furnace with code
approved tape or duct sealer.

Flexible connections should be used between ductwork and
furnace to prevent transmission of vibration. Ductwork passing
through unconditioned space should be insulated to enhance
system performance. When air conditioning is used, a vapor
barrier is recommended.

Maintain a 1-in. clearance from combustible materials to supply air
ductwork for a distance of 36 in. horizontally from the furnace. See
NFPA 90B or local code for further requirements.

For Example:

58RAV FURNACE

INPUT BTUH

MINIMUM SQ FT

WITH

7-1/2 FT CEILING

46,000

307

69,000

460

92,000

613

115,000

767

135,000

920

5

Summary of Contents for 58RAV 170 Series

Page 1: ... literature on tags and on labels attached to or shipped with the unit and other safety precautions that may apply In the United States follow all safety codes including the National Fuel Gas Code NFGC NFPA 54 1999 ANSI Z223 1 1999 and the Installation Standards Warm Air Heating and Air Condition ing Systems NFPA 90B ANSI NFPA 90B In Canada refer to the CAN CGA B149 1 and 2 M95 National Standard o...

Page 2: ...o be installed in a furnace follow items 1 through 5 before bringing the control or yourself into contact with the furnace Put all used AND new controls into containers before touching ungrounded objects 7 An ESD service kit available from commercial sources may also be used to prevent ESD damage Table 1 Dimensions In UNIT SIZE A D E VENT CONN SHIP WT LB 050 08 14 3 16 12 9 16 12 11 16 4 121 050 1...

Page 3: ...inances especially those that may not have kept pace with changing residential construction practices We require these instructions as a minimum for a safe installation Application of this furnace should be indoors with special attention given to vent sizing and material gas input rate air temperature rise and unit sizing Improper installation or misapplication of the furnace can require excessive...

Page 4: ...e ample space for servicing and cleaning Always comply with the minimum fire protection clearances shown on the unit rating plate This furnace shall not be installed directly on carpeting tile or any combustible material other than wood flooring The furnace may be installed on combustible flooring when installed with the accessory downflow subbase which is available from your distributor or branch...

Page 5: ...jacent to furnace all air for combustion must come from outdoors 2 Air from outside the structure requires 1 of the following methods a If combustion air is taken from outdoors through 2 vertical ducts the openings and ducts MUST have at least 1 sq in of free area per 4000 Btuh of total input for all equipment within the confined space See Fig 4 and Table 2 b If combustion air is taken from outdoo...

Page 6: ...The return air duct must be connected to return air opening inlet provided as shown in Fig 1 DO NOT cut into casing sides or back to attach any portion of return air duct Bypass humidifier connec tions should be made at ductwork or coil casing sides exterior to furnace Fig 3 Confined Space Air for Combustion and Ventilation from an Unconfined Indoor Space A93387 RETURN AIR 6 MIN FRONT SUPPLY AIR V...

Page 7: ...rking platform on location where all required furnace clearances are met See Fig 2 and 8 INSTALL FURNACE 1 Position furnace in desired location 2 Connect gas supply pipe See Fig 8 for typical piping entry 3 Install field supplied filter retainers as indicated in Fig 11 and Table 4 before connecting return air duct to furnace Table 3 Opening Dimensions In FURNACE CASING WIDTH APPLICATION PLENUM OPE...

Page 8: ...ed on a Combustible Floor A96284 CD5 OR CK5 COIL ASSEMBLY OR KCAKC COIL BOX FURNACE SHEET METAL PLENUM FLOOR OPENING COMBUSTIBLE FLOORING Fig 8 Typical Attic Installation A97516 30 IN MIN WORK AREA 6 MIN TYPE B VENT GAS ENTRY 24 24 SHEET METAL SEDIMENT TRAP MANUAL SHUTOFF GAS VALVE LINE CONTACT ONLY PERMISSIBLE BETWEEN LINES FORMED BY INTERSECTIONS OF THE TOP AND TWO SIDES OF THE FURNACE JACKET AN...

Page 9: ...ect to the furnace and to the meter If a flexible connector is required or allowed by the authority having jurisdiction black iron pipe shall be installed at the gas valve and extend a minimum of 2 in outside the furnace casing Use the proper length of pipes to avoid stress on the gas control manifold Failure to follow this warning could result in a gas leak causing fire explosion personal injury ...

Page 10: ...r 115 v wiring If polarity is incorrect control center status code indicator light will flash rapidly and furnace will not operate Fig 10 Horizontal Crawlspace Installation on Hanger Rods A96633 NOTES ANGLE IRON OR EQUIVALENT ROD LOCATION USING DIMPLE LOCATORS SEE DIMENSIONAL DWG FOR LOCATIONS 3 8 IN ROD 1 A 1 In clearance minimum between top of furnace and combustible material 2 The entire length...

Page 11: ... or controller manufacturer s instructions for proper connec tion A failure to follow this warning could result in fire NOTE A field supplied 115 v controlled relay connected to EAC terminals may be added if humidifier operation is desired during blower operation Step 11 Venting Refer to the national or local installation code such as NFGC in the United States or the NSCNGPIC in Canada for proper ...

Page 12: ...own for proper operation Some thermostats require a C terminal connection as shown If any of the original wire as supplied must be replaced use same type or equivalent wire W Y GND THERMOSTAT TERMINALS 1 2 3 Fig 14 Furnace Control A99255 HUMIDIFIER TERMINAL 24 VAC 0 5 AMP MAX LED OPERATION DIAGNOSTIC LIGHT HARNESS CONNECTOR 24 V TRANSFORMER SEC 2 SPARE 1 SPARE 2 EAC 1 EAC ELECTRONIC AIR CLEANER TE...

Page 13: ...t sensed the control closes the gas valve and repeats the ignition cycle NOTE Ignition sequence will repeat 3 additional times before a lockout occurs Lockout automatically resets after 3 hrs or can be manually reset by turning 115v off not at thermostat for 3 sec minimum then on again f Blower on delay Forty five sec after burner flame is proven the blower motor is energized on heating speed Simu...

Page 14: ...VAC CONDUCTOR ON PCB FIELD WIRING TERMINAL FIELD GROUND EQUIPMENT GROUND FIELD SPLICE PLUG RECEPTACLE L1 L2 L1 BLWR HI LO TO 115VAC FIELD DISCONNECT NOTE 4 EQUIPMENT GROUND SPARE 2 HEAT SPARE 1 COOL NOTE 7 COM HSIR EAC 1 START OL COM HI MED HI MED LO LO BLWM SCHEMATIC DIAGRAM NATURAL GAS PROPANE EAC 2 1 1 HSI 2 PL5 2 PL2 3 PL3 PR2 115VAC PR1 TRAN 24VAC 1 2 IDR TEST TWIN FU1 NOTE 6 CAP L2 PL1 8 FSE...

Page 15: ...ignal is present at control Component test sequence is as follows a Momentarily jumper TEST and COM 24V terminals until LED goes off b LED will display previous status 4 times c Inducer motor starts and continues to run for entire com ponent test d Hot surface igniter is energized for 15 sec then de energized e Blower motor operates on cooling speed for 10 sec then stops f Blower motor operates on...

Page 16: ... 43 2 8 43 2 9 43 3 0 43 3 1 4500 1025 43 2 6 43 2 6 43 2 7 43 2 8 43 2 9 ALTITUDE RANGE FT AVG GAS HEAT VALUE AT ALTITUDE BTU CU FT SPECIFIC GRAVITY OF NATURAL GAS 0 58 0 60 0 62 0 64 0 66 Orifice No Manifold Pressure Orifice No Manifold Pressure Orifice No Manifold Pressure Orifice No Manifold Pressure Orifice No Manifold Pressure U S A Only 750 42 3 4 42 3 6 42 3 7 42 3 8 41 3 5 775 42 3 2 42 3...

Page 17: ...43 2 4 43 2 5 43 2 5 43 2 6 850 43 2 2 43 2 2 43 2 3 43 2 4 43 2 5 875 43 2 0 43 2 1 43 2 2 43 2 3 43 2 3 ALTITUDE RANGE FT AVG GAS HEAT VALUE AT ALTITUDE BTU CU FT SPECIFIC GRAVITY OF NATURAL GAS 0 58 0 60 0 62 0 64 0 66 Orifice No Manifold Pressure Orifice No Manifold Pressure Orifice No Manifold Pressure Orifice No Manifold Pressure Orifice No Manifold Pressure U S A Only 625 43 3 4 43 3 6 43 3...

Page 18: ...te cu ft hr X heating value Btu cu ft using natural gas heating value from local gas utility supplier EXAMPLE 0 2000 ft altitude Btu heating input Btu cu ft X cu ft hr Heating value of gas 1050 Btu cu ft Time for 1 revolution of 2 cu ft dial 82 sec Gas rate 88 cu ft hr from Table 9 Btu heating input 88 X 1050 92 400 Btuh In this example the orifice size and manifold pressure adjustment is within 2...

Page 19: ...e blower motor has started See the thermostat manufacturer s instructions for adjusting the heat anticipator and for varying the heating cycle length Table 9 Gas Rate Cu Ft Hr SECONDS FOR 1 REVOLUTION SIZE OF TEST DIAL SECONDS FOR 1 REVOLUTION SIZE OF TEST DIAL 1 cu ft 2 cu ft 5 cu ft 1 cu ft 2 cu ft 5 cu ft 10 11 12 13 14 360 327 300 277 257 720 655 600 555 514 1800 1636 1500 1385 1286 50 51 52 5...

Page 20: ...ire harness c Turn on 115 v power to furnace d Set thermostat to call for heat and wait 1 minute When pressure switch is functioning properly hot surface igniter should NOT glow and control diagnostic light flashes a status code 31 If hot surface igniter glows when inducer motor is disconnected shut down furnace immediately Determine reason pressure switch did not function properly and correct con...

Page 21: ...cal Codes ____________ 1 4 in Upward Slope ____________ Joints Secure ____________ See Attached Vent Table Instructions CHECKLIST START UP ____________ Gas Input Rate Set Within 2 percent of Rating Plate ____________ Temperature Rise Adjusted ____________ Thermostat Anticipator Setting Adjusted or ____________ Thermostat Cycle Rate 3 cycles per Hr CHECK SAFETY CONTROLS OPERATION ____________ Prima...

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Page 24: ...e Training plus hands on the products in our labs can mean increased confidence that really pays dividends in faster troubleshooting fewer callbacks Course descriptions and schedules are in our catalog CALL FOR FREE CATALOG 1 800 962 9212 Packaged Service Training Classroom Service Training Copyright 2000 CARRIER Corp 7310 W Morris St Indianapolis IN 46231 58ra16si Manufacturer reserves the right ...

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