ICP NUGM100EHB1 Installation Guide

• Safety Rules

• Installation

• Ventilation Air

• Vent & Combustion Piping

• Gas Supply & Piping

• Wiring

• Ductwork Connections

• Start-Up

• Maintenance

Design Certified

Printed in U.S.A.

Manufactured by:

Inter-City Products Corporation (USA)

Lavergne, TN USA 37086

by AGA.

NUGMSeries

CondensingGasFurnace

LP1 1008854 3J8/94

_ Condensing Gas Furnace Installation Instructions I

Table of Contents

1. Safety Labeling andSignalWords .............. 3

Danger, Warning and Caution .................. 3

Danger Label ............................... 3

Warning Label .............................. 3

Caution Label .............................. 3

2. Safe Installation Requirements ................ 4

3. Installation ................................ 6

Dual Certified Furnace ......................... 6

Location and Clearances ....................... 6

Installation Requirements ...................... 6

False Floor Closet Installation ................... 9

4. Combustion & Ventilation Air .................. 10

Venting and Combustion Air Check ............... 10

Air Openings and Connecting Ducts .............. 10

Confined Space Installation ..................... 10

Requirements ....................... . ...... 10

Unconfined Space Installation ................... 12

Unusually Tight Construction ................... 12

Ventilation Air ............................... 12

5. Vent and Combustion Air Piping ................ 13

Dual Certified Furnace ......................... 13

Contaminated Combustion Air ................... 13

Vent and Combustion Air Piping Guidelines ........ 13

Piping Insulation Guidelines ................... 14

Sizing Combustion Air and Vent Pipe ............. 14

Vent Termination Clearances .................. 16

Condensate Drain Trap and Neutralizer ........... 16

Connecting Furnace and Piping ................. 16

Vent Pipe Connection ........................ 17

Air Inlet Pipe Connection ...................... 17

Joining Pipe and Fittings ...................... 18

Connecting Vent Pipes and Termination ........... 18

Vertical Termination .......................... 18

Horizontal Termination ....................... 18

Using Extedor Risers ......................... 19

Optional Vent Screens ........................ 19

Vent Termination Shielding .................... 19

6. GasSupplyand Piping ....................... 20

Supply Pressure .............................. 20

General U.S. Derating Rules ................... 20

General Canadian Derating Rules ............... 20

Manifold Gas Pressure Adjustment ............... 20

High Altitude Air Pressure Switch ................ 21

Changing Orifices for High Altitude ............... 21

Natural Gas Input Rating Check ................. 21

Gas Piping Requirements ...................... 22

Connections ................................ 22

Additional LP Connection Requirements .......... 22

Final Check ................................. 23

Startup ..................................... 23

7. Electrical Wiring ............................ 24

Grounding .................................. 24

Polarizing ................................... 24

Labeling .................................... 24

Power Supply ................................ 24

Thermostat ................................. 24

Heat Anticipator ............................. 24

Optional Equipment .......................... 25

Humidifier/Electronic Air Cleaner ................ 25

Wiring for Air Conditioning ..................... 25

Fan Control ................................. 25

S. Ductwork and Filter ......................... 26

Installation .................................. 26

Connections ................................ 26

Sizing ..................................... 26

Insulation .................................. 26

Filters ..................................... 26

Filter Installation ............................. 27

Addition Of Air Conditioning .................... 27

9. Checks and Adjustments ...................... 2g

Main Burner Flame Check ..................... 29

Pilot Burner Flame Check ...................... 29

Limit Control Check .......................... 29

Fan Control Check ........................... 30

Temperature Rise Check ...................... 30

Continuous Fan Operation ..................... 31

Separate speed selections for Heat, Cool, and

Continuous Fan ............................. 31

Heating and Continuous BLower Speed the Same ... 31

10. Furnace Maintenance ....................... 32

Filters ..................................... 32

Replacement ............................... 32

Blower Motor ................................ 32

Furnace Inspection ........................... 32

Vent Pipe .................................. 32

Return Air Duct .............................. 32

Furnace Base ............................... 32

Furnace Intedor ............................. 33

Pilot Burners ................................ 33

Main Burners ............................... 33

Condensate Disposal ......................... 33

11. CleaningHeat Exchangers.................... 34

Primary Heat Exchanger ....................... 34

Accessing .................................. 34

Cleaning ................................... 34

Secondary Heat Exchanger .................... 34

Accessing .................................. 34

Extedor Cleaning ............................ 34

Accessing Intedor of Secondary Heat Exchanger ... 34

Interior Cleaning ............................. 34

Cleaning Burners ............................ 35

Reassembly ................................ 35

12. Glossary of Terms ........................... 36

13. Appendix of Helpful Information ............... 37

Canadian Codes ............................. 37

Applicable Natural Gas and Propane Codes ....... 37

Applicable Electrical Codes .................... 37

United States Codes .......................... 37

Applicable Natural Gas and Propane Codes ....... 37

Applicable Electrical Codes .................... 37

I.Condensing Gas Furnace

1, SafetyLabelingandSi0nalWords

Installation Instructions I

Danger,Warning and Caution

The signal words DANGER, WARNING and CAUTION are used to identify levels of hazard seriousness. The signal word DANGER isonly used on product labels to signify an immediate hazard. The signal words WARNING and CAUTION will

be used on product labels and throughout this manual and other manuals that may apply to the product.

DangerLabel

White lettering on a black background except the word DANGER which is white with a red background.

DANGER

Immediate hazards which WILL result in severe personal injury or death.

WarningLabel

WARNING

Hazards or unsafe practices which COULD result in

severe personal injury or death.

White _ettering on a black background except the word WARNING which is black with an orange background.

The signal word WARNING is used throughout this manual in the following manner:

CAUTION

Hazards or unsafe practices which COULD result in minor

personal injury or product or property damage.

The signal word CAUTION is used throughout this manual in the following manner:

CAUTION

CautionLabel

White lettering on a black background except the word CAUTION which is black with a yellow background.

_ Installation Instructions Condensin_l Gas Furnace I

2. SafeInstallationRequirements

Installation or repairs made by unqualified persons can result in hazards to you and others.

Installation MUST conform with local codes or, in the absence of local codes, with codes of the

country having jurisdiction. See Appendix.

The information contained in this manual is

intended for use by a qualified service technician

familiar with safety procedures and equipped

with the proper tools and test instruments.

Failure to carefully read and follow all instruc-

tions in this manual can result in furnace

malfunction, property damage, personal injury and/or death.

NOTE: This furnace is design certified by the American

Gas Association and the Canadian Gas Association for in- stallation in the United States and Canada. Refer to the ap-

propriate codes, along with this manual, for proper installation.

• This furnace is NOT approved for installation in mobile homes, trailers or recreation vehicles.

• Do NOT use this furnace as a construction heater.

• Use only the Type of gas approved for this furnace

(see Rating Plate on unit). Overfiring will result in

failure of heat exchanger and cause dangerous op-

eration.

• Ensure adequate combustion and ventilation air is provided to the furnace.

• Seal supply and return air ducts.

• The vent system MUST be checked to determine that it is the correct type and size.

• Install correct filter type and size.

• Unit MUST be installed so electrical components are protected from direct contact with water.

NOTE; It is the personal responsibility and obligation of the customer to contact a qualified installer to ensure that the installation is adequate and conforms to governing codes

and ordinances.

Carbon Monoxide Poisoning Hazard. This furnace can NOT be common vented or

connected to any type B, BW or L vent or vent connector, nor to any portion of a factory-built or

masonry chimney. If this furnace is replacing a previously common-vented furnace, it may be

necessary to resize the existing vent line and chimney to prevent oversizing problems for the other remaining appliance(s). See applicable codes in appendix and Venting and Combustion

Air Check in Gas Vent Installation section. This furnace MUST be vented to the outside.

Failure to properly vent this furnace or other appliances can result in property damage,

personal injury and/or death.

• Do NOT use open flame to test for gas leak.

I Condensing Gas Furnace

installation Instructions

START-UP CHECK SHEET

(Keep this page for future reference)

Dealer Name:

Address:

City, State(Province), Zip or Postal Code:

Phone: Owner Name:

Address:

City, State(Province), Zip or Postal Code:

Model Number:

Serial Number:.

Type of Gas: Natural: [_1 LP: _1

Business Card Here

Manual Gas Shut-Off Upstream of Furnace/Drip-Leg?

Drip-Leg Upstream of Gas Valve?

Condensate Drain Connected? YES _1 NO [_

Blower Speed Checked? YES CI NO [_1

All Electrical Connections Tight? YES _1 NO {_1

YES 1_1 NO [_1

YES {_1 NO _1

Blower Motor H.P.:

Supply Voltage:.

Limit Opens at...(°F) or(°C)__

Limit Closes at...(°F) or(°C).__

Which blower speed tap is used? (Heating). (Cooling)

Temperature of Supply Air: (°F) or(°C).__

Temperature of Return Air: (°F)__. or(°C).__

Rise (Supply Temp - Return Temp): (°F) or(°C)__

Filter Type and Size:

Fan "Time ON" Setting:.

Fan 'q'ime OFF" Setting:

Gas Valve OK? YES CI NO[_I

Measured Line Pressure When Firing Unit:

Calculated Firing Rate:(See ChecksandAdjustmentsSec- tion).

Measured Manifold Pressure:

Thermostat OK?

Subbase Level?

Anticipator Set?

Breaker On? YES [_1

Date of Installation:

Date of Start-Up:

YES O NO

YESI_I NOel

YES_I NO _1 Set At?:

NO _1

Dealer Comments:

_ Installation Instructions Condensin_l Gas Furnace I

3. Installation

NOTE: Installation MUST conform with local building codes and local plumbing and waste water codes, or inthe

absence of local codes, with codes of the country having

jurisdiction. See Appendix.

DualCertified Furnace

This furnace is dual certified. This means that the INLET

pipe is optional. See Figure "1for identification of INLET and OUTLET pipe. Combustion air can be drawn from out-

side the structure or inside the structure. If drawing com- bustion air from inside the structure, adequate make up air

MUST be provided to compensate for oxygen burned. See

Confined Space Installation in the Combustion and

Ventilation Air chapter.

LocationandClearances

1. Referto Figure 1 fortypicaldirectventornon_:lirect

vent installation and basicconnecting parts required.

Supply and return air plenums and duct are also re- quired.

If furnace is a replacement, it is usually best to install

the furnace where the old one was. Choose the loca- tion or evaluate the existing location based upon the

minimum clearance and furnace dimensions (Figure 2).

Installation Requirements

1. Install furnace level.

2. This furnace is NOT to be used for temporary heat of buildings or structures under construction.

3. Install furnace as centralized as practical with re- spect to the heat distribution system.

4. Install the vent pipes as short as practical. (See Vent and Combustion Air Piping section).

5. Maintain clearance for fire safety and servicing. A front clearance of 30" (762mm) is recommended for access to the burner, controls and filter.

CAUTION

Special precautions MUST be made if installing furnace in an area which may drop below freezing. This can cause improper operation or damage to

equipment. If furnace environment has the potential of

freezing, the drain trap and blower must be protected

with antifreeze. Disconnect the rubber coupling on top of furnace and pour 8 onces of sanitary type (RV) antifreeze into the vent pipe to protect the blower and drain trap from freeze damage.

Do NOT operate furnace in a contaminated

atmosphere containing chlorine, fluorine or any other damaging chemicals. Refer to Combustion &

Ventilation Air section, Contaminated Combustion

Air,

6. Use a raised base if the floor is damp or wet at times.

7. Residential garage installationsrequire:

• Burners and ignition sources installed at least 18 inches(457mm) above the floor.

• Located or physically protected from possible dam- age by a vehicle.

61ZJ

I Condensing Gas Furnace Installation Instructions

Figure I Typical Installation

* 8"(200ram) Min.

20'(6m) Max.

in same atmospheric zone

--q

ipe is

Optional

Vent Pipes MUST be supported Horizon- tally and Vertically

Tee to prevellt a_rlc<tk

Tee for overflow

I NLE:T

Inlet Pipe is

* Increase minimum from 8" to 18" for cold climates

(substained temperatures below 0 °F),

7LZ.J

_ Installation Instructions Condensin_lGas Furnace J

Figure 2 Dimensions and Clearances

I' 10 7_"

BACK DRAIN

CONNECTION

Cabinet Clearances

TOP BOT RH LH BACK FRNT FLUE 1" 0 0 0 0" 3 0"

93/16.

U_IT

CAPACPTY

S00CO 7SCO0

_00.000 125CC_

/CONWnSION

G,_S¢ON_ECTIO_S ORAIN CONNE¢ n_

AIG_T SIDE L_" SIO_ RdGH_SlOE

N I P N _, n s

t/2" i 2_-_B" :_,___- _.1_16. t _,_- 4._t_

ze 1_"=724

lt2-=$s

1o 7_.=_76

_.1F_=_7o

LEm" SlO_

S • V

7r_-_

nETURNApR

_)TTOM SIDE

J L I M

2_.tm. 23 IFZ" 22.1_2" I _ lrZ"

_LUE O,_TL_T

_" 2 _I_S" _.7_16_

231_'_7

14_'_'=375 2.V_.=S 4

2_._

I Condensing Gas Furnace

False FloorClosetInstallation

NOTE: This type of installation is in a closet with the fur-

nace placed over an opening in a false floor raised above

the regular floor (Figure 3). False floor closet installation

MUST be made in accordance with local building and fire

codes.

1. If an existing closet is being reworked, shorten and frame the door so the door bottom is above, or flush

with the location of false floor.

2. Construct a level framework of 2 x 4's or 2 x 6's

around the inside of the closet. Make the top of the false floor at least 12 inches(30Omm) above existing

floor.

3. Cut a piece of plywood (for the false floor) to fit tightly inside the closet, but do NOT install yet.

NOTE: Plywood MUST be A-C exterior glued or approved

for underlayment use, with a minimum 3/4inch thickness.

Maximum size is 4' x 4' unless supported by adequate

bracing with any joints in the false floor tightly sealed.

Installation Instructions I

Set the furnace on the plywood in proper position. Open front access panel and mark inside of bottom

opening on plywood. Cut opening in the plywood.

Unless existing floor is concrete, place a piece of

sheet metal on existing floor under position of open-

ing in false floor. Sheet metal should be 2 inches

wider in both directions than opening and centered

under opening.

Apply silicone or butyl rubber caulking around top of frame work and install false floor. Seal around edge of false floor and any joints.

Apply a bead of caulking around opening in false floor and set furnace over opening so the bottom is

sealed.

Cut return air openings and box them in so they are sealed from the wall and open ONLY into the area

below the false floor and the return air opening in bot-

tom of furnace.

Direct vent models de NOT require ventilation air.

10.

Adequate combustion air openings MUST be pro- vided if piping unit as non-direct vent (one pipe). See

Combustion and Ventilation Air chapter.

Figure3 I Typical Closet False Floor Installation

Min. 3/4 inch A-C exterior

glued plywood

Sheet metal pan centered

under furnace

Cross Supports to prevent sagging

Seal bottom of furnace and edge

of wood floor

Return Air

S22

I Installation Instructions Condensin_lGas Furnace J

4. Combustion& VentilationAir

NOTE: Ifflame pulls towards draft hood, this indicates suf-

ficient infiltration air.

Carbon monoxide Poisoning Hazard. Use methods described here to provide com-

bustion and ventilation air.

Figure 4 _ Vent Check

Failure to provide adequate combustion and

ventilation air can result in personal injury

and/or death.

VentingandCombustionAir Check

NOTE: This section ofthe manual applies to this furnace IF venting as a non-direct vent (single pipe) appliance.

The following information is supp[iedto allow the installer to make adjustments to the setup ofexisting appliances, IF

NEEDED. These instructions are presented to be used for

reference ONLY IF NEEDED, based on good trade prac- tices, local codes, and good judgment of the installer.

Manufacturer does NOT take responsibility for modifica- tions made to existing equipment.

NOTE: If this installation removes an existing furnace from a venting system serving one or more other appliances,

and to make sure there is adequate combustion air for all appliances, MAKE THE FOLLOWING CHECK.

Seal any unused openings in the venting system.

Visually inspect the venting system for proper size and horizontal pitch to ensure there is no blockage or restriction, leakage, corrosion or other deficiencies

which could cause an unsafe condition.

3. Insofar as is practical, close all doors and windows and all doors between the space in which the appli- ance(s) remaining connected to the venting system are located and other spaces of the building.

4. Turn on clothes dryers and any appliance not con- nected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not oper- ate asummer exhaust fan. Close fireplace dampers.

Vent Pipe --_1 I A/ DraftHood

Typical Gas

Water Heate_l_l _ _,P_._ Match

NOTE: Non-direct vent appliances occupying same en- closed space as furnace MUST have enough air for proper combustion and ventilation. All duct or openings for supply- ing combustion and ventilation air must comply with the gas and electrical codes of the country having jurisdiction. See Appendix.

When the installation is complete, check that all appliances have adequate combustion air and are venting properly. See Venting And Combustion Air Check in this manual.

Air Openingsand Connecting Ducts

1. Total input rating for all non direct vent gas appli- ances, includingfurnace, MUST be considered when determining free area of openings.

2. Connect ducts or openings directly to outside.

3. When screens are used to cover openings, they MUST be no less than 1/4inch(6mm) mesh.

4. The minimum dimension of rectangular air ducts MUST NOT be less than 3 inches(75mm).

5. When sizing grille or louver, use the free area of opening. If free area is NOT stamped or marked on grillor louver, assume a 20% free area for wood and

60% for metal.

ConfinedSpaceInstallation

NOTE: A confined space is defined as an area with less

than 50 cubic feet(1.4m 3)per 1,000 BTUH input rating for

all gas appliances installed in the area.

5. Follow the lighting instructions for each appliance be- ing inspected. Adjust thermostat so appliance(s) will operate continuously.

6. Allow 5 minutes of main burner operation, then check for spillage at the draft hood relief opening of each

appliance. Use the flame of a match or candle

(Figure 4).

After it has been determined that each appliance vents properly, return doors, windows, appliances

etc. to their normal condition.

If improper venting is observed, the cause MUST be

corrected using the appropriate tables in code books of country having jurisdiction. See Appendix for list-

ing of applicable codes.

Requirements

1. Provide confined space with sufficient air for proper combustion and ventilation of flue gases using hori- zontal or vertical ducts or openings.

2. Figure 6, Figure 7, and Figure 8 illustrate how to provide combustionand ventilation air. A minimum of two permanent openings, one inletand one outlet,

are required.

3. One opening MUST be within 12 inches(300mm) of the floor and the second opening within 12

inches(300mm) of the ceiling.

4. Size openings and ducts per Figure 5.

5. Horizontal duct openings require 1 square

inch(25sq, mm) offree area per 2,000 BTUH ofcorn-

I Condensing Gas Furnace

Installation Instructions

bined input for all gas appliances in area (see

Figure 5).

Vertical duct openings or openings directly to outside require I square inch(6.Smm 3)of free area per 4,000 BTUH for combined input of all gas appliances in area (see Figure 5).

Free Area

Figure 5

STUH

Input

Rating

50,000 75,000

100,000

. 125,000

150,000

Minimum Free Area Required for Each Opening

Horizontal Duct

(2,000 BTUH)

25 sq. in.(161 cm 2)

35.5 aq. in.(242 cm 2

50 sq. in.(323 cm2I

62.5 sq. in.(403 cm z 71 sq. in.(484 cm 2)

(other appliances)

Vertical Duct or

openings to outside

(4,000 BTUH)

12.5 sq, in.(81 em2)

15.75 sq. in.(121 cm 2

25 sq. in.!161 cm 2)

31.25 sq. in.(202 cm2)

37.5 sq. in.(242 cm 2)

EXAMPLE: Determining Free Area

Appliance 1 Appliance 2 Total Input

100,000 + 30,000 = (130,000 + 4,000) 2210cm 2

Appliance 1 Appliance 2 Total Input

100,000 + 30,000= (130,000 + 2,000)= 4tgcm 2

(32.5 Sq. In.) Vertical)

(65 Sq. In.) Horizontal)

Round

Duct

(4,000

BTUH I

6 _

7,,

Figure 7

Gas Vent

NOTE:Drawing air from attic is

NOT allowed in Canada.

Minimum One Inlet and One Outlet Air Supply is Required

May be in any Combination Shown

Inlet Air Opening Must be Within 12" (3O0mm) of floor Outlet Air Opening Must be Within 12" (300mm) of ceiling

(1) 1 Square ineh(6cm2) per 4000 Btuh

Providing Combustion &

Ventilation Air (Except Canada)

Soffit Vent

(1)

I Providing Combustion &Figure 6 Ventilation Air

Gas Vent

Outlet Air (1) Outlet

tn II liAr'2'

I Ilpels I I_-I II It

ptional

Air (1) _ilre_2)

Minimum One Inlet and One Outlet Air Supply is Required

Inlet Air Opening Must be Within 12" 130Omm) of floor Outlet Air Opening Must be Within 12 (300ram) of ceiling

May be in any Combination Shown

(1) 1 Square inch(6cm2) per 4000 Btuh (2) 1 Square inch(6cm2) per 2000 atuh

Figure 8 Ventilation Air

Minimum One Inlet and One Outlet Air Supply is Required

Inlet Air Opening Must be Within 12" 1,300mm) of floor

Outlet Air Opening Must be Within 12 (300ram) of ceiling

(1) 1 Square inch(6cm2) per 4000 Btuh (2) 1 Square inch(6cm2) per 2000 Btuh r

I Providing Combustion &

Gas Vent _ Gable Vent

Ventilated Attic_

Top Above Insulatioif_

t Air (1) ! Soffit

I Vent

May be in any Combination Shown

I Installation Instructions

Condensing]Gas Furnace I

Unconfined SpaceInstallation

Carbon Monoxide Poisoning Hazard.

Most homes will require additional air,

An unconfined space or homes with tight con- struction may not have adequate air infiltration

for proper combustion and ventilation of flue gases,

Failure to supply additional air by means of venti- lation grilles or ducts could result in personal in- jury and/or death•

An unconfined space is defined as an area having a mini-

mum volume of 50 cubic feet(1.4m 3)per 1,000 Btuh total input rating for all gas appliances in area. Refer to Figu re 9

for minimum area required.

NOTE: Refer to definitions in section titled Unusually Tight Construction and the Appendix. If any one of the conditions

apply, the space MUST be considered confined space re- gardless of size.

1. Adjoining rooms can be considered part of an uncon- fined area if there are openings without doors be- tween rooms.

An attic or crawlspace may be considered an uncon- fined space provided there are adequate ventilation openings directly to outdoors. Openings MUST re- main open and NOT have any means of being closed off. Ventilation openings to outdoors MUST be at

least 1 square inch(25mm 2) of free area per 4,000

BTUH of total input rating for all gas appliances in

area.

4. Air inlet MUST be screened with not less than 1/4 inch(6mm) mesh screen.

UnusuallyTightConstruction

In unconfined spaces, infiltration may be adequate to pro-

vide air for combustion, ventilation and dilution of flue gases. However, in buildings with unusually tight construc-

tion, additional air MUST be provided using the methods described in section titled Confined Space Installation:

If any one of the following conditions are present, the

space MUST be treated as confined space.

1. Walls and ceilings exposed to the outside have a continuous, sealed vapour barrier. Openings are

gasketed or sealed.

2. Doors and openable windows are weather stripped.

Other openings are caulked or sealed. These include joints around window and door frames, between sole

plates and floors, between wall-ceiling joints, be- tween wall panels, at penetrations for plumbing,

electrical and gas lines, etc.

Figure 10

Screen / Area

This _,_

Min 12" /

Fresh Air Duct

F Inlet Air Fresh

Air Duct

Figure 9 Unconfined Space

BTUH Input Minimum Area 1 Sq. Inch

Rating in Square Feet per 4,000 BTUH

50,000 312(29m 2) 4"(100ram)

78,000 490(46m 2) 5"(127mm)

114,000 712(66m _) 6"(152m m)

155,000 968(90m=) T'(178m m)

EXAMPLE: NOTE: Square feet is based on 8 foot ceilings,

28,000 BTUH X 50 Cubic Ft. = 1,400 -- 175 Sq. Ft.

1,000 8' Ceiling Height

Install air intake a minimum of 12" (300mm) above maximum snow level and clear of any obstruction.

Duct or ventilation opening requires one square inch of free area per 4,000 BTUH of total input rating for all gas appliances in area. Refer to Figure 10 for typical

fresh air duct installation.

Minimum Area in Square Feet

Round Duct Size

Furnace

6"(150mm) Min.

18"(460mm) Max.

Ventilation Air

Some provincial codes and local municipalities require ventilation or make-up air be brought into the conditioned space as replacement air.Whichever method is used, the mixed return air temperature across the heat exchanger MUST not fall below 60°F (15° c) or flue gases will con- dense in the heat exchanger. This will shorten the life of the heat exchanger and possibly void your warranty.

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