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MORTEX

 

PRODUCTS

 

INC

 

501

 

TERMINAL

 

RD

 

FORT

 

WORTH,

 

TX

 

76106

 

Page

 

1

 

INSTALLATION MANUAL 

 

DOWNFLOW ONLY GAS FURNACE                                                                                                       

 

SIZES 60, 70, 77, 90 
MODELS: G18D SERIES   

 

 

CATEGORY I MOBILE HOME GAS FURNACE 

 

LIST OF SECTIONS 

– 

Safety      1 

– 

Combustion 

Air 

and 

Vent 

System 

   19 

2 – General Information 

 

 

 

 

7 – Furnace Startup, Diagnostics and Sequence of Operation 

27 

3 – Furnace Duct connections and Duct System 

  8 

8- 

Blower 

Performance 

    32 

4 – Gas Supply and Valve Connections  

  10 

– 

Wiring 

Diagrams 

    33 

5 – Line and Low Voltage Wiring 

 

 

 

14 

 

LIST OF FIGURES 

1 - Furnace Dimensions 

 

 

 

 

18 – Typical Single Stage Heat / Cool Digital T’stat 2 Stage Furnace  18 

2 – Duct Connector Dimensions 

 

 

 

19 – Typical 2 Stage Heating/Cooling Digital T’stat Connections 

18 

3 – Duct Connector and Floor Base Installation   

 

20 – Roof Jack Mounting Collars – Top of Furnace 

 

20 

4 – Air Distribution System – Single Trunk Duct   

 

21 – Roof Jack Indoor Extension Pipes   

 

 

20 

5 – Air Distribution System – Double Trunk Duct  

 

22 – Roof Jack Outdoor Extension Pipes 

 

 

20 

6 – Air Distribution Systems – Graduated trunk duct 

 

23 – Roof Jack Assembly (Slope Saddle) 

 

 

21 

7 – Furnace Base Openings, Fuel, Electric & A/C Line Penetrations  9 

24 – Roof Jack Crown Assembly 

 

 

 

21 

8 – Duct Connector Depths   

 

 

 

25 – Combustion Air Path thru the Roof Jack & Thru the Pipes 

22 

9 - Outdoor Fresh Air Intake Knockout  

 

 

10 

26 – 

Outside Ambient Combustion Air Openings and Ducts

 23 

10 – White Rodgers 36J29 Gas valve   

 

 

11 

27 – Home Layout and Vent Clearances 

 

 

24 

11 – Supply Gas Piping 

 

 

 

 

11 

28 – Outside Combustion Air and Vent Safety Check Procedure 

25 

12- Furnace Component Locations 

 

 

 

16 

29 – Typical Roof Jack Installation  

 

 

 

26 

13 – Separate T’stat, Furnace & Cooling Unit WD 

 

17 

30 – Reading the Inlet (Supply) Gas Pressure (INP) 

 

29 

14 – Separate T’stat, furnace, Cooling Unit & Trans W.D.   

17 

31 – Reading the Outlet (Manifold) Gas Pressure   

 

29 

15 – Same T’stat, Separate Furnace, Cooling Unit & Trans W.D. 

17 

32 – Integrated Control Board 

 

 

 

30 

16 – Same T’stat Separate Furnace, Heat Pump and Transformers 

18 

33 – Wiring Diagram A/C Ready Furnace 

 

 

33 

17 – Same T’stats Separate Furnace, Cooling Unit and Transformers  18 

34 - Wiring Diagram Heating Only 

 

 

 

34 

 

 

LIST OF TABLES 

1 – Furnace Clearances to Combustibles 

 

 

10 – Recommended Thermostat Wire Colors & Connections 

19 

– 

Model 

Nomenclature 

    7 

11 

– 

Estimated 

Free 

Area 

    22 

3 – High Altitude Gas Orifice Chart 

 

 

 

13 

12 – Vent Clearances 

 

 

 

 

24 

4 – Gas Pipe Capabilities 

 

 

 

 

14 

13 – 

Roof 

Jack 

Specifications 

    26 

5 – Ratings and Physical Electrical Data 

 

 

14 

14 – Input Calculations for a cu-ft Gas Meter 

 

 

28 

6 – Heating Only Models 1/3 HP Blower and Motor Rating  

15 

15 – Input calculations for a Mj/m³ Gas Meter 

 

 

28 

7 – A/C Ready Models 1/3 HP Blower & Motor Rating 

 

15 

16 – Inlet (Supply) Gas Pressure Range  

 

 

29 

8 – A/C Ready Models 3/4 HP Blower & Motor Rating 

 15 

 

17 

– 

Blower 

Performance 

    32 

9 – Low Voltage, Wire Gage and Max Lengths   

 

16 

 

SECTION I: SAFETY 

 

This is a safety alert symbol. When you see this symbol on 

labels or in manuals be alert to the potential for personal injury. 
Understand and pay particular attention to the signal words 

DANGER, WARNING, 

or 

CAUTION. 

 

DANGER:

 indicates an 

imminently

 hazardous situation, which if 

not avoided, 

will result in death or serious injury. 

WARNING:

 indicates a 

potentially

 hazardous situation, which if 

not avoided, 

could result in death or serious injury. 

 

CAUTION:

 indicates a 

potentially

 hazardous situation, which if 

not avoided, 

may result in minor or moderate injury.

 It is also 

used to alert against unsafe practices and hazards involving 
property damage. 

 

SAVE

 

THIS

 

MANUAL

 

FOR

 

FUTURE

 

REFERENCE

 

 

 

Содержание G18D SERIES

Страница 1: ...30 Reading the Inlet Supply Gas Pressure INP 29 14 Separate T stat furnace Cooling Unit Trans W D 17 31 Reading the Outlet Manifold Gas Pressure 29 15 Same T stat Separate Furnace Cooling Unit Trans W...

Страница 2: ...enting system Verify the furnace is operating according to the manufacturer s instructions 11 When installed in a Manufactured Mobile Home The combustion air shall not be supplied from occupied spaces...

Страница 3: ...he voltage exceeds 132 VAC This furnace must be installed so the components are protected from water Installing and servicing heating equipment can be hazardous due to the electrical and gas fired com...

Страница 4: ...btain the model and serial numbers so the correct parts can be ordered The furnace supply air blower is designed for correct performance with this furnace Do not attempt alter or use a different type...

Страница 5: ...rom gas supply line should be performed as described in ANSI Z223 1 latest edition National Fuel Gas Code or in Canada in CAN CGA B149 1 or B149 2 codes 5 Do not attempt to reuse any mechanical or ele...

Страница 6: ...OR ACCESS Ample clearances should be provided to permit easy access to the appliance The following minimum clearances are recommended 1 Twenty four 24 inches 61 cm between the front of the furnace and...

Страница 7: ...hat the requirements of this subdivision cannot be met at the time of completion of the installation the owner shall have thirty 30 days to comply with the above 48 requirements provided that during t...

Страница 8: ...mper is full heating or full cooling position Figure 2 Duct Connector Dimensions Floor Base Installation and Duct Connection Downflow combustible floor base is used for installations on combustible ma...

Страница 9: ...g the furnace be sure you have enough clearance to install the furnace and clearance for the return air Refer to Table 1 CLEARANCES 2 Remove the top shipping cover and corner posts 3 Remove the upper...

Страница 10: ...d velocity of 300 feet per minute 91 44 m minute cannot be used on the furnace return air louvered door because the air velocity is too high and will destroy the filter The filter velocity with this f...

Страница 11: ...2 1 27 cm Table 4 allows for a 0 3 W C 0 075 kPa pressure drop in the ON OFF Pressure Convertable OUT P IN P VENT Manifold Pressure Tap Electrical Terminals Gas Supply Line Pressure Tap GAS FLOW Switc...

Страница 12: ...natural gas orifice into the bag and hang it on the gas valve 11 Place the gas valve mounting bracket on the burner mounting plate and secure with the screws you removed in step 5 12 Reconnect the el...

Страница 13: ...48 72AG 081 0 081 46 72AG 082 0 082 45 72AG 089 0 089 43 10 000 72AG 073 0 073 49 72AG 078 0 078 47 72AG 081 0 082 46 72AG 089 0 089 43 60 00 BTU FURNACE 70 00 BTU FURNACE 77 00 BTU FURNACE 90 00 BTU...

Страница 14: ...ized Proper methods for field installing electrical wiring i Between the furnace and devices not attached to the furnace ii Between the separate devices that are field installed and located iii Exteri...

Страница 15: ...Current 60 HZ 0 49 0 49 0 49 0 49 Total Unit Amps 2 54 2 54 2 54 2 54 Model G18D060CA3BA G18D070CA3BA G18D077CA3BA G18D090CA3BA Blower Motor HP 1 3 1 3 1 3 1 3 Blower Mortor SPD 5 5 5 5 Blower Motor...

Страница 16: ...e routed through side of furnace and connect to the pig tail wires located above the control box The thermostat wires should also be no smaller than 22 gauges Refer to Table 9 for recommended wire gau...

Страница 17: ...use located on the left side of the control board that protects the 24 VAC circuit Replace the fuse only with the equivalent 3 Amp Automotive type fuse Separate Heating and Cooling Thermostats If the...

Страница 18: ...ypical Single Stage Heating Cooling Digital Thermostat with Two Stage Furnace Figure 19 Typical Two Stage Heating Cooling Digital Thermostat Connections Typical Heat Pump Heating Cooling Thermostat Wi...

Страница 19: ...not less than 17 percent The combustion system is fan assisted This Category I direct vent furnace is designed for Manufactured Home and Modular Home applications It may be installed without modifica...

Страница 20: ...rews or rivets Figure 20 Roof Jack Mounting Collars Top of Furnace VENTING INTO AN EXISTING ROOF JACK The furnace shall not be connected to another manufacturers factory built roof jack vent system If...

Страница 21: ...per installation of the roof jack requires that openings in the roof and ceiling be on the same vertical center line as the furnace flue collar 2 Once the hole has been cut into the roof insert the ro...

Страница 22: ...1000 BTU hr The calculation would be the 50 cubic ft per 1000 BTU hr by the 80 000 BTU Input of all appliances 50 x 80 4000 ft 7 Determine ratio of the available volume to the required volume 2400 ft...

Страница 23: ...ply with local codes and requirements NOTE The Roof Jack venting system is considered a special venting system Important Consideration must be given for degradation of building materials by flue gases...

Страница 24: ...window or door that may be opened 12 inches 30 cm for models 100 000 BTUH 30 kW 36 inches 91 cm for models 100 000 BTUH 30 kW 4 Feet 1 22 m C Clearance to permanently closed window 12 inches 30 cm 12...

Страница 25: ...enting systems are permitted and must be installed in accordance with the National Fuel Gas Code ANSI Z223 1 NFPA 54 and or the CSA B149 1 Natural Gas and Propane Installation Codes local codes and th...

Страница 26: ...T C ADJUSTIBLE HEIGHT 90 RJF1729 AL 17 29 FLAT 73 85 94 5 106 5 90 RJF2551 AL 25 51 FLAT 81 107 102 5 128 5 90 RJS1729 AL 17 29 3 12 73 85 94 5 106 5 90 RJS2551 AL 25 51 3 12 81 107 102 5 128 5 90 RJS...

Страница 27: ...liance connected to the venting system being placed into operation while all other appliances connected to the venting system are not in operation 1 Seal any unused openings in the venting system 2 In...

Страница 28: ...for a CU FT Gas Meter The formula for the input calculation of the appliance if you re heating value is in Mj m you using a cubic meter gas meter Example calculating the input for an appliance operati...

Страница 29: ...the gas valve Follow the procedure to shut off the furnace located in the Users Information Manual 5 Turn the switch on the gas valve to the OFF position 6 Turn off the gas supply at the ball valve o...

Страница 30: ...als HEAT 120 VAC Blower speed tap connection for heating speed COOL 120 VAC Blower speed tap connection for cooling speed XFMR 120 VAC connection to the transformer L1 120 VAC incoming power supply to...

Страница 31: ...try If flame is not established on the first trial for ignition period the gas valve is de energized and the inducer remains energized for an inter purge period of 25 seconds The ignitor is then re e...

Страница 32: ...ndoor blower motor on heat speed the other outputs will be kept off and the control will display a LED fault code of 5 When flame is no longer sensed the induced draft motor will run through post purg...

Страница 33: ...t be per the following A National Electrical Code NEC and or B Canadian Electrical Code CEC and or C State County Local Regional or City Codes 2 If any origional Factory wire must be replaced then rep...

Страница 34: ...ys are integrated into the control board Notes 1 All field wiring must be per the following A National Electrical Code NEC and or B Canadian Electrical Code CEC and or C State County Local Regional or...

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