Mestek NXIM-2 Installation Instructions Manual Download Page 24 | Manualshive

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GAS CONVERSION

Figure 21A – Gas Valve Adjustment Locations

(Sizes 100/200)

Figure 21B – Gas Valve Adjustment Location

(Sizes 300/400)

Run % Potentiometer

High Fire

Adjustment

Low Fire

Adjustment

Figure 21C – Run% Potentiometer on Control Board

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Summary of Contents for NXIM-2

Page 1: ...r s responsibility to inspect and correct any problem that may be found RECEIVING INSTRUCTIONS Inspect shipment immediately when received to determine if any damage has occurred to the unit during shi...

Page 2: ...ffolding or other apparatus required to perform emergency service or annual periodic maintenance to this equipment DESCRIPTION The High Efficiency Gas Fired Unit Heaters are factory assembled power ve...

Page 3: ...cated in this manual Use only the fuel for which the heater is designed see rating plate Using LP gas in a heater that requires natural gas or vice versa will create risk of gas leaks carbon monoxide...

Page 4: ...4 Figure 2 Dimensional Drawing High Efficiency Unit Heater CAT 10081B T CONNECTION CONNECTION FLUE P B H C A G J L K D E W U N SPECIFICATIONS...

Page 5: ...n Dia 2 3 4 4 51 76 102 102 P Flue Connection Diameter 2 2 4 4 51 51 102 102 Q Side Panel to Centerline Gas Connection 2 5 8 2 5 8 2 5 8 2 5 8 67 67 67 67 R Bottom Panel to Centerline Gas Connection 2...

Page 6: ...tat setting must be maintained If the ambient temperature drops to below freezing it may result in damage to heat exchanger and or components AIR FOR COMBUSTION The unit heater shall be installed in a...

Page 7: ...cal conduit for support Failure to heed these warnings may result in property damage personal injury or death Unit Heaters must be hung level from side to side and from front to back Failure to do so...

Page 8: ...5A THREADED INSERT LAG BOLT WASHER 3 8 THREADED ROD 2 X 6 LAG BOLTED ACROSS JOISTS JOIST WASHER NUT 22 216758 7 21 2 676 FRONT OF UNIT HEATER 300 400 SIZES CAT 10165A LAG BOLT WASHER 1 2 THREADED ROD...

Page 9: ...3 1 05 0 99 3 4 0 824 360 250 200 170 151 138 125 118 110 103 93 84 77 72 10 2 7 08 5 66 4 81 4 28 3 91 3 54 3 34 3 11 2 92 2 63 2 38 2 18 2 04 1 1 049 680 465 375 320 285 260 240 220 205 195 175 160...

Page 10: ...gas manifold and controls Supports should be spaced in accordance with the latest edition of ANSI Standard Z223 1 NFPA 54 National Fuel Gas Code in Canada according to CSA B149 4 To prevent the mixing...

Page 11: ...National Electrical Code ANSI NFPA No 70 or CSA Standard C22 1 THERMOSTAT WIRING AND LOCATION NOTICE The thermostat must be mounted on a vertical vibration free surface free from air currents and in a...

Page 12: ...12 ELECTRICAL CONNECTIONS continued Figure 7A Unit Wiring Diagram High Efficiency Unit Heater Size 100 Equipped with Natural or Propane LP Gas Modulating with Outside Air Reset Master...

Page 13: ...13 ELECTRICAL CONNECTIONS continued Figure 7B Unit Wiring Diagram High Efficiency Unit Heater Size 200 Equipped with Natural or Propane LP Gas Modulating with Outside Air Reset Master...

Page 14: ...14 ELECTRICAL CONNECTIONS continued Figure 7C Unit Wiring Diagram High Efficiency Unit Heater Size 300 400 Equipped with Natural or Propane LP Gas Modulating with Outside Air Reset Master...

Page 15: ...des with current CSA B149 1 Installation Codes for Natural Gas Burning Appliances and Equipment or CSA B149 2 Installation Codes for Propane Gas Burning Appliances and Equipment 2 Any reference to U S...

Page 16: ...5 2 m Equivalent length is total length of straight sections PLUS 5 feet 1 5 m for each 90 degree elbow and 2 5 feet 0 76 m for each 45 degree elbow 4 The vent terminal must be at least 12 inches 305...

Page 17: ...ar attach in place if not already factory mounted to outlet 3 The top of the vent pipe should extend at least 2 feet 0 61 m above the highest point on the roof within 10 feet 3 05 m of the termination...

Page 18: ...within the building on high efficiency unit heaters This can result in death serious injury or substantial property damage Use of cellular core pipe for any exhaust vent component is prohibited Use o...

Page 19: ...mm 24 610 mm MINIMUM FROM ADJACENT WALL OR BUILDING TO COMBUSTION 8 MINIMUM 204 mm CAT 10075A FLUE PIPE COMBUSTION AIR INLET PIPE FLUE PIPE COMBUSTION AIR INLET PIPE ROOF FLASHING REQUIRED AT ALL PENE...

Page 20: ...es 12 inches 305 mm is the minimum allowable length and 60 inches 1 5 m is the maximum allowable length for this dimension Only SDR 26 PVC ASTM D2241 may be used for extendingpipes Donotextendpipeswit...

Page 21: ...t 10 Check installation by allowing unit to run through one cycle Figure 14 Horizontal Concentric Vent Kit Installation SEPARATED COMBUSTION CONCENTRIC VENTING continued MAX 60 1524 mm 1 25 mm COMBUST...

Page 22: ...e to roof using metal strapping or equivalent support material field supplied refer to Figure 18 7 Install combustion air inlet cap and small diameter pipe assembly into roof Cement and fully insert s...

Page 23: ...remove the 6 screws that attach the mixing chamber to the combustion blower 9 Place mixing chamber on flat surface and unthread the 90 degree elbow from orifice nipple Then unthread the orifice nipple...

Page 24: ...Figure 21A Gas Valve Adjustment Locations Sizes 100 200 Figure 21B Gas Valve Adjustment Location Sizes 300 400 Run Potentiometer High Fire Adjustment Low Fire Adjustment Figure 21C Run Potentiometer...

Page 25: ...as Propane LP Gas to Natural Gas 100 1 3 4 CW 1 3 4 CCW 200 2 1 2 CW 2 1 2 CCW 300 2 1 2 CCW 2 1 2 CW 400 4 CCW 4 CW Note CW indicates clockwise rotation and CCW indicates counterclockwise rotation Un...

Page 26: ...stat will determine how the unit runs A Fan Only G demand will cause the unit run its propeller fan only A first stage demand W1 will cause the unit to run at the minimum input set by the Run potentio...

Page 27: ...ch and Master DIP Switch must be ON for the Master OPERATION HIGH EFFICIENCY PROPELLER UNITS DIRECT SPARK IGNITION continued The OADIP Switch must be ON for all Members All units must be connected usi...

Page 28: ...ter The GLOBAL DIP Switch must be set to ON for Members Each Member uses its own RUN potentiometer Run for the lowest input level All units must be connected using the Network communication ports Note...

Page 29: ...MS using the RS485 Modbus Port The MASTER Switch must be ON for the Master The GLOBAL DIP Switch must be set to ON for Members Each Member uses its own RUN potentiometer P1 for the lowest input level...

Page 30: ...t this ignition period for one minute The orange ignition LED will become solid OPERATION HIGH EFFICIENCY PROPELLER UNITS DIRECT SPARK IGNITION continued 6 Set Run potentiometerto100 onthecontrolboard...

Page 31: ...UDE DERATION This high efficiency unit heater has been manufactured utilizing standard burner orifices and gas pressure setting as per the specifications shown on the unit rating plate The main contro...

Page 32: ...H PRESSURE TAP 1 8 TUBING TO BULK HEAD FITTING ON FLUE COLLECTOR 1 8 TUBING TO BULK HEAD FITTING ON PARTION PANEL 1 8 TUBING TO GAS VALVE PRESSURE TAP ON SIZE 100 200 UNITS CONNECTION IS CAPPED ON SIZ...

Page 33: ...for 24V at gas valve terminals during trial for ignition period if present and valve does not open Replace valve 9 Clean condensate trap 10 Replace ignition control 11 Re install cap on tubing F Burn...

Page 34: ...eads and check amp draw of motor Replace if needed 3 Check for continuous 115V on molex plug on inducer and neutral during call for heat If not present and all checks are normal replace Q Power venter...

Page 35: ...ulty switch 4 Power venter is not working properly or producing correct delta pressure Red LED 3 Flash High Limit Switch Fault 1 Gas supply off or gas supply pressure too high 2 Unit is over fired 3 B...

Page 36: ...of the automatic gas valve by lowering the setting of the thermostat stopping the operation of the unit The gas valve should close tightly completely extinguishing the flame on the burners 9 Inspect...

Page 37: ...halogenated hydrocarbons precipitated in the air d to any workmanship of the installer of the Product 3 This limited warranty is conditional upon a advising the installing contractor who in turn noti...

Page 38: ...KET DRAFTER MOUNTING PLATE SELF DRILL SCREW 8 18 INDUCER THREADED HEX INSERT 10 24 FLUE COLLECTOR ASSEMBLY DRAFTER GASKET CAT 10085A MACHINE SCREW 10 24 MACHINE SCREW 6 32 AIR GAS INLET COVER PLATE IN...

Page 39: ...istance is needed contact the manufacturer s customer service department Unit Number Serial Number Part Description and Number as shown in Replacement parts Catalog TURBULATOR COMBUSTION TUBE COMBUSTI...

Page 40: ...W2 40005 Modbus Input 8 bit unsigned 1 0 Modbus Input see BMSTimer If no wired operating mode demands are present and the unit is operating per the Modbus Mode variable the unit will run at this inpu...

Page 41: ...Air Rest Limit 33 100 30011 Fault Code 8 bit unsigned Indicates the highest priority Fault set on the unit See the Fault Code Table 30012 Inducer Blower RPM 16 bit unsigned 1 0 Current RPMs of the in...

Page 42: ...V 1 115 1 60 5 230 3 60 2 208 1 60 6 460 3 60 3 230 1 60 7 575 3 60 4 208 3 60 Z Special Note Supply Voltages SV 2 7 include field mounted step down transformer 12 Motor Type MT 1 Open Drip Proof 13 B...

Page 43: ...you understand all the controls on this equipment If not contact your wholesaler or rep DO NOT START this equipment unless you fully understand the controls GAS EQUIPMENT START UP AND INSPECTION SHEE...

Page 44: ...260 NORTH ELM ST WESTFIELD MA 01085 TEL 413 564 5540 FAX 413 562 5311 www mestek com...

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