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PAGE 22 Reznor, AB - 2 Gas, GB 2019-08, D301177 Issue A

Part Replacement (Cont)

•  Air distribution fans

The air distribution fans can be accessed by 
removing the retaining screws securing the 
hinged lid on the underside of the air curtain. 
(See fig.51)

The lid can now be hinged down to access the 
fans as shown in figure 51.

• 

Fan closure plate

Remove the retaining screws around the 
perimeter of the plate  (see fig. 42/43) The 
plate can now be removed. Remove now 
the individual fansuele ventilatoren gaan 
verwijderen.

•  Fan removal

Identify the feed cable for the fan requiring    
removal and disconnect it from the terminal row 
located at the top of the unit. See fig. 44 and 
45.

The four bolts securing the fan can now 
be    removed as shown in fig.45 and the fan 
removed from the air curtain downwards.

These fans are heavy

Figure 52.   

Figure 51.   

Fan outlet

Fan closure plate

Figure 53.   

Figure 54.   

Figure 55.   

Figure 56.   

Summary of Contents for AB-2 Series

Page 1: ...s containing chlorinated or halogenated hydrocarbons or in applications with airborne silicone substances Should overheating occur or the gas supply fail to shut off shut off the manual gas valve to the appliance before shutting off the electrical supply Do not use this appliance if any part has been immersed in water Immediately call a qualified service technician to inspect the appliance and rep...

Page 2: ...tallation Details Cont 8 Wiring Details 8 Wiring Details Cont 9 Servicing 10 Servicing Cont 11 Servicing Cont 12 Commissioning 13 Commissioning Cont 14 Part Replacement 15 Part Replacement Cont 16 Part Replacement Cont 17 Part Replacement Cont 18 Part Replacement Cont 19 Part Replacement Cont 20 Part Replacement Cont 21 Part Replacement Cont 22 Part Replacement Cont 23 Fault Finding 24 Fault Findi...

Page 3: ...installation to familiarise yourself with the components and tools you require at the various stages The primary reason for installing gas fired air curtains is to prevent the influx of cold outside air through a door opening into a heated area Typical applications include large despatch bay doors in factories and warehouses and internal doors between areas of different temperatures Wider door ope...

Page 4: ...B 2 Gas GB 2019 08 D301177 Issue A Left side view Top view Mod A mm B mm C mm D mm E mm F mm Weight kg AB 175 2 1750 951 456 820 66 1692 160 AB 225 2 2250 951 456 820 66 2192 200 Figure 1 Dimensions tol 2mm Dimensions ...

Page 5: ... 3 4 3 7 4 4 3 Gas flow rate kg h 4 6 3 2 N of injectors 5 Injector size mm Ø3 4 Ø2 9 Ø3 4 Ø2 9 Ø1 85 Ø1 60 Injector pressure mbar 7 25 6 35 10 90 9 30 30 50 26 00 Flue nominal bore mm 130 I D fan Voltage 230 V 1 fasig 50 Hz Power Rating 120 W Current 0 9 A FLC Air Distribution Fans Type Centrifugal with integral thermal trip Speeds 2 N of fans 4 3 4 3 4 3 Max air volume 11000m3 hr AB 175 13000m3 ...

Page 6: ...vided kit DO NOT suspend from the heater cabinet panels Do not place or add additional weight to the suspended heater Mounting Reznor gas fired air curtains are supplied with mounting brackets pre fitted either as single units or in multiples which can be bolted together to suit various door widths The minimum mounting height is 1 8 metres Suspension by means of threaded rods De gas fired air curt...

Page 7: ...r curtain is optional to be specified on order form See figure 6 By using suitable steelwork the air curtains can be fixed to the building structure Multiple air curtains Multiple air curtains must be fixed to the building structure by means of threaded rods as described in section Suspension by means of threaded rods The use of fixing brackets to install the air curtains if optional see section S...

Page 8: ...terminated vertically See figures 8 9 Flue Technical Details Model AB 225 2 AB 175 2 Gas type Nat gas G20 Prop G31 Nat gas G20 Prop G31 Mass flow rate of flue gasses kg s 0 03337 0 0332 0 02576 0 0283 Flue gas temp At flue outlet ºC 188 173 189 5 187 Flue pressure positive Pa 8 8 Ventilation requirements In buildings having an air change rate of less than 0 5 per hour additional mechanical or natu...

Page 9: ...Reznor AB 2 Gas GB 2019 08 D301177 Issue A PAGE 7 Right Side View Side View Installation Details Cont Figure 8 Typical Vertcial Flue Arrangement Figure 9 Typical Horizontal Flue Arrangement ...

Page 10: ...refitting of the I D fan is described on page 19 of this manual parts replacement Note 1 The maximum permissible horizontal flue length should be calculated using the formula for equivalent flue sizes shown on the previous page Note 2 When the horizontal flue is to pass through a wall constructed of combustible material a suitable approved fireproof sleeve should be fitted prior to installing the ...

Page 11: ...the door interlock and thermostat and the off position turns the air curtain off A cool heat selector switch is also incorporated which allows the air curtain to supply heated air or unheated ambient air The panel also contains a removable link on the main terminal rail to allow the air curtain to be switched on and off remotely via a BMS control relay The panel may also be fitted with optional lo...

Page 12: ...explains how to remove the major components Manifold injectors Remove the manifold complete with injectors as described in section Parts Replacement The manifold injectors should be examined for signs of debris and cleaned if necessary by blowing compressed air in the reverse direction to flow Individual injectors can be replaced if necessary 6 2 2 Burners Access to the burners is achieved by firs...

Page 13: ...ing the secondary cooling impeller and the mesh aperture in the motor cover Check that the impeller is free to rotate and that there is no play in the bearings Emitter tubes External Brush away any dust on the exterior of the emitter tubes after first removing the ten screws retaining the mesh air inlet grille as shown in Figure 12 below Internal To gain access first remove the bottom cover as des...

Page 14: ... fans can be accessed by opening the fan lid as described in section 8 Clean off any dust or deposits with a soft brush paying particular attention to the impeller Check that the impeller spins freely and that there is no play in the fan bearings The fan s can be removed if necessary as described in section 8 Note Following any servicing work it will be necessary to re commission the air curtain S...

Page 15: ...y if the appliance has been on stand by for a prolonged period Air Curtain Lighting Sequence AB air curtains are fitted with automatic spark ignition When adequate airflow for combustion is proven by an air proving switch and a pre purge period has elapsed the integral igniter and gas control valve operate The ignition spark ignites the burner and the flame is detected by a flame ionisation rod se...

Page 16: ...ressure If necessary adjust as follows First remove the plastic dust cover from the regulator adjusting screw Turn the regulator adjusting screw anticlockwise to decrease gas pressure or clockwise to increase gas pressure See Figure 17 After adjustment replace dust cover Set control panel heat cool switch to the cool position to turn the burner OFF Replace the test point screw if removed Relight t...

Page 17: ...or gas soundness with a suitable leak detection fluid Tools Required Burner Control assembly The major components of the burner control assembly can be accessed by removing the 2 retaining screws from the door so that door can be opened see figure 18 19 It is also possible to take away the door In this case the earthing wires must firstly be detached from the burner relay Only then can the door be...

Page 18: ...igure 22 Then the four retaining nuts at the bottom of the lid can be removed see figure 23 Gas valve Disconnect the mains gas pipe feeding the air curtain Then remove the gas valve as shown in figure 24 To ease access to the gas valve remove the electric panel by unscrewing the 2 screws at the top of the appliance The panel can then be hung over the top panel side see figure 25 Part Replacement C...

Page 19: ...eeding pipe Follow above steps to disconnect the coupling between gas valve and gas feeding pipe By removing 3 screws the burner rack and the gas feeding pipe can be removed Move the burner rack forward and remove by performing a rotational motion See fig 27 28 The gas pipe can now be removed from the burner rack by unscrewing 4 screws See figure 29 Figure 30 shows a gas feeding line with injector...

Page 20: ... electric panel as described in 8 2 1 Remove the silicon tubing at the top of the air pressure switch as shown in figure 32 NB only a single tube is fitted to the air pressure switch on the negative pressure side Remove now the electrical connections Remove hereto the protection cap Then connections can be disconnected See figure 33 and 34 Part Replacement Cont Figure 31 Figure 32 Figure 33 Figure...

Page 21: ... ignition controller to the electric panel and then remove the controller as shown in figure 37 I D fan The I D fan is mounted on top of the unit towards the right hand side First remove the flue from the fan outlet Disconnect the mains plug from the fan and the silicon tubing at de side of the fan box Remove the four screws securing the fan to the unit Remove the fan fan box assy taking care not ...

Page 22: ...robe as shown in figure 40 Withdraw flame probe as shown in figure 41 Spark electrode Remove the HT cable from the ignition controller as shown in figure 42 Remove fixing screw as shown in figure 43 Withdraw spark electrode complete with HT cable as shown in figure 44 Part Replacement Cont Figure 39 Figure 40 Figure 41 Figure 42 Figure 43 Figure 44 ...

Page 23: ...ostat as shown in figure 46 Remove the 2 retaining screws as shown in figure 47 and remove thermostat Disconnect the connections from the self resetting thermostat as shown in figure 48 Remove the retaining screw securing the manual rest thermostat as shown in figure 49 Remove from location slot complete with bracket as shown in figure 50 Part Replacement Cont Figure 45 Figure 46 Figure 47 Figure ...

Page 24: ...retaining screws around the perimeter of the plate see fig 42 43 The plate can now be removed Remove now the individual fansuele ventilatoren gaan verwijderen Fan removal Identify the feed cable for the fan requiring removal and disconnect it from the terminal row located at the top of the unit See fig 44 and 45 The four bolts securing the fan can now be removed as shown in fig 45 and the fan remo...

Page 25: ...Reznor AB 2 Gas GB 2019 08 D301177 Issue A PAGE 23 Figure 51 shows for clarity a single air distribution fan Part Replacement Cont Figure 57 ...

Page 26: ...Item Description Part n Air distribution fan 01 27100 Thermal overheat control LC1 AB175N 2 03 24970 AB225N 2 03 24969 01 Exhaust fan 20 25749 Thermal overheat control LC3 03 24959 Gas valve natural gas 1 stage 03 25136 Ignition electrode 03 400US 42 Plug wire gas valve 03 25136 V1 Flame probe 03 401US 195292 Burner relay 03 25322 Illuminated resettoggle switch 60 61988 Pressure switch 30 60618 42...

Page 27: ...ch tube 2 Emitter tubes air inlet vent for obstructions 3 Operation of vacuum switch 4 Replace fan Does the vacuum switch pull in Check 1 Ignition controller 2 Wiring harness Is the burner sparking Check 1 Integrity of spark leads 2 Integrity of spark electrode assembly spark gap 3 Ignition controller Check 1 Ignition controller 2 Replace gas valve Does the gas valve open If the heater still fails...

Page 28: ...f Single fan unit off If the fan s still fail to operate normally please contact the Reznor Service Department Check 1 Control panel man off auto switch position 2 Fan circuit breaker 3 Fan contador and associated wiring Check 1 Motor thermall trip may run when cool test motor 2 Motor wiring 3 Motor plug socket YES YES YES NO NO Fault Finding Cont ...

Page 29: ...l and the lockout lamp on the control panel will illuminate The lockout can be reset by pressing the illuminated rocker switch on the burner panel or the control panel lockout reset button providing the lockout condition has cleared If lockout re occurs switch off air curtain and call out a service engineer To switch off the AB air curtain Rotate the auto off manual control panel switch to the off...

Page 30: ...PAGE 28 Reznor AB 2 Gas GB 2019 08 D301177 Issue A ...

Page 31: ...Reznor AB 2 Gas GB 2019 08 D301177 Issue A PAGE 29 ...

Page 32: ...sales nortek com www reznor eu Nortek Global HVAC is a registered trademark of the Nortek Global HVAC limited Because of the continuous product innovation Nortek Global HVAC reserves the right to change product specification without due notice This document replaces the previous Manual Part No D301177 Current full Part No Reznor AB 2 Gas Installation Manual EN 2019 08 D301177 Issue A ...

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