Справочник Пользователя для Roberts Gorden WHA XS Series

A.  Vent Box: The vent box shall be of [aluminized steel] [409 

stainless steel].

B.  Flue Fan: Each unit shall have a factory-installed flue fan to draw 

combustion gases through the heat exchanger and into the flue 

venting. No unit shall be gravity vented. The flue fan shall be 

internally mounted by the manufacturer. No combustion draft 

inducers shall be mounted outside of heater cabinet.  

C.  Combustion Air: For non-separated units, the combustion 

air shall be drawn into the unit's exposed burner box directly 

from the heated space through openings in the access door. For 

separated units, the combustion air shall be drawn from outside 

the heated space into the unit's enclosed burner box through 

a piece of flexible duct that terminates at an exterior cabinet 

flange. Ductwork shall be run from that flange to the building 

penetration.

D.  Flue and Combustion Air Connections: The flue collar and 

combustion air collar (if applicable) shall be located on the rear 

of the unit. For Models 30 - 125, heater design shall allow for the 

shifting of the venting and combustion air collars to the top of 

the cabinet in the field.

A.  Fan: Each unit is supplied with one (Models 30-250) / two 

(Models 300-400) axial fan(s).  

B.  Fan Guard: Each axial fan is covered with a fan guard.  The 

guard shall protect against objects ½" (12 mm) and greater in 

diameter.  

C.  Motor: The motor shall be an open drip-proof (ODP), standard 

efficiency design, wired for 120 V/ 1 Ø / 60 Hz.  The motor shall 

be shaded pole (SP) (Models 30 - 75) / permanent split capacitor 

(PSC) (Models 100 - 400).

A.  Factory Testing: The complete control system and burner 

and gas manifold functions shall be factory tested for proper 

operation and to simplify field commissioning.

B.  Control Enclosure: Burner controls (transformer, ignition 

module, gas valve, safety switches) shall be internally 

mounted by the manufacturer. No burner controls or gas train 

components shall be mounted outside of heater cabinet.

C.  Safety Controls:
  1.  Air Flow Switch: The air flow switch measures air pressure    

  differential across the heat exchangers to verify blower  

 

  operation and the presence of an adequate supply of  

 

  combustion air. The gas valve cannot open until the air flow  

  switch is satisfied.

  2.  High Temperature Limit Switch: The high temperature limit  

  switch shall turn the burners off when air is discharged above  

  its set point. The switch ensures unit shut down in case of    

  axial fan failure or any problem which may result in  

 

  overheating.

D.  Controls System: Units shall be equipped for use with 120 V / 

1 Ø / 60 Hz power supply. All units shall be factory equipped 

with a 24 V thermostat control terminal strip on the outside of 

the cabinet, pre-wired to heater internal controls. Thermostat 

control terminal shall allow for 2-wire heating control or 4-wire 

heating and “fan only” control. 

A.  Shelf-Mounting Bracket Kit (Available for Models 30-125 Only):  

The shelf-mounting bracket kit shall provide a manner in which 

to mount a unit to an existing shelf.  

B.  Wall Suspension Mounting Bracket Kit (Available for Models 

30-125 Only): The wall suspension mounting bracket kit shall 

provide a wall-mounted structure from which a unit can be 

suspended.  

C.  Wall Shelf Mounting Bracket Kit (Available for Models 30-125 

Only): The wall shelf mounting bracket kit shall provide a wall-

mounted shelf structure on which a unit can be mounted.

D.  Vertical Louver Kit (Available for Models 30-125 Only): The 

vertical louver kit shall provide a means to control horizontal air 

flow.

E.  Concentric Vent Kit: The concentric vent kit allows the flue 

and combustion air to be consolidated into a single concentric 

vent, thereby minimizing the number of required wall/roof 

penetrations. The kit consists of a concentric vent box, a 4" (101 

mm)vent terminal with baffle plate and a 6" (152 mm) (Models 

30-250) / 8" (203 mm) (Models 300-400) combustion air 

terminal.

F.  Fuel Conversion Kit: The fuel conversion kit allows for 

field-conversion of the type of gas supplied to the unit. The 

kit consists of a replacement spring for the gas valve and 

replacement orifices.

A.  See Schedule on plans.