| DUCT HEATER CONSTRUCTION |
ALL HEATRIX DUCT HEATERS ARE BUILT TO CONFORM TO U.L. AND N.E.C.
REQUIREMENTS AND ARE LISTED FOR ZERO CLEARANCE. |
| HEATING ELEMENTS:
OPEN COIL
|
HEATERS SHALL BE BUILT USING TYPE "C" NICHROME WIRE (A GRADE
WIRE OPTIONAL), SUPPORTED IN A CERAMIC STEATITE FLOATING BUSHING. THE
CERAMICS ARE THEN SUPPORTED BY A GALVANIZED STEEL FRAME. STANDARD
SPACING FOR ELEMENT CROSS SUPPORTS IS 3 INCHES ON CENTER.ELEMENT FRAME
ASSEMBLIES ARE THEN MOUNTED INTO A GALVANIZED STEEL WRAP. GRADE
"A" WIRE IS AVAILABLE WHEN REQUESTED. |
| OVERTEMPERATURE PROTECTION |
ALL DUCT HEATERS ARE FURNISHED WITH AN AUTOMATIC DISC TYPE THERMAL
CUTOUT FOR PRIMARY PROTECTION, WITH A MANUALLY RESETABLE DISC TYPE
THERMAL CUTOUT FOR SECONDARY PROTECTION. EXCEPT "F" MODEL
WHICH USES A FUSABLE LINK AS SECONDARY PROTECTION. |
| INTERNAL WIRING |
ALL WIRING USED SHALL BE U.L. LISTED 105 C STANDARD WIRE. |
| OVER CURRENT
PROTECTION
|
ALL HEATERS SHALL BE FUSED IN ACCORDANCE WITH APPLICABLE U.L.
STANDARDS AND THE NATIONAL ELECTRIC CODE. CIRCUIT FUSING IS REQUIRED
WHEN A DUCT HEATER CIRCUIT OR CIRCUITS EXCEED 48 AMPS. IF THE CIRCUIT
DOES NOT EXCEED 48 AMPS THEN CIRCUIT FUSING IS NOT REQUIRED BY CODE BUT
MAY BE ADDED AS A FACTORY INSTALLED OPTION. |
| CONTROLS |
NUMEROUS CONTROL OPTIONS ARE AVAILABLE FOR HEATRIX DUCT HEATERS, ALL
OPTIONS ARE LISTED IN THIS CATALOG. ALL COMPONENTS ARE U.L./C.S.A.
LISTED. |
| FIELD WIRING |
ALL HEATERS WILL BE FURNISHED WITH LINE TERMINALS CAPABLE OF HANDLING
125% OF THE CONNECTED LOAD. HEATERS REQUIRING LARGER THAN 500 MCM
INCOMING FIELD FEED WILL BE SUBDIVIDED INTO SMALLER FEEDS TO MEET U.L.
REQUIREMENTS. |
| CONTROL PANEL
CONSTRUCTION
|
A MINIMUM OF 20 GAUGE GALVANIZED STEEL IS USED IN CONSTRUCTION OF ALL
HEATERS, HEAVIER GAUGES ARE USED ON LARGER MODELS. HEATERS INCLUDE SPOT
WELDED CONSTRUCTION, FALSE BOTTOM ON "M" MODELS, CONTINUOUS
NICKEL PLATED HINGED COVER FOR CONTROL PANELS ON ALL MODELS EXCEPT
"F" WHICH ARE CONSTRUCTED WITH A SCREW ON TYPE COVER.
"M" MODELS THAT DO NOT INCLUDE A DOOR INTERLOCK DISCONNECT
SWITCH INCORPORATE A SPRING LOADED LATCHING DEVICE IN THE COVER
ASSEMBLY. |
| SPECIAL CONSTRUCTION |
RECESSED ELEMENTS FOR INTERNALLY LINED DUCTS: SLIP & DRIVE
CONNECTIONS : FLANGED MOUNTING : BOTTOM OR TOP MOUNTING IN DUCT
: OUTDOOR ENCLOSURES : MODULAR HEATERS : HXOB TYPE FOR MOUNTING
DIRECTLY TO THE FAN DISCHARGE : REMOTE CONTROL BOXES. |
