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Heatrex
P.O. Box 515,
Meadville, PA 16335
Phone: (814) 724-1800
Fax: (814) 333-6580
E-mail: sales@heatrex.com
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Cooling Tower Control Panels



Heatrex offers a pre-engineered, UL Listed/CSA Approved package for freeze protecting cooling tower basins.

The complete package consist of :

  • Electric Immersion Heater(s)
  • Control Panel with Solid-State Printed Circuit Board
  • Sensor Probe with Cord
  • Wiring Diagram
  • Installation and Operating Instructions

Heatrex offers the following options :

  • Disconnect Switch
  • Fuses
  • Circuit Breaker





Standard Features  · Advantages  · Listing

Standard Features
  • Solid-State Control : Pre-set 45° F ON/OFF temperature control with 5° F switching differential and built-in low water cutoff. Circuit board LED’s provide visual indication of heater-on and liquid level status.
  • Ambient Temperature Range : -40° F to 150° F
  • Fail Safe : Output relay is de-energized if the input sensor is either open or short-circuited. This prevents heater burnout problems.
  • NEMA 4X enclosure with pre-mounted electrical hubs for conduit connections.
  • Single probe to sense both water temperature and water level. Sensor probe supplied with 12-foot outdoor rated cord pre-connected to control panel. Probe also supplied with PVC hub connector for attachments through cooling tower basin wall.
  • Nameplate showing maximum kW and amp ratings at system volts/phase.
  • System Wiring Diagram.
  • Installation and Operating Instructions.
  • Rated for maximum of 40 amps or 50 amps with disconnect switch when specified.
  • Suitable for multiple heaters per basin (maximum of 2 on 40 amp panel).
  • Disconnect switch with door interlock and operator handle, which can be padlocked in the "OFF" position.
  • Dimensions :
    8" x 10" x 6" for 40 amp size
    10" x 12" x 7" for 50 amp size
    14" x 16" x 8" for two circuits
  • Control panels rated greater than 50 amps are supplied with two circuits and offered either with built-in fusing or a circuit breaker for each circuit.




Advantages
  • Solid-State Control
    Outmoded bulb and capillary control has been replaced with new patented solid-state technology which combines temperature control with low water level protection in a single solid-state device.
  • NEMA 4X Enclosure
    Most controls are factory wired inside a rugged NEMA 4X enclosure designed for wet, outdoor use. Pre-engineered designs up to 96 amps are available with stock and built-to-order listings, two circuit panels use a NEMA 4 enclosure.
  • Lower Cost
    Installation time and cost are reduced by replacing individually mounted temperature and liquid level control devices with one pre-engineered and assembled control package that requires only one probe to sense both water temperature and level.
  • Sensor Probe Specifications :
    • Sensor Probe : Heatrex probe assembly incorporating both temperature and liquid level sensors. Probe is made out of 316 stainless steel to minimize corrosion. Probe can be installed vertically or horizontally.
    • Maximum Pressure Rating for Sensor Probe : 15 psi
    • Cord : 12-foot outdoor rated cord with PVC hub connector for installation through tower basin wall. Options include different cord lengths or cord suitable for total immersion.




Listing
Table 1- Stock Control Panel Listing
Max. Panel Amps  Number of circuits Maximum Panel KW Rating Catalog Number HX-874Z (plus & digit below) Dimensions of Enclosure
Voltage/ 1 Phase Voltage/ 3 Phase Standard Controls With Disconnect Switch
    120 208 240 480 208 240 480      
40 1 4.8 8.3 9.6 19.2 14.2 16.6 33.2 100000 103100 8"x10"6
50 1 6 10.4 12 24 18 20.7 41.5 101000 104100 10"x12x7
Table 2- Built-To-Order Control Panel Listing
Max. Panel Amps Number of circuits Maximum Panel KW Rating Catalog Number HX-874Z (plus & digit below) With Circuit Breaker & Disconnect Max. Dimensions of Enclosure Based on 480 Volt Rating
Voltage/ 1 Phase Voltage/ 3 Phase With Fusing With Fusing & Disconnect With Circuit Breaker
    120 208 240 480 208 240 480          
24 1 2.8 4.9 5.7 11.5 8.6 9.9 19.9 106200 120400 113300 128500 14"x16"x8"
32 1 3.8 6.6 7.6 15.3 11.5 13.2 26.5 107200 121400 114300 129500 14"x16"x8"
40 1 4.8 8.3 936 19.2 14.4 16.6 33.2 108200 123400 115300 131500 14"x16"x8"
48 1 5.7 9.9 11.5 23 17.2 19.9 39.8 1.92 124400 116300 132500 14"x16"x8"
64 2 7.6 13.3 15.3 30.7 23 26.5 53 110200 125400 117300 133500 20"x30"x8"
80 2 9.6 16.6 19.2 38.4 28.7 33.2 66.4 111200 126400 118300 134500 20"x30"x8"
96 2 11.5 19.9 23 46 34.5 39.8 79.7 112200 127400 119300 135500 20"x30"x8"




 MORE IMAGES 

·  Dimensional Drawing


 DOWNLOADS 

Cooling Tower Basin Heater Control Panel IOM
(PDF, 167KB)

Control Panel Addendum Instructions for Circuit Boards
(PDF, 73KB)

Series HX-874Z-Basin Heater Panel Replacement Parts
(PDF, 47KB)


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