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
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″ |
