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
- Circuit Breaker
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
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
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
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.
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.
|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|
|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|