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SPX Cooling Technologies 92-1322C manual

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Table of contents for the manual

  • Page 1

    / Mar le y Electr ic Basin Heat er / User Manual 92-1322C[...]

  • Page 2

    [...]

  • Page 3

    3 / Receiving and Inspection / The heater package is shipped directly fr om the vendor . 1. Check all parts for any damage in transit. The carrier is responsible for the condition of the heater package upon arrival. If damage is appar - ent, note the fr eight bill accordingly . This will support your claim with the freight carrier . 2. Check the na[...]

  • Page 4

    4 / Intr oduction / The purpose of a basin heater is to prevent water freezing in the cooling tower basin during periods of shutdown or standby operation. The heater system is sized according to tower model and location to give maximum protection against water freezing in the cold water basin. This heating system is not intended to protect the towe[...]

  • Page 5

    5 / Installation / For detailed information concerning installation, refer to the heater installation drawing provided with the cooling tower . Heater Element Install the heater element(s) in the depr essed area of the cold water basin near the outlet. Provide clearance of 7 ⁄ 8 " or more above the floor . A single centrally located heater [...]

  • Page 6

    6 / Installation / Control Panel The contr ol panel is suitable for outdoor mounting, and may be mounted on the tower , but not inside the tower . Wir e the heaters to the panel. Wir e the panel to the branch circuit supplying power to the heater . The field supplied branch cir cuit disconnect switch and the branch cir cuit protective device (fusi[...]

  • Page 7

    7 / Installation / T emperature / W ater Level Sensor Assembly This basin heater package is equipped with a combination tempera- ture/liquid level sensor and may have a thermal cutoff switch. Both are safety devices that must not be altered or changed in any man- ner . Disabling either safety feature may result in combustion and/ or fire, which co[...]

  • Page 8

    8 / Oper ation / SOLID S TA TE RELA Y CARD PROBE BASIN RED CT N G2 G1 T2 T1 SH 120 RED 240 24 COM NC NO BLK RED BLK SHIELD LED INDICA TORS GREEN Figure 1 T able 3 Red Green OFF OFF Ready , No Demand ON OFF Low W ater Level OFF ON Heater On Operating Instructions T o operate the heater system, visually check that the water level is above the sensor [...]

  • Page 9

    9 T esting above Freezing T emperatures Under normal operating conditions the heaters will be turned on at a water temperatur e between 40° and 45°F , and tur ned of f when the water temperature exceeds 45°F . For testing the system at temperatures above 45°F there ar e two methods as follows: Method A 1. Disconnect power to the control panel u[...]

  • Page 10

    10 Method B 1. Disconnect power to the heater contr ol panel using standard lockout procedur es for safety . 2. Drain basin until the water level is below the probe allowing r emoval of the probe. Make sur e water still covers the heater elements. 3. Place the pr obe in a container of ice water making sure both metal parts of the probe ar e submerg[...]

  • Page 11

    11 SOLID S TA TE RELA Y CARD PROBE BASIN RED CT N G2 G1 T2 T1 SH 120 RED 240 24 COM NC NO BLK RED BLK SHIELD JUMPER GREEN Figure 3 Caution Deicing If the temperature/water level sensor assembly becomes encased in ice the heaters will not operate. Ice provides inadequate conductivity for the sensor pr obe to detect operational water level. T o opera[...]

  • Page 12

    12 / T r oubleshooting / Please refer to the Caution statement on Page 6 and the Warning statement on Page 7 of this manual before performing the following T roubleshooting procedures. If the system fails to operate, check the following: 1. Check water temperature. Systems will turn on between 40° and 45°F and turn off above 45°F . 2. Check wate[...]

  • Page 13

    13 2. If the contactor does not operate, check voltage across terminal N on the cir cuit board and NO on the r elay mounted on the circuit board —21-29 volt requir ed. If voltage is present across the coil—N to NO— the contactor coil is defective and the contactor must be replaced. If voltage is not present, the circuit board relay is defecti[...]

  • Page 14

    14 1 T ransformer 120V/24V .............................................. B52465D T ransformer 208V/24V .............................................. A79270D T ransformer 240V/24V .............................................. B91566D T ransformer 480V/24V .............................................. B09608D T ransformer 600V/24V ...............[...]

  • Page 15

    [...]

  • Page 16

    7401 WEST 129 STREET | OVERLAND PARK, KANSAS 66213 UNITED STATES | 913 664 7400 | spxcooling@spx.com | spxcooling.com In the interest of technological progress, all products are subject to design and/or material change without notice. ©2008 SPX Cooling Technologies, Inc. | Printed in USA Manual 92-1322C[...]