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Produttore : Chromalox File Size : 130.8 kb File Nome : IM-PE405.pdf Lingua di insegnamento:

3. Power controllers must be used when heaters are rated 3 phase and when the heater amperage exceeds the rating of the thermostat. 4. Refer to Wiring Diagram, Table B, for the proper wiring diagram for connecting heater. Model 240V, 1 O Fig. 240V, 3 O . Fig. 480V, 1 O . Fig. 480V, 3 O . Fig. NWH-3625 NWH-3925 NWH-31225 NWH-31525 NWH-31825 2 2 2 2 2 1 1 1 1 1 2 2 2 2 2 1 1 1 1 1 Figure 1 240V, 480V 3O. Figure 2 240V, 480V, 1O Use contactor when the heater amperage exceeds the rating of the thermostat. Note: Dotted lines indicate “customer furnished.” However, Thermostat could have been furnished by Chromalox if so specified on the order. OPERATION 1. Do not heat solutions that are corrosive to the heating element any electric circulation heater against failure by sheath or the heating chamber. sheath corrosion if such failure is the result of operating conditions beyond our control. WARNING: Type NWH Circulation Heaters are 2. Terminal ends of heater must be protected from drippings, equipped with copper heating elements and galva condensation, spray or direct spill-over of material. Their nized-steel heating chambers. It is the responsibil presence at the terminals may damage heater electrical insula ity of the user to know the chemical composition tion. Liquid-tight terminal enclosures are available to protect of the corrosive solution and the character of the heater. Contact your Local Chromalox Sales office. materials entering the solution as well as the cor 3. If foreign material is carried by the liquid flow, install suitable rosive effect of the solution upon the heating ele filters in the inlet pipe line to the heater. ments and chamber. Chromalox cannot warrant 4. Do not allow heater to operate when liquid flow is interrupted. MAINTENANCE 1. WARNING: Hazard of Electric Shock. Disconnect all 3. Periodically check temperature control and limit control operpower before servicing heater. ation to insure accurate and safe process operation. 2. Remove heating element assembly periodically to check 4. Check all electrical connections periodically and retighten heater sheath for scaling, corrosion or excessive oxidation. connections which may have loosened in service. Replace wire Correct operating conditions to minimize sheath deterioration. and wire terminals which show signs of oxidation which would interfere with establishment of reliable electrical connections. RENEWAL PARTS IDENTIFICATION Model Volts Phase kW Heating Elements AR2525 Thermostat Assembly MF7 Thermostat Assembly NWH-3625 240 1 6 155-024796-001 300-057560-007 300-048481-006 NWH-3625 240 3. 6 155-024796-002 300-057560-007 300-048481-006 NWH-3625 480 1 6 155-024796-003 300-057560-007 300-048481-006 NWH-3625 480 3. 6 155-024796-004 300-057560-007 300-048481-006 NWH-3925 240 1 9 155-024796-006 300-057560-007 300-048481-006 NWH-3925 240 3. 9 155-024796-007 300-057560-007 300-048481-006 NWH-3925 480 1 9 155-024796-008 300-057560-007 300-048481-006 NWH-3925 480 3. 9 155-024796-009 30...

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