Chromalox PQ404-6 specifications Wiring cont’d

Page 4

WIRING (cont’d.)

Figure 8 – Typical Wiring Diagram

 

Power Circuit

 

Terminal Block

To

To Other

Power

Heater

Curcuit

Groups

Relay

 

 

 

 

To

 

Step

 

Other

 

 

Heater

 

Sequencer

 

 

 

Groups

 

 

 

120 Volt Control Voltage

Electronic Resistance Sensing Amplifier for Auxiliary Low Water Cutoff

Hi Limit

Control

Typical 3 Phase Heater Group

Figure 9 – Power Circuit Detail

Low Water

Probe

Figure 10 – Auxiliary Low Water Cutoff

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Contents Installation No. of Power CircuitsPQ404-6 Control Circuit VoltageInstallation cont’d Wiring Wiring cont’d Trol Operation and Testing Reinstall contactor fusesAdjusting Operating Pressure Controls PRE-OPERATION CheckRecommended START-UP Procedures OperationManual Blowdown Instructions Automatic Blowdown Instructions if Furnished See Figures 14Typical Wiring for Automatic Blowdown System Operation cont’dThrottling Range Setting L918 Optional Equipment for Chromalox Steam BoilersProportional Pressure Control only Supplied with Sequencer CheckoutOptional Equipment for Chromalox Steam Boilers cont’d Boiler Sequencer 5 StepGeneral DetailsSolid State Progressive Sequencer See Figure MaintenanceProgressive Sequencing Renewal Parts Identification Read Completely Before Starting WorkRenewal Parts Identification cont’d
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