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Installation,Operation
4 CHS
and
(Supersedes PQ404-5) PQ404-6
RENEWAL PARTS IDENTIFICATION 161-048642-001
OCTOBER, 1983
Horizontal Electric Steam Boiler
Model Number CHS 0 – 150 PSI
Boiler Serial No . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Circuit Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model No. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No.
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INSTALLATION (cont’d.) Pressure Manual Reset Gauge Pressure Conrol E G High Pressure H I Control Safety Steam Valve (G) Outlet (F) Electric Step Sequencer Control (Optional) Box Heating A Elements 60” 30” Blow Down Water Return Drain Valve (L) Level Inlet (J) Control Wall Blow Down Wall Check Valve D Drain Valve C Water Inlet (K) (L) B Figure 1 Figure 2 Figure 3 *CHS- thru 1620 have 2 control boxes (See Figure 2). Add 13” to “B” dimension. Model Number A B C D E F* G H I J K L CHS-150 thru CHS-3
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INSTALLATION (cont’d.) SPECIAL INSTRUCTIONS FOR CUSTOMERS SUPPLYING L THEIR OWN CONDENSATE OR PUMP SYSTEMS. 1” Condensate 1. Check the voltage of the motor before making the wiring connec- 1” Vent Return tion. Some Chromalox boilers are supplied with dual voltage sys- tems. The motor should always match the voltage of the control circuit. 2. The motor circuit should be wired into the pump control as shown 1/2” in wiring diagram. Water 3. A heavy-duty vacuum breaker is required when condensate s
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WIRING (cont’d.) Figure 8 – Typical Wiring Diagram Power Circuit Terminal Block Electronic Resistance Sensing Amplifier for Auxiliary Low Water Cutoff To To Other Power Heater Curcuit Groups Relay 120 Volt Hi Limit To Control Voltage Control Other Step Heater Sequencer Groups Low Water Probe Typical 3 Phase Heater Group Figure 9 – Power Circuit Detail Figure 10 – Auxiliary Low Water Cutoff 4
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PRE-OPERATION CHECK B. ADJUSTING OPERATING PRESSURE CONTROLS Cut-Off and 1. Chromalox boilers are supplied with operating and high limit pres- Pump Alarm Switch sure controls. One is used for controlling the operating pressure of Low Water the boiler while the other is used as a high limit control. To deter- Cut-Off Terminals mine the difference in the controls, the high limit has a manual Adjusting reset lever on top of the case. Also, there is no differential scale Alarm Screws present. Circui
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OPERATION RECOMMENDED START-UP PROCEDURES 1. Close globe valve on outlet side of boiler. (Customer Supplied) 2. Turn on boiler and allow pressure to build up to operating pressure. 3. Only open globe valve by quarter turns at first, introducing small- er amounts of steam into process. Avoid opening globe valve all at once. This will eliminate the possibility of evacuating the boiler of water caused by the suddenly increased boiling of the water in the vessel as the pressure is reduced. On boiler
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OPERATION (cont’d.) Now turn the wheel on the large timer until the “off” tab passes the Set the tabs on the large timer for the ON and OFF times desired “time now” arrow. The “boiler normal” light should go out and the for the boiler, screw in the small black day-skip tabs if the boiler is to valve should begin to open. Once the “valve open” light goes on, the remain off for the weekend, etc. valve should remain open for a few seconds and then automatically If the boiler is on 24-hour duty set
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OPTIONAL EQUIPMENT FOR CHROMALOX STEAM BOILERS AUXILIARY LOW WATER CUT-OFF “min” to “F”. The value of each division varies with the scale range of (See page 4 for Wiring Diagram) the instrument. Operation Operation of this control is accomplished by sensing a minute AC Pressure Value Each current flowing between submerged contact probe in the boiler shell. Scale Rating Division on Scale 0-15 psi 2.2 psi When this minute AC current is conducted through an external cir- 5-150 psi 3.6 psi cuit resi
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OPTIONAL EQUIPMENT FOR CHROMALOX STEAM BOILERS (cont’d.) 5. Connect the ohmmeter between controller terminals W and R and TESTING OPERATION OF SEQUENCER (See Figure 20) raise the set point of the controller above the actual pressure being 1. With boiler off, remove wiring from pressure control on sequencer measured. The ohmmeter should read the full value of the poten- low voltage terminal board. tiometer measured in step 4 (135 ohms for an L91B). 2. Turn on boiler to supply the voltage to seque
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OPTIONAL EQUIPMENT FOR CHROMALOX STEAM BOILERS (cont’d.) The Sequence Reverser accomplishes its tasks and shows the rela- Solid State Progressive Sequencer (See Figure 22) tive use of each of ten beat stages during the first four days of the The solid state progressive sequencer provides accurate electronic cycle. This is how the work load would be distributed on a boiler with- control of multi-stage loads of the type used in Chromalox steam boil- out Sequence Reverser. It can be seen the early
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MAINTENANCE INSTRUCTIONS FOR ELEMENT REPLACEMENT 2. On automatic feed units, close valve on incoming water line. Drain CAUTION: Before installing your new elements, be sure the boiler completely of water. McDonnell-Miller low-water cut-off is operating perfectly and the 3. Open boiler door to expose heating element. float chamber and lower equalizer column are completely clear of 4. Disconnect wire (electric) leads connecting element to main power sludge or other foreign matter. (See Figure 23)
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RENEWAL PARTS IDENTIFICATION (cont’d.) AUTOMATIC FEED PUMP CONTROLLER Bellows Base Clamp Assembly 2 Wire Junction Panel Switch 3 Wire Switch Bellows Assembly with Gasket Bellows Base Clamp and Bellows Assembly Low Water Cutoff and Water Feed Controls Description Part Number Sylphon Bellow Complete Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300-118538-013 Assembly Complete Assembly (Manual Reset) . . . . . . . . . . . . . . . . . . . . . . . . 300-118538-02
