Safgard 400 Low Water Cut-Off, EL1214, EL1214-P, EL1214-R, EL-1220 Probe, VXT Water Feeder Instructions
Below you will find brief information for Low Water Cut-Off 400 Series, Probe EL1214, Probe EL1214-P, Probe EL1214-R, Probe EL-1220, Water Feeder VXT. This document presents instructions for installing and operating the low water cut-off for steam boilers. It also provides instructions for installing and operating the probes and water feeders. These instructions are essential for safe and proper operation of your boiler.
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Low maintenance. No moving parts to wear stick or hang up, as in float devices. Solid state circuitry. Designed for the highest level of performance and reliability. Automatically shuts off burner, after delay, in a low water condition to prevent dry firing. Time delay allows water to feed above the probe to a safe operating level. 400 Series Low Water Cut-Offs For Steam Boilers 24 VAC Operating Voltage Max. Pressure 15 psi HOW TO INSTALL 1 2 3 SAFE WATER LINE WARNING – To prevent electrical shock or equipment damage, power must be off during installation or servicing of the control. To prevent serious burns, the boiler should be thoroughly cooled before installing or servicing control. Only qualified personnel may install or service the control in accordance with local codes and ordinances. Read instructions completely before proceeding. The probe may be installed in the boiler above the lowest safe water level established by the boiler manufacturer. Most manufacturers provide a suitable opening in the side of the boiler. 1/4" Allow 1/4" clearance from the probe to any boiler surface, tube or baffle. NOTE: Excessive use of Teflon tape to seal probe piping threads may insulate the control from boiler ground. This could result in the control not operating. 4 REMOTE MOUNTED MODELS ONLY A B Loosen the two control cover binding head screws and remove the cover. Assemble the chassis to the probe flange and secure with the screws provided with the probe. 5 A. To secure mounting plate to boiler jacket,* pre-drill two 3/32" pilot holes using the mounting plate as a template. Secure plate with sheet metal screws provided. Attach control to mounting plate by slipping keyholes in back of chassis over pre-mounted screws on plate. Tighten screws. B. Using a wire nut, attach a wire (min 90°C) to the pigtail lead in the control box. Attach the other end to the probe terminal in the remote probe housing. Attach a second wire between the ground screw on the control chassis and one of the four screws in the remote probe housing. Note: Wires and wire nuts not provided. *Or other suitable surface P.O. Box 1847 New Haven, CT 06508 Phone: (203) 776-0473 FAX: (203) 773-1019 Connect the ring terminal wire lead to the probe terminal stud and secure with the lock washer and wing nut provided. With the power removed, proceed with installation and wiring according to the instructions on page 2. Upon completion of wiring replace control cover. WIRING METHOD A: SAME POWER SOURCE FOR CONTROL AND BURNER CIRCUIT. P1 A 2 1 P1 P2 HOT 2 1 P1 P2 A A BURNER POWER SOURCE 24VAC BURNER POWER SOURCE 24VAC FACTORY INSTALLED JUMPER LIMIT CONTROLS LIMIT CONTROLS COMMON BURNER CIRCUIT 0 COMMON P2 HOT BURNER CIRCUIT + 1 0 BURNER POWER SOURCE 24VAC A3 A2 2 + A1 WATER FEEDER A1 Connect input voltage (24 VAC, 60 HZ) to terminals 1 and 2. 24 VAC, 60 HZ must be supplied to terminals 1 and 2 for internal operation of the control. A2 Connect terminal 2 to burner circuit common. Connect terminal P2 to burner Circuit in series with other limit controls. Consult boiler manufacturer instructions for proper terminal connections. Control should be wired in series with and before other limit controls. A3 Optional water feeder connection. Connect feeder N to terminal 2. Connect Feeder H to terminal 1. Connect feeder “FEED” or “W” to terminal A. For water feeders with 2 leads, connect feeder common to terminal 2 and feeder hot to terminal A. Note: Use of a solenoid valve or McDonnell & Miller Model 101A water feeder may cause flooding and is not recommended for use with this low water cut-off. WIRING METHOD B: SEPARATE POWER SOURCE FOR CONTROL AND BURNER CIRCUIT. B1 䊴 B1 Remove jumper between terminals 1 2 1 P1 P2 A 䊳 Connect hot lead from the burner control circuit to terminal P1. This terminal supplies power to terminal P2 in normal operating conditions when water is at the probe. Connect common to burner circuit. Note: Consult boiler manufacturer instructions for proper terminal connections. B2 24VAC REMOVE JUMPER B3 2 1 P1 P2 B2 2 1 P1 P2 A P2 A and P1. Connect input voltage (24 VAC, 60 HZ) to terminals 1 and 2. 24 VAC 60 HZ must be supplied to terminals 1 and 2 for internal operation of the control. 䊴 B3 Connect terminal P2 to burner circuit in A 24VAC BURNER POWER SOURCE HOT BURNER CIRCUIT COMMON B4 2 1 P1 series with and before other limit controls. 䊳 Optional water feeder connection. Connect feeder H to terminal 1. Connect feeder “FEED” or “W” to terminal A. Connect terminal N to common of the burner circuit supply. For feeders with two leads, connect feeder hot to terminal A and connect feeder common to common of the burner circuit supply. Note: Use of solenoid valve or McDonnell & Miller model 101A water feeder may cause flooding and is not recommended for use with this low water cut-off. B4 + BURNER POWER SOURCE 0 BURNER COMMON CIRCUIT LIMIT CONTROLS HOT BURNER POWER SOURCE COMMON BURNER CIRCUIT 0 HOT 24VAC + 24VAC LIMIT CONTROLS WATER FEEDER WIRING METHOD C: PLUG CONNECTOR. C1 2 1 P1 P2 䊴 C1 Plug wire harness connector into matching end on circuit board. A IMPORTANT: Factory installed jumper must be in place between terminals 1 and P1. P2 2 1 C2 2 1 P1 P2 WATER FEEDER A 䊴 C2 Optional water feeder connection. Connect feeder N to terminal 2. Connect Feeder H to terminal 1. Connect feeder “FEED” or “W” to terminal A. For water feeders with 2 leads, connect feeder common to terminal 2 and feeder hot to terminal A. Note: Use of a solenoid valve or McDonnell & Miller Model 101A water feeder may cause flooding and is not recommended for use with this low water cut-off. Principle of Operation Hydrolevel controls are electrically operated. A probe is installed in the boiler shell and connected to the control unit. Water is used as a conductor to complete a circuit from the probe to the control unit. The control unit provides switching contacts to complete the burner control circuit and to operate an optional alarm or water feeder. NORMAL OPERATION LOW WATER CONDITION CYCLEGARD LOW-WATER CUT-OFF P1 P 2 POWER BURNER With water present at the probe, the control circuit is complete. Contact between terminals P1 and P2 completes the burner circuit, allowing for normal operation of the burner. CYCLEGARD LOW-WATER CUT-OFF P1 P 2 POWER BURNER Whenever the water falls below the probe, a time delay is activated in the control. After 15 seconds of a low water condition, the control interrupts the burner circuit and shuts down the boiler. This time delay feature prevents short cycling of the burner circuit during temporary low water levels common in turbulent steam boiler environments. Operating Instructions NOTE For proper low water cut-off operation, the boiler should be cleaned at initial installation and periodically thereafter. Refer to the boiler manufacturer’s instructions for cleaning procedures. OPERATING TEST PROCEDURE 1. After installation, bring the boiler water to a safe operating level, turn on power and set the thermostat to call for heat. The amber LED lamp should be off. The boiler will fire after a 30 second delay. 2. Slowly lower the boiler water to a point below the probe. The amber LED lamp on the control will light. The lamp may begin to flicker with the bouncing water level. Stop draining the boiler when the lamp glows steadily. NOTE: The water should not be lowered beyond a visible point in the gauge glass. 3. The boiler will shut down within 15 seconds. 2. Check the probe installation to insure that there is 1/4" clearance from any surface within the boiler or pipe. (Refer to Step 3 on page 1 of this instruction sheet. 3. Clean the boiler in accordance to the manufacturer’s instructions. Machining oils, grease, rust and other contaminants in the boiler water can cause foaming or surging and make a low water condition difficult to detect during burner operation. IF THE AMBER LED LAMP IS ON The amber LED lamp indicates that the water is below the probe. If the gauge glass shows that the water is at the correct operating level and the amber LED is lit check the following: 1. Check for plugged gauge glass. 2. Make sure probe lead wire is properly secured to the terminal. IF BURNER DOES NOT SHUT DOWN IN LOW WATER 3. Check for proper ground between probe and boiler shell. Excessive use of Teflon tape or sealing compound may isolate the probe from the boiler shell. 1. Check terminal block wiring to insure that all connections are correct. 4. Remove probe and examine for oily residue. Clean probe with steel wool and skim boiler. Maintenance To ensure optimum performance remove and inspect probe annually. Clean any sediment or scale from the probe using a scouring pad or steel wool. Re-install the probe and perform the Operating Test Procedure described above. VXT WATER FEEDER The Safgard VXT water feeder (available separately) is fully programmable to accommodate any steam system. By simply arranging a series of rocker switches the delay time before feed can be adjusted to allow condensate to return to the boiler. Settings from 30 seconds to ten min- utes are available. The amount of feed can also be set from one to five gallons. If necessary, a second delay/feed cycle is permitted. If the low water condition still exists after the second cycle the control will lock-out to prevent flooding of the system. PROBES Test Pressure: 1000 PSI, All Models 1" 17/8" 15 /16" 1" 2" SQUARE 5/16" 3/4" 111/16" 17/8" 2" SQUARE 5/16" 3/4" NPT 313/16" NPT 49/16" EL1214 – STANDARD MODEL – 3/4" NPT For 1/2”, order Model No. EL-1220 EL1214-P – 3/4" NPT EL1214-R REMOTE PROBE THE PROBE MAKES THE DIFFERENCE The probe used in all Hydrolevel controls offers you distinctive advantages. Unlike float devices, there are no moving parts to wear stick, or “hang-up” the in harsh boiler environment . A stuck or “hung-up” float can cause dangerous low water conditions. And if suddenly released, a float can feed cold water into overheated tubes or plates and cause explosive results. 1 5/8 1 5/8 5 9/16 1 5/8 2 25/32 1.00 1 1/8 2 3/8 TOP 1 1/8 3 7/8 5 1/2 BACK 2 3/8 BOTTOM LIMITED MANUFACTURER’S WARRANTY We warrant products manufactured by Hydrolevel Company to be free from defects in material and workmanship for a period of two years from the date of manufacture or one year from the date of installation, whichever occurs first. In the event of any claim under this warranty or otherwise with respect to our products which is made within such period, we will, at our option, repair or replace such products or refund the purchase price paid to us by you for such products. In no event shall Hydrolevel Company be liable for any other loss or damage, whether direct, indirect, incidental or consequential. This warranty is your EXCLUSIVE remedy and shall be IN PLACE OF any other warranty or guarantee, express or implied, including, without limitation, any warranty of MERCHANTABILITY or fitness for a particular purpose. This warranty may not be assigned or transferred and any unauthorized transfer or assignment thereof shall be void and of no force or effect. The Hydrolevel control has no float bowl so sediment cannot collect. The reliable solid state circuitry and low maintenance probe are designed to provide years of troublefree operation. MAXIMUM PRESSURE: INPUT VOLTAGE: SWITCH CONTACTS: SWITCH RATINGS AND ALARM CIRCUIT: 15 PSI 24 VAC, 60 HZ SPDT 50 VA @ 24 VAC Pilot Duty
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Key Features
- Low maintenance
- Solid state circuitry
- Automatically shuts off burner
- Time delay
- Remote mounted models
- Programmable water feeder
- Reliable solid state circuitry
Frequently Answers and Questions
What is the operating voltage of the low water cut-off?
The operating voltage is 24 VAC.
What is the maximum pressure of the low water cut-off?
The maximum pressure is 15 PSI.
How do I test the low water cut-off?
After installation, bring the boiler water to a safe operating level, turn on power and set the thermostat to call for heat. The amber LED lamp should be off. The boiler will fire after a 30 second delay. Slowly lower the boiler water to a point below the probe. The amber LED lamp on the control will light. The lamp may begin to flicker with the bouncing water level. Stop draining the boiler when the lamp glows steadily. NOTE: The water should not be lowered beyond a visible point in the gauge glass. The boiler will shut down within 15 seconds.
How do I maintain the low water cut-off?
To ensure optimum performance, remove and inspect probe annually. Clean any sediment or scale from the probe using a scouring pad or steel wool. Re-install the probe and perform the Operating Test Procedure described above.