Installation, Operation, and Maintenance Manual PSE-800-M Low Water Cut-off
Table of Contents Table of Contents Introduction and Safety.........................................................................................................................2 Introduction..........................................................................................................................................2 Safety.....................................................................................................................................................
Introduction and Safety Introduction and Safety Introduction Purpose of this manual The purpose of this manual is to provide necessary information for: • Installation • Operation • Maintenance CAUTION: Read this manual carefully before installing and using the product. Improper use of the product can cause personal injury and damage to property, and may void the warranty. NOTICE: Save this manual for future reference, and keep it readily available at the location of the unit.
Introduction and Safety Hazard levels Hazard level NOTICE: Indication DANGER: A hazardous situation which, if not avoided, will result in death or serious injury WARNING: A hazardous situation which, if not avoided, could result in death or serious injury CAUTION: A hazardous situation which, if not avoided, could result in minor or moderate injury • A potential situation which, if not avoided, could result in undesirable conditions • A practice not related to personal injury Hazard categories Haz
Introduction and Safety • • • • • • Protective shoes Protective gloves Gas mask Hearing protection First-aid kit Safety devices NOTICE: Never operate a unit unless safety devices are installed. Also see specific information about safety devices in other chapters of this manual. Electrical connections Electrical connections must be made by certified electricians in compliance with all international, national, state, and local regulations.
Product Description Product Description General description Description The probe is a manual reset low water cut-off control. The control unit has a red LED light to alert personnel to a low water condition and a green LED to indicate normal operation. Lockout delay When a low water condition occurs, the burner turns off and the red LED begins to blink. When the water level is not restored to a level above the probe within 60 seconds, the control locks out.
Product Description Humidity 85% non-condensing Probe specifications Maximum steam pressure: 15 psi (1.0 kg/cm2 Probe dimensions in inches (mm) 3/4 NPT 1.31 (33) 1.56 (40) 2.13 (54) Figure 2: Standard probe 3/4 NPT 1.31 (33) 3.06 (78) 1.56 (40) Figure 3: “U” probe Electrical specifications Ratings Model Control Voltage Motor Switch rating Pilot rating PSE-802–M-24 24 VAC N/A 50 VA 120 VAC 7.5 FLA PSE-802–M-U-24 PSE-801–M-120 43.
Installation Installation Determine location for the probe installation DANGER: Electrical hazard sufficient to kill. Always disconnect and lock out the power before you service the unit. NOTICE: • Low water cut-off must be installed in series with all other limit and operating controls on the boiler. Check for proper operation of all of the limit and operating controls before leaving the site.
Installation 4 3 1 Install the control housing 1. Loosen the screws that secure the cover (5) to the control housing about 1–1/2 turns. Remove cover. 5 2. Loosen the probe mounting screws (4) 1–1/2 turns or 1/8” (3 mm). 3. Slip the control housing (6) over the two screws at a 20° angle. 4. Rotate the control housing (6) 20° counter-clockwise so that the slots in the control base are under the screws heads. 5. Tighten the mounting screws to approximately 2 ft·lbs. (2.
Installation 10 11 1 Control to boiler wiring Warning: • Fire hazard. Electrical wiring must have a rating of 167ºF (75ºC) if the liquid exceeds 180ºF (82ºC). • When installing jumper wire make sure you are not introducing a second voltage source into the burner circuit and thereby bypassing other safety, limit, and operating controls. Select a wiring method after reviewing the wiring diagrams and notes. • Voltage of new manual reset LWCO must be the same as the existing automatic reset LWCO.
Installation 2 3 1 Option A wiring Voltage of the new manual reset LWCO is the same as the existing auto reset LWCO 1. Remove existing wire from terminal B of existing Auto Reset LWCO and connect to terminal B of new Manual Reset LWCO. 2. Connect new wire from terminal B of existing Auto Reset LWCO to terminal H of new Manual Reset LWCO. 3. Connect new wire from terminal N of existing Auto Reset LWCO to terminal N of new Manual Reset LWCO.
Installation Existing wiring to boiler New wiring to boiler N H C W B 1 (L1) 2 (L1) 3 3 N H 120 VAC N H 120 VAC (L1) 2 (L1) 1. Factory jumper bar 2. Boiler connections 3. Service switch _ _ _ _ Dashed lines indicate existing wires. _____ Solid lines indicate new wires. Option C wiring Wiring a new manual reset LWCO to a boiler with a Model 67 LWCO. Voltage of the new manual reset LWCO must be the same voltage as the burner circuit. 1.
Installation Existing wiring to boiler New wiring to boiler N H C W B 1 3 2 1 3 TOP 2 4 4 3 2 1 3 TOP 2 4 4 1. Factory jumper bar 2. To burner 3. Neutral 4. Hot _ _ _ _ Dashed lines indicate existing wires. _____ Solid lines indicate new wires.
Commissioning, Startup, Operation, and Shutdown Commissioning, Startup, Operation, and Shutdown Start up the boiler 1. Before filling the system, turn on the electric power to the boiler. a) Upon initial power up, the green and red lights will flash simultaneously four times. b) The green light will turn on and the red light will begin to flash. c) After 60 seconds, the red light will stop flashing and will remain on. d) The burner will never turn on as long as there is no water on the probe. 2.
Maintenance Maintenance Maintenance schedule Warning: • Maintenance and service must be performed by skilled and qualified personnel only. • Replace probe when PFA insulator is cracked or worn or probe is loose. • Test the low water cut-off annually. • Remove and inspect the self-cleaning probe every five years. • Use a non-abrasive cloth and rinse with clean water when the probe requires cleaning. Do not use sharp instruments to remove accumulations of rust or scale. • Replace probe every ten years.
Troubleshooting Troubleshooting Probe fails to operate Perform the following diagnostic checks if the probe fails to operate as required: 1. Check that the water level in the boiler is at or above the level of the probe. 2. Recheck all wiring to ensure proper connections as specified in the wiring diagrams of the boiler manufacturer or in this instruction manual. 3. Check to ensure that PTFE tape has not been used on the threaded connection of the electrode to the boiler. 4.
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