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Series PS-801
for Steam Boilers
Series PS-851
for Hot Water Boilers
Probe Type Low Water Cut-Offs
Applications:
Residential and Commercial
PS-851 models can be used as secondary low water cut-offs
on steam boilers with pressures up to 15 psi
• Before using this product read and understand instructions.
• Save these instructions for future reference.
• All work must be performed by qualified personnel trained in the proper application,
installation, and maintenance of plumbing, steam, and electrical equipment and/or systems
in accordance with all applicable codes and ordinances.
• To prevent flooding, do not use manual reset models with electric automatic water feeders.
• To prevent electrical shock, turn off the electrical power before making electrical connections.
• This low water cut-off must be installed in series with all other limit and operating controls
installed on the boiler. After installation, check for proper operation of all of the limit and
operating controls, before leaving the site.
• We recommend that secondary (redundant) Low Water Cut-Off controls be installed on all
steam boilers with heat input greater than 400,000 BTU/hour or operating above 15 psi of
steam pressure. At least two controls should be connected in series with the burner control
circuit to provide safety redundancy protection should the boiler experience a low water
condition. Moreover, at each annual outage, the low water cut-offs should be dismantled,
inspected, cleaned, and checked for proper calibration and performance.
• 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.
• When using mixed voltages, remove the factory installed jumper wire between terminal (H)
and (C), or between (1) and (2) on old Model PS-801-120.
Failure to follow this warning could cause property damage, personal injury or death.
®
WARNING
!
McDonnell & Miller
Installation & Maintenance
Instructions
MM-202(N)
U.S. Pat. No. 6,571,625
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Related Manuals for ITT Series PS-801
Summary of Contents for ITT Series PS-801
- Page 1 McDonnell & Miller Installation & Maintenance Instructions MM-202(N) Series PS-801 U.S. Pat. No. 6,571,625 ® for Steam Boilers Series PS-851 for Hot Water Boilers Probe Type Low Water Cut-Offs Applications: Residential and Commercial PS-851 models can be used as secondary low water cut-offs...
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Page 2: Specifications
Temperature: Storage: -40˚F to 120˚F (-40˚C to 49˚C) Ambient: 32˚F to 120˚F (0˚C to 49˚C) Humidity: 85% (non-condensing) Series PS-801 for Steam Boilers Series PS-851 for Hot Water Boilers Preset time delays prevent nuisance burner cycling: No time delays provided... -
Page 3: Installation
INSTALLATION TOOLS NEEDED: One (1) flathead screwdriver, and one (1) pipe wrench. For Remote Installations a level and power drill will be required. STEP 1 - Locating and Installing the Probe a. Based on the following criteria locate a suitable position for the probe (A): 1/4"... -
Page 4: Direct Mounting
STEP 2 - Installing Control Box (continued) Direct Mounting b. Using a flathead screwdriver, loosen the probe mounting screws (F) 1/8" (3mm) about 1-1/2 turns and slip the control housing (G) over these two screws at a 20˚ angle. c. Rotate the control housing (G) 20˚ counter-clockwise so that the slots in the control base are firmly under the screw heads. -
Page 5: Step 4 - Control Wiring
Remote Mounted Probe c. Connect the probe (A) to the wiring circuit by: Connecting a suitable 16 AWG wire (not provided) to the threaded end (V) of the probe (A). Place the lockwasher (K) and wing nut (L) (provided) over the threaded end of the probe and tighten the wing nut to 1/2 ft•lb (.65 N•m). - Page 6 STEP 4 - Control Wiring (continued) c. Based on the Boiler’s Control Circuit voltage and the required input voltage of the LWCO, select proper wiring diagram and proceed to that page. Models with Red (low water) and Amber (test) Lights Models with Red (low water) and Green (power) Lights LWCO Model Boiler Circuit Voltage...
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Page 7: Installation Complete
PS-801/851 with 24 Volt Burner Circuit with Red (Low Water) and Amber (Test) Lights • Connect wire (A) of 120 volt circuit to terminal (1) and terminal (L1) of transformer. • Connect wire (B) of 120 volt circuit to terminal (2) and terminal (L2) of transformer. - Page 8 Page All Models with Red (Low Water) and Amber (Test) Lights Series PS-801 and PS-801-M with Red (Low Water) and Green (Power) Lights Series PS-851 and PS-851-M with Red (Low Water) and Green (Power) Lights All Models with Red (Low Water) and Amber (Test) Lights a.
- Page 9 (BB) turns "ON" the probe may be grounded. If so, replace the grounded probe. For Series PS-801 & PS-801-M with Red (Low Water) and Green (Power) Lights Start-Up a. Before filling the system, turn on the electric power to the boiler. Set the thermostat to "heat".
- Page 10 (continued) Testing Control Using "Test Button" d. Depressing test button with "water on probe" for Series PS-801 (auto reset units only): (Must depress and hold the test button to activate test cycle.) 1. When test cycle is activated the Green and Red lights will flash.
- Page 11 For Series PS-851 & PS-851-M with Red (Low Water) and Green (Power) Lights (continued) Manually Testing Control c. Slowly drain the boiler of water. For all Series PS-851 (both auto and manual reset units) 1. When water drops off the probe, the Green light will remain "ON". 2.
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Page 12: Troubleshooting
NOTE Clean probe by wiping with non-abrasive cloth and rinsing with clean water. DO NOT use sharp instruments to remove any accumulations of rust or scale. ©2007 ITT Corporation Printed in U.S.A. 11-07 246780 8200 N. Austin Ave. Morton Grove, IL 60053...
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