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Series PS-802
for Steam Boilers
Series PS-852
for Hot Water Boilers
Probe Type Low Water Cut-Offs
Applications:
– For residential and commercial applications
– For applications that require ANSI Z21.13a conformance
PS-852 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.
Failure to follow this warning could cause property damage, personal injury or death.
®
WARNING
!
McDonnell & Miller
Installation & Maintenance
Instructions
MM-216(J)
U.S. Pat. No. 6,571,625
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Summary of Contents for ITT McDonnell & Miller PS-802 Series
- Page 1 McDonnell & Miller Installation & Maintenance Instructions MM-216(J) Series PS-802 U.S. Pat. No. 6,571,625 ® for Steam Boilers Series PS-852 for Hot Water Boilers Probe Type Low Water Cut-Offs Applications: – For residential and commercial applications – For applications that require ANSI Z21.13a conformance PS-852 models can be used as secondary low water cut-offs on steam boilers with pressures up to 15 psi WARNING...
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Page 2: Specifications
SPECIFICATIONS Green Amber The Series 800 controls provide con- (Power On) (Test) (Low Water) (Low Water) tinuous protection against low water conditions for residential, commercial and industrial applications. Newer models feature increased probe sensitivity to prevent nuisance shut- downs, and a new test feature that diagnoses shorted probe problems at installation. - Page 3 STEP 1 - Locating and Installing the Probe a. Based on the following criteria locate a suitable position for the probe (A): 1/4" (6mm) For all Applications: 1. Make sure probe is installed above minimum safe water line as determined by the boiler manufacturer.
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Page 4: Step 2 - Installing Control Box
STEP 2 - Installing Control Box a. Using a flathead screwdriver, loosen the two (2) screws that secure the cover (G) to the control about 1-1/2 turns and remove cover. 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˚... -
Page 5: Step 3 - Probe Wiring
STEP 3 - Probe Wiring Direct Mounted Probe a. Slip the ring terminal lead (J) followed by the lockwasher (K) over the threaded end of the probe (A). Tighten the wing nut (L) onto the probe to approximately 1/2 ft•lb (.65 N•m). b. -
Page 6: Step 4 - Control Wiring
STEP 4 - Control Wiring WARNING • 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. -
Page 7: Installation Complete
d. For all wire connections to the terminal block (M). 1. Strip about 1/3" (8.5 mm) of insulation from the wire. 2. Loosen the terminal screw (N) but DO NOT REMOVE. Move the wire clamping plate (P) back until the plate touches the back side of the screw head. - Page 8 STEP 5 - Testing Page All Models with Red (Low Water) and Amber (Test) Lights Series PS-802 and PS-802-M with Red (Low Water) and Green (Power) Lights Series PS-852 and PS-852-M with Red (Low Water) and Green (Power) Lights All Models with Red (Low Water) and Amber (Test) Lights a.
- Page 9 For Series PS-802 & PS-802-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". For all Series PS-802 1. Upon initial power up, the Green and Red lights will flash simultaneously 4 times. 2.
- Page 10 Testing Control Using "Test Button" (continued) e. Depressing test button with "water on probe" for Series PS-802-M (manual reset units only): (Must depress and hold the test button for more than 2 seconds to activate test cycle.) 1. When test cycle is activated the Green and Red lights will flash. 2.
- Page 11 Manually Testing Control c. Slowly drain the boiler of water. For all Series PS-852 (both auto and manual reset units) 1. When water drops off the probe, the Green light will remain "ON". 2. The Red light will turn “ON” and the burner will turn “OFF”, if water is off the probe. Testing Control Using "Test Button"...
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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 246808 8200 N. Austin Ave. Morton Grove, IL 60053...
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