Miller Electric 852 Spezifikationen

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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
CAUTION
!
WARNING
U.S. Pat. No. 6,571,625
McDonnell & Miller
Installation & Maintenance
Instructions
MM-216(J)
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Inhaltsverzeichnis

Seite 1 - MM-216(J)

Series PS-802for Steam BoilersSeries PS-852for Hot Water BoilersProbe Type Low Water Cut-OffsApplications:– For residential and commercial application

Seite 2 - INSTALLATION

10e. Depressing test button with "water on probe" for Series PS-802-M (manual reset units only):(Must depress and hold the test button for m

Seite 3 - 1/4" (6mm)

11c. 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

Seite 4 - 1 1/4"

If control fails to operate as required, perform the following diagnostic checks:1. Check to be sure that the water level in the boiler is at or above

Seite 5 - STEP 3 - Probe Wiring

Green(Power On)Red(Low Water)2SPECIFICATIONSINSTALLATIONTOOLS NEEDED:One (1) flathead screwdriver, and one (1) pipe wrench.For Remote Installations a

Seite 6 - IMPORTANT

3ADa. Based on the following criteria locate a suitable position for the probe (A):b. Sparingly, apply pipe sealant to the externalthreads (D) of the

Seite 7

4GFFb. Using a flathead screwdriver, loosen theprobe mounting screws (F) 1/8" (3mm) about1-1/2 turns and slip the control housing (G)over these t

Seite 8 - STEP 5 - Testing

5LKJAa. Slip the ring terminal lead (J) followed by thelockwasher (K) over the threaded end of theprobe (A). Tighten the wing nut (L) onto theprobe to

Seite 9

6STEP 4 - Control Wiring• To prevent electrical shock, turn off the electrical power before making electrical connections.• This low water cut-off mus

Seite 10 - Green (Power) Lights

AB7Wiring harness is provided by boiler manufacturer.NOTEDo not use force to insert plug. This may damagereceptacle solder connections.!CAUTIONNPMd. F

Seite 11 - Manually Testing Control

8STEP 5 - TestingAll Models with Red (Low Water) and Amber (Test) LightsOFFONa. Before filling the system, turn on the electric power to the boiler. S

Seite 12 - McDonnell & Miller

9b. Now fill the boiler with water.For Series PS-802 (auto reset units only)1. When water touches the probe, the Red light will start flashing for 15-

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