Xylem MM 284D User Manual

INSTRUCTION MANUAL

MM-284D

Operation

The Ser

ies PSE-800 probe type LWCO’s provide protection against low water conditions for residential and commercial steam boiler applications. The control uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded, the new PSE-800 makes a decision to shut the burner off based on the volatility/variability

SPECIFICA

utomatic reset after power outage

All models include a provision for adding an alarm or automatic water feeder.

30 second Delay on Make (DOM)

10 second Delay on Break (DOB)

Contr T

Humidity: 85% (non-condensing)

ol Unit

emperature Ratings:

emperature:

Storage: -40˚F to 135˚F (-40˚C to 57˚C)

Ambient: 32 F to 120 F (0 C to 4 C)

TIONS

of the resistance readings. This new patented technology provides the best protection possible without turning off the boiler unless a low water condition exists. As an added measure of safety, the control will turn off the boiler if it recognizes an out-of-water condition when the sensitivity threshold is exceeded.

Green

(Power On)

Red

(Low Water)

obe Specifications

Maxim Pr

HZ: 50/60

Contr

1.7VA @ 24VAC

3.6VA @ 120VAC

Electrical Enclosure Rating: NEMA 1 General Purpose

um Steam Pressure: 15 psi (1.0 kg/cm

obe Sensitivity: 7,000 ohm

Model

PSE-802-24 PSE-802-U-24 PSE-802-RX2-24 PSE-801-120 PSE-801-U-120

ol Power Consumption:

Control Voltage Motor Switch Rating

24 VAC N/A 50VA

120 VAC 7.5 FLA 43.2 LRA 125VA

)

Pilot Rating

INST

ALLATION

OOLS 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 Pr

a. Based on the f

For all Applications:

1. Refer to boiler manufacturers instructions to determine suitable tapping for the probe.

2. Make sure probe is installed above minimum safe water line as determined by the boiler manufacturer.

3. Make sure that ends and sides of the probe are at least 1/4” (6.4mm) from all internal metal surfaces.

4. sure the probe is positioned to shut off

Make the boiler before the water level falls below the lowest visible part of the gauge

b. Sparingly, apply pipe sealant to the ext

threads (D) of the (A).

ollowing criteria locate a suitable position for the probe:

glass.

ernal

probe

obe

1/4"

(6mm)

1/4"

(6mm)

Minimum Safe

Water Level

(May vary

by boiler

manufacturer)

Control

Steam

Boiler

Probe

IMPORTANT: Do not use tape. Only use

04&%

pipe sealant.

c. Using a wrench, tighten the probe (A) into the

tapped connection (E) that w

as determined in Step 1 of these instructions. Tighten to 47 ft•lb (64 N•m). NOTE: Be sure to align the probe so that the mounting scre

STEP 2 - Installing Contr

ws (F) are in a horizontal position.

ol 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.

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