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8

STEP 5 - Testing

All Models with Red (Low Water) and Amber (Test) Lights

OFF

ON

a. Before filling the system,

turn on the electric power 

to the boiler. Set the room thermostat to "heat".

For Series PS-801

the burner will come on briefly 

(10 second or less) and then shut off which verifies 
proper operation. The burner 

will not

operate without 

water in the system. The low water cut-off's red LED 
should be illuminated.

For Series PS-851

the burner will come on briefly 

and then shut off, verifying proper operation. The 
burner 

will not

operate without water in the system.

The low water cut-off's red LED should be illuminated.

b.

Fill the system with water.

For Series PS-801

the low water cut-off's red LED 

should shut off in about 15 seconds, after the water  
contacts the probe.

For Series PS-851

the low water cut-off's red LED 

should shut off after the water contacts the probe.

AA

BB

G

c.

Hold the test switch (AA) down while noting the 
amber LED (BB) on top of the control housing (G).

1.

If the amber LED (BB) glows dimly,

the water 

level is above the probe.

2.

If the 

amber LED (BB) is off,

the water level may 

be below the probe or the water is too pure and 
may require the addition of boiler water treatment.

3.

If the 

amber LED (BB) glows brightly,

it could indi-

cate a grounded (non-operable) probe. If this is 
the case, proceed to "Troubleshooting".

AA

d.

Test for correct burner circuit wiring.

1.

Hold down the test switch (AA) while the burner 
is running for more than:

• 12 seconds for PS-801
• 2 seconds for PS-851

2.

If the burner shuts off while the test switch is 
depressed, the burner circuit is wired correctly.

Page

All Models with Red (Low Water) and Amber (Test) Lights

8

Series PS-801 and PS-801-M with Red (Low Water) and Green (Power) Lights

9

Series PS-851 and PS-851-M with Red (Low Water) and Green (Power) Lights

10

AA

CC

e.

For the automatic reset models -

Release the test 

switch (AA) and the burner should resume firing 
provided that the boiler water is in contact with the 
probe.

For the manual reset models -

The burner will not 

return to normal operation until the reset switch (CC) 
is set.

Содержание McDonnell & Miller GuardDog PS-801 Series

Страница 1: ...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 in...

Страница 2: ...st lights 3 000 ohm For models with red low water and green power lights 7 000 ohm Control Power Consumption For models with red low water and amber test lights 3 VA For models with red low water and...

Страница 3: ...ine suitable tapping for the probe 2 Locate probe in supply piping using a tee fitting STEP 1 Locating and Installing the Probe 3 1 4 6mm 1 4 6mm A E A F c Using a wrench tighten the probe A into the...

Страница 4: ...clockwise so that the slots in the control base are firmly under the screw heads Tighten the mounting screws F to approximately 2 ft lb 2 6 N m d Identify a desirable location to mount the control as...

Страница 5: ...l 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...

Страница 6: ...ing of 167 F 75 C if the liquid s temperature exceeds 180 F 82 C Failure to follow this warning could cause property damage personal injury or death WARNING Models with Red low water and Amber test Li...

Страница 7: ...CUIT C B D A N 120 VOLT CIRCUIT Connect Hot wire A of 120 volt circuit to terminal H Connect Neutral wire B of 120 volt circuit to terminal N Connect wire C from beginning of Burner circuit thermostat...

Страница 8: ...r LED BB on top of the control housing G 1 If the amber LED BB glows dimly the water level is above the probe 2 If the amber LED BB is off the water level may be below the probe or the water is too pu...

Страница 9: ...ntinue to flash for 15 seconds DOM and then turn OFF 4 The burner will turn ON as long as there is water on the probe Warning To prevent flooding never use a water feeder with a manual reset low water...

Страница 10: ...light will flash for 15 seconds DOB and then turn OFF 7 The burner will turn ON as long as there is water on the probe Warning To prevent flooding never use a water feeder with a manual reset low wate...

Страница 11: ...turn ON as long as there is water on the probe Testing Control Using Test Button e Depressing test button with water on probe manual reset units only Must depress and hold test button to activate test...

Страница 12: ...e adequate conductance Troubleshooting Replace Probe if Teflon insulator is cracked or worn Probe is loose Failure to follow this caution could cause property damage personal injury or death CAUTION C...

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