Zodiac Legacy LRZ Specifications download pdf (Page 34)

 

Legacy™ Model LRZM Pool/Spa Heater

Installation and Operation Manual

 

Since the limit switches are not easily accessible,

you can check the voltage going into the component

after the limit switches in the circuit. If voltage is

detected there, then the limit switches are closed and

are operational.

Check the voltage going to the water pressure

switch. Leave the red voltmeter lead in place at test

point 1. Touch the black lead of the meter to the termi-

nal of the water pressure switch where the black wire

is connected (test point 13).

If the voltage is less than 220mV, there may be

a bad connection, a partial short or a faulty sensor. If

there is no voltage, one of the limit switches is open.

This is normally due to excessive water tempera-

ture, which should be thoroughly investigated before

replacement of limit switches. Excessive water temper-

ature may be caused by low water ow. Water ow

deciency may be due to obvious problems such as a

defective pump or blocked water lter. Alternatively,

excessive water temperature may be due to over-ring,

or to a problem with the water piping or the heater's

internal bypass control. Over-ring might be a result

of an incorrect gas orice or supply of propane gas to a

heater intended for natural gas.

If there are no such fundamental problems,

identify which of the switches is open. Limit switch

access is through the limit switch plugs on the inlet/

outlet header. Remove the limit switch plugs from

the bottom of the header and gently remove the limit

switches from the wells. Move the black lead of the

meter to the terminal on the 42°C (108°F) limit switch

(test point 9) that is connected to the reman switch

terminal block. Less than 220mV at this point means

that the wire between the terminal block and the limit

switch has a poor or broken connection or a partial

short. Replace the wire assembly. If at least 220mV is

detected at test point 9, then move the black lead of the

meter to the other terminal of the 42°C (108°F) limit

switch (test point 10). Low or no voltage here means

that the limit is open and must be replaced.

If 220mV or more is detected at test point 10,

move the black lead of the meter to the terminal on

the 52°C (126°F) limit switch (test point 11) that is

connected to the 42°C (108°F) limit switch. Less than

220mV at this point means that the wire between the

two limit switches has a poor or broken connection

or a partial short. Replace the wire assembly. If at

least 220mV is detected at test point 11, then move

the black lead of the meter to the other terminal of the

52°C (126°F) limit switch (test point 12). Low or no

voltage here means that the limit switch is open and

must be replaced. If voltage is detected at test point 12,

move the black lead of the meter to the terminal of the

water pressure switch where the black wire from the

high limits is connected (test point 13).

Less than 220mV at this point indicates that the

wire connecting the high limits to the water pressure

switch is faulty or poorly connected. Correct the

problem or replace the wire.

 The limit switches have different trip points,

and it is important that replacements are

correct. The 42°C (108°F) switch has a red

dot on the top of the switch, and must be

installed in the inlet side of the header. The

52°C (126°F) switch has no dot and must be

installed in the outlet side of the header in the

well farthest from the heater jacket.

 

If the meter shows at least a 220mV signal at test

point 11, move the black lead of the meter to the other

terminal on the water pressure switch (test point 14).

If there is no voltage, the pressure switch contacts

are open. This is almost always due to a water ow

deciency, the most common one being a blocked water

lter or defective pump. However, sometimes it is due

to blockage of the copper tube or mis-adjustment of

the switch. Investigate thoroughly, referring to Section

11.5 “Adjusting the Water Pressure Switch”. If there

is no problem with the pool system or pressure switch

adjustment, replace the pressure switch.

 

The temperature control circuit consists of two

(2) major components which must all be working

correctly for the signal to be transmitted to the gas

valve. The components are the ON/OFF toggle switch

and the mechanical thermostat. Use the following

procedure to check each component for functionality.

Check the temperature control as a complete

circuit before checking each component individually.

With the red lead of the meter still at test point 1, place

the black lead of the meter on the back of the mechani-

cal thermostat (test point 16). If the meter shows more

than 220mV at the pressure switch (test point 14) but

not at test point 16, then one of the components of the

temperature control circuit is faulty. Proceed with the

following sections to test the components.

 

Remove the temperature control panel from the

bezel on the front of the heater to gain access to the

switch. Be sure that the toggle switch is in the "ON"

position. Place the black lead of the meter on the

toggle switch terminal (test point 15) that is connected

to the pressure switch. Less than 220mV at this point

indicates that there is a problem with the black wire

that connects the pressure switch to the toggle switch.

If at least 220mV is detected at test point 15, move the

black meter lead to the other terminal on the toggle

switch (test point 16).

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Zodiac Legacy LRZ Specifications Page 34

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