Raypak 155C installation instructions Electrical Solid State Thermostat Iid

ELECTRICAL (SOLID STATE THERMOSTAT IID)

If the pool/spa/hot tub water is too cold, troubleshoot the system as follows:

Check voltage at 24 V terminals.

VOLTAGE BETWEEN 21.5-28.5 V.	VOLTAGE OUTSIDE RANGE 21.5-28.5 V.
Set control to max. temperature. After 2-3	Check transformer, 120 V supply, correct as
cycles, check water temperature.	necessary
TEMPERATURE BELOW 105°F	TEMPERATURE 105-106° F.
Disconnect sensor leads from circuit board.	Control ok.
Measure sensor resistance with ohmmeter.
RESISTANCE 1-14k OHMS.	RESISTANCE O OHMS (SHORT CIRCUIT)
Check water temperature; estimate expected sensor	Check system for shorted wires or open circuits.
resistance from chart below.	Replace sensor if necessary.
MEASURED AND ESTIMATED RESISTANCE	MEASURED AND ESTIMATED RESISTANCE
MATCH WITHIN 20 PERCENT.	DON'T MATCH.
Disconnect potentiometer leads from circuit board.	Replace sensor. Reconnect all leads and check
Measure resistance with ohmmeter. If resistance is:	out system.
0-100 ohms at minimum setting;
9k to 11k at maximum setting,
replace circuit board.
Above 11k ohms but less than
15 k ohms, , replace potentiometer.
bove 15k ohms, fix loose or broken wires;
replace potentiometer if necessary.
Reconnect all leads and check out system.

If the pool/spa/hot tub water is too hot, troubleshoot the system as follows:

Check voltage at 24 V terminals.

VOLTAGE BETWEEN 21.5-28.5 V.

VOLTAGE OUTSIDE RANGE 21.5-28.5 V.

Set control to max. temperature. After 2-3

Check transformer, 120 V supply, correct as

cycles, check water temperature.

necessary.

TEMPERATURE ABOVE 108°F

TEMPERATURE 105-106° F.

Disconnect sensor leads from circuit board.

Control ok.

Measure sensor resistance with ohmmeter.

RESISTANCE 1-14k OHMS.

RESISTANCE ABOVE 15k OHMS (OPEN

Check water temperature; estimate expected

CIRCUIT) OR SHORT CIRCUIT.

sensor resistance from chart below.

Fix loose or broken wires. Replace sensor if

necessary.

MEASURED AND ESTIMATED RESISTANCE

MEASURED AND ESTIMATED RESISTANCE

MATCH WITHIN 20 PERCENT.

DON'T MATCH.

Disconnect potentiometer leads from circuit board.

Replace sensor. Reconnect all leads and check

Measure resistance with ohmmeter. If resistance

out system.

is:

0-100 ohms at minimum setting:

9k to 11k at maximum setting,

replace circuit board.

Above 11k ohms, replace

potentiometer.

0 ohms (short circuit), replace

potentiometer.

Reconnect all leads and check out system.

SENSOR RESISTANCE AT VARIOUS TEMPERATURES

Temperature

(deg. F)

61

68

70

77

86

88

95

104

106

Resistance (k ohms)

14.92

12.49

11.88

10.00

8.06

7.69

6.53

5.33

5.10

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