13
TESTING THE SENSORS
Do not apply voltage to the sensor or to the sensor input of the control as this will result in damage
to either the sensor, the control, or both the sensor and the control.
A quality testing meter capable of measuring up to 2,000,000 ohms and a good quality digital
thermometer are required to test the sensors. If a digital thermometer is not available, place a
second sensor next to the original sensor and compare the readings.
Begin by measuring the temperature at the sensor location using the digital thermometer. Next,
measure the resistance of the sensor using the testing meter. Ensure that the sensor is discon-
nect from the control at the time of testing. Using the reference chart below, determine the sensor’s
temperature. Compare the sensor’s temperature to that measured by the digital thermometer. The
two temperature readings should be close.
If the sensors temperature is too high, this can indicate that there is a partial short in the sensor
wiring. If the sensor’s temperature is too low, this can indicate that there is a loose connection or
break in the sensor wiring. Isolate and repair the problem. If the problem is isolated to the sensor,
replace the sensor.
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
-34
-29
-23
-18
-12
-7
-1
4
10
16
21
27
32
38
43
49
54
60
66
71
77
82
88
93
234,000
165,000
118,000
85,500
62,500
46,000
34,500
26,000
20,000
15,500
12,000
9,300
7,300
5,800
4,700
3,800
3,100
2,500
2,000
1,700
1,400
1,200
1,000
800
Temperature Resistance
F
C
Ohms
Temperature Resistance
F
C
Ohms
Temperature Resistance
F
C
Ohms
Temperature Resistance
F
C
Ohms
EEPROM Read Error
The control was unable to read the in-
stallers settings from its memory. The
control was forced to load the factory
defaults for all settings. The control will
stop operation until all of the settings
in the Adjust menu have been checked.
O
Error Messages
VIEW
!
MIX
VIEW
!
RET
Mixing Return Sensor Short Circuit
A short circuit has been detected in the
mixing return sensor. If the Maximum
Delta T setting is set to OFF, the con-
trol continues operation. If the Maxi-
mum Delta T setting is not set to OFF,
the control stops operation until the
fault is corrected. To clear this error
message, correct the short circuit and
press any button on the control.
M
Outdoor Sensor Short Circuit
A short circuit has been detected in the
outdoor sensor. The control assumes
an outdoor temperature of 32
°
F (0
°
C)
and continues operation. To clear this
error message, correct the short circuit
and press any button on the control.
OUT
VIEW
!
MIX
VIEW
!
RET
Mixing Return Sensor Open Circuit
An open circuit has been detected in
the mixing return sensor. If the Maxi-
mum Delta T setting is set to OFF, the
control continues operation. If the Maxi-
mum Delta T setting is not set to OFF,
the control stops operation until the
fault is corrected. To clear this error
message, correct the open circuit and
press any button on the control.
B
Outdoor Sensor Open Circuit
An open circuit has been detected in
the outdoor sensor. The control as-
sumes an outdoor temperature of 32
°
F
(0
°
C) and continues operation. To clear
this error message, correct the open
circuit and press any button on the con-
trol.
OUT
VIEW
!
VIEW
!
BOIL
Boiler Sensor Short Circuit
A short circuit has been detected in the
boiler sensor. The boiler contact is
operated as if a boiler sensor is not
installed. The control provides a boiler
enable and does not provide boiler pro-
tection. To clear this error message,
correct the short circuit and press any
button on the control.
Summary of Contents for Radiant Mixing Block
Page 2: ...2 Typical Piping ...
