Troubleshooting Water Modulating Actuator Diagnostics; Figure 41 Led Fault Illumination; Figure 42 Iseries Smart Actuator; Table 14 Multi-Status Led - Bard QW2S3DA Installation Instructions Manual

FIGURE 41
LED Fault Illumination
Green Status Light
Troubleshooting Water Modulating
Actuator Diagnostics
The Bard QW*S3D Series is equipped with a water
modulating actuator. The water modulation is achieved
through the operation of a TACO iSeries Smart
Actuator, attached to a TACO 3-way valve.
The iSeries Smart Actuator is a microprocessor-based
valve designed to provide a setpoint (fixed) temperature
to a HVAC system by modulating the position of a
mixing valve. The iSeries Smart Actuator is shown in
Figure 42.
HP = Green Fault
Illumination
LP = Orange Fault
Illumination
Troubleshooting the iSeries Smart Actuator
As in any troubleshooting procedure, it is important
to isolate a problem as much as possible before
proceeding. The error message greatly simplifies
troubleshooting of the iSeries-S. When the control
FS (Evap) =
flashes an error message, identify the fault by observing
Red Fault
Illumination the LED status light code and follow standard testing
procedures to confirm the problem. The LED status
code and error can be diagnosed by following the light
sequences in the multi-status LED table (Table 14).
CO = Yellow Fault
If a wiring fault is suspected, return to the wiring
Illumination
diagram located on the unit door and carefully inspect
all external wiring and wiring connections.
Testing the Sensors
LED
Green
Red
A good quality test meter capable of measuring up to
5,000 kΩ (1 kΩ= 1000 Ω) is required to measure
the sensor resistance. In addition to this, the actual
temperature must be measured with a good quality
digital thermometer.
First measure the temperature using the thermometer
and then measure the resistance of the sensor at the
iSeries Smart Actuator. The wires from the sensor
must not be connected to the iSeries Smart Actuator
while this test is performed. The wiring terminals are
easily removed by pulling them from the iSeries Smart
FIGURE 42
iSeries Smart Actuator
BOILER
POWER = GREEN
SUPPLY
SENSOR
= RED
ERROR
OUTDOOR
TABLE 14
Multi-Status LED
LED Status ISeries Smart Actuator Status
Solid Power On
Reduced Output
Flash
(System Protection Activated)
Flash, Pause, System Supply Sensor Fault
Flash, Pause, The iSeries-S operates at a
Flash, ... fixed output
STATUS LIGHT
C R
24 VAC
POWER INPUT
SENSOR
COMMON
MIS-4135
Manual 2100-738C
Page 65 of 73