Carrier 35L Series, Installation And Start-Up Instructions Manual

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10
Analog Control Troubleshooting —
The follow-
ing troubleshooting guide is directed towards single duct cool-
ing applications, the same concepts can be applied to other
configurations.
CONTROLLER
1. Verify 24 vac at terminals “~” (phase) and “-” (ground).
Tolerance can be –15% to +20% (20.4 to 28.8 vac).
2. Verify 16 vdc at terminals “16 VDC” and “-”.
a. Tolerance is 15.0 to 17.0 vdc power supply to
thermostat.
b. If not correct, disconnect thermostat and recheck.
If still incorrect, replace CSP controller.
3. Check requested flow voltage on terminal “IN” and “-”.
a. Use charts on pages 6 and 7, Fig. 4A-4C to corre-
late into cubic feet per minute (cfm).
b. If reading is not what is desired, see the System
Calibration of the Linear Averaging Flow Probe
section to adjust thermostat.
4. Check actual flow voltage on terminal “OUT” and “-”
(for 0 to 10 vdc).
Use charts on pages 6 and 7, Fig. 4A-4C to correlate into
cfm.
5. Check box movement, damper rotation, etc.
a. Review requested flow and actual flow parameters
above to determine if unit should be satisfied
(within 50 fpm) or driving open or closed.
b. If damper is not moving, verify damper is not stuck
or at end of travel. Check rotation jumpers for
proper position.
c. Change requested flow to make unit drive opposite
direction. This can be accomplished by moving the
set point sliders or 1) and 2) below.
1.) To manually open the box, remove wiring from
terminal “IN” and jumper terminal “IN” to ter-
minal “16VDC”. This will tell unit to control at
3300 fpm/full airflow, and the green LED
should turn on (and the box should drive open).
2.) To manually close the box, remove wiring from
terminal “IN”, jumper and “IN” terminal to “-”
terminal. This will tell unit to control at zero
fpm/no airflow, and the red LED should be on
(and the box should drive closed).
NOTE: When using the same transformer for more than one
control, the phase and ground must be consistent with each
device.
ComfortID™ CONTROLS
Install Sensors and Make Field Wiring
Connections
GENERAL — All field wiring must comply with National
Electrical Code (NEC) and local requirements. Refer to
Tables 8-11 for electrical and wiring specifications.
For information on how to test and balance CCN controls,
refer to the 33ZC Installation and Operation Instructions.
Wire the control as shown on the control package diagram
for the specific installation. Control wiring diagrams can be
found inside the control box.
SUPPLY-AIR TEMPERATURE (SAT) SENSOR INSTAL-
LATION — On terminals with heat, the SAT sensor is provid-
ed. The sensor is factory wired to the controlled and shipped in
the control box. The SAT must be field-installed in the duct
downstream from the air terminal. The SAT sensor part num-
ber is 33ZCSENSAT. See Table 8 for resistance information.
To install the sensor, proceed as follows:
1. Remove the plug from one of the
7
/
8
-in. openings in the
control box and pass the sensor probe through the hole.
2. Drill or punch a 1 /
2
-in. hole in the duct downstream of
the unit, at a location meeting the requirements shown in
Fig. 11.
3. Using 2 self-drilling screws (supplied), secure the sensor
probe to the duct.
The SAT sensor probe is 6 inches in length. The tip of the
probe must not touch the inside of the duct. Use field-supplied
bushings as spacers when mounting the probe in a duct that is
6 in. or less in diameter.
If the unit is a cooling only unit, the SAT sensor is not pro-
vided and is not required.
For units with hot and cold airstreams, locate SAT sensor
probe at least 2 ft downstream (see Fig. 11).
Perform the following steps if state or local code requires
the use of conduit, or if your installation requires a cable length
of more than 8 ft:
1. Disconnect the sensor cable from the ComfortID zone
controller, at the terminals labeled SAT and GND.
2. Mount the sensor to the duct (see steps 2 and 3 above).
3. Mount a field-supplied 4-in. x 4-in. x 20-in. extension
box over the duct sensor.
4. Connect a conduit ( 1 /
2
-in. nominal) to the zone controller
enclosure and extension box.
5. Pass the sensor probe through the extension box opening
and into the conduit.
6. Reconnect the sensor leads to the zone controller labeled
SAT and GND.
Never jumper terminal 16 VDC to “-” as this would cause
a short, and possibly damage the power supply.
Disconnect electrical power before wiring inside the con-
troller. Electrical shock, personal injury, or damage to the
zone controller can result.
DO NOT run sensor or relay wires in the same conduit or
raceway with Class 1 service wiring.
DO NOT abrade or nick the outer jacket of cable.
DO NOT pull or draw cable with a force that may harm the
physical or electrical properties.
DO NOT bend a cable through a radius sharper than that
recommended by its manufacturer.
AVOID splices in any control wiring.
LEAVING
AIR
HEATED
AIR
COOL
AIR
2 FT. MIN.
SAT
ZC
Fig. 11 — Supply Air Temperature Probe
(Part No. 33ZCSENSAT) Locations
LEGEND
SAT — Supply Air Temperature Sensor
ZC — Zone Controller