Exd Troubleshooting Procedure - Carrier Ecologic 30GX080-265 Controls, Start-Up, Operation, Service, And Troubleshooting

Table 35 — Illegal Configurations Recognized
by PSIO-1
CODE ILLEGAL CONFIGURATION
NUMBER
Incorrect Check Sum in configuration code
1
(factory or service code)
2 Unit type outside range of (1-3)
Number of compressors in a circuit outside the
3
range of 0-2
Air cooled chiller with a fan type outside the
4
range of 1-16
Air cooled chiller with Low Temperature Brine
5
fluid
Water cooled chiller configured for air cooled
6
head pressure
Selecting both OAT and Space Temp sensors
7
for External Reset operation
8 Air cooled chiller with condenser water pump
9 Air cooled chiller with condenser thermistors
MOP Set point is outside the range of
10
40 - 55 F (4.4 - 12.8 C)
Maximum Condensing Temperature Set point
(MCT _ SP) is outside the range of 0 - 158 F
11
(-17.8 - 70 C)
LEGEND
MOP — Minimum Operating Temperature
OAT — Outdoor-Air Temperature
EXD Troubleshooting Procedure —
below to diagnose and correct EXV/Economizer problems.
On 30HX units with economizers, verify that the valve
for the bubbler tube (bottom of economizer) is open. Check
EXV motor operation first. Press
keypad and select the appropriate EXV. Press
move the valve to 25%. You should be able to feel the ac-
tuator moving by placing your hand on the EXV or econo-
mizer body (the actuator is located about one-half to two-
thirds of the way up from the bottom of the economizer shell).
Press three more times until the display reads 100%
for a Target Percent (waiting until actuator stops each time).
A hard knocking should be felt from the actuator when
EXV DRIVER BOARD, J4
EXV — Electronic Expansion
Valve
Fig. 12 — EXV Cable Connections to EXV Driver Module, DSIO-EXV
DESCRIPTION
Follow steps
on the HSIO II
1
1
RED
GRN
2
3
WHT
4
BLK
BRN
5
2
7
RED
8 GRN
9
WHT
10
BLK
BRN
11
it reaches the top of its stroke (can be heard if
surroundings are relatively quiet). Press
necessary to confirm this. Press
the actuator closed in 25% increments, waiting again in be-
tween each move. The actuator should knock when it reaches
the bottom of its stroke. If it is believed that the valve is not
working properly, continue with the checkout procedure
below:
Check the EXV output signals at appropriate terminals
on EXV driver module (see Fig. 12). Connect positive test
lead to terminal 1 on the EXV driver for Circuit A and to
terminal 7 for Circuit B. Set meter for approximately 20 vdc.
Enter Valves and Motor Master test subfunction by pressing
on the HSIO. The EXV for Circuit A will be dis-
played; if desired, press the down arrow key for Circuit B.
When at the desired valve, press
change to show a Target Percent of 25%. The driver should
drive the circuit EXV under test. During the next several sec-
onds, connect negative test lead to pins 2, 3, 4, and 5 in suc-
cession (pins 8, 9, 10 and 11 for Circuit B). Voltage should
rise and fall at each pin. If it remains constant at a voltage
or shows 0 volts, remove the connector to the valve and
recheck.
Press
address setting (the address should be 50). If a problem still
exists, replace the EXV driver module. If the voltage read-
ing is correct, the expansion valve and EXV wiring should
be checked. Check the EXV terminal strip and interconnect-
ing wiring.
1. Check color coding and wire connections. Make sure they
are connected to the correct terminals at the EXV driver
to
and EXV plug and that the cables are not crossed.
2. Check for continuity and tight connection at all pin
terminals.
Check the resistance of the EXV motor windings.
Remove the DSIO-EXV plug J4 terminal strip and check the
resistance between the common lead (red wire, terminal D)
and remaining leads, A, B, C, and E (see Fig. 12). The re-
sistance should be 25 ohms ± 2 ohms.
D
C
E
B
A
D
C
E
B
A
50
four times to step
. The display should
to close the circuit EXV. Check the DSIO
EXV-A
EXV-B
again if