Product manual

25
Emerson ZX Platform Condensing Unit
PRODUCT MANUAL
Fault Type
Discharge Line
And Coil In
Temperat ure
Sensors
Failure
Ambient
Temperat ure
Sensor Failure
Condenser
Mid-Coil
Sensor Failure
PHE Vapor In
Sensor Failure
(Only Low
Temp Unit)
PHE Vapor
Out Sensor
Failure
(Only Low
Temp Unit)
Trip Set Point
(A) Actual DLT>160°C
(B) DLT Sensor fails
and Actual DLT> 80°C
(C) Both coil-in and
DLT sensor fail (short
circuit)
(D) Coil in sensor
fails(short) and
actual DLT<73˚C
(A) Coil in sensor
fails(open) and
actual DLT<73˚C
(B) Both coil-in and
DLT sensor fail (open
circuit)
Ambient sensor
reads <-30˚C or
>63˚C
Mid coil sensor reads
<-30˚C or >63˚C
Vapor In sensor
reads <-16˚C or
>73˚C
Vapor out sensor
reads <-16˚C or
>73˚C
E2 Control Actions
(Only Low Temp Unit)
-Stop the unit
-Display DLT sensor failure on the
diagnostic
-D isplay waiting to restart on diagnostic
-Auto start the unit after 3 minutes
-L ockout unit if 6 trips in less than 1 hour
-Display DLT sensor failure lockout on
diagnostic
-Initiate Buzzer/ Dialer Relay
(Only Med Temp Unit)
-Display DLT sensor failure on
diagnostic
-Continue to run the unit on default
mode
(Both Low and Med Temp Unit)
-Display DLT sensor failure on
diagnostic
-Continue to run the unit on default
mode
-Display ambient temp sensors failure
on diagnostic
-Continue to run the unit on default
mode
-Display mid coil temp sensors failure
on diagnostic
-Continue to run the unit on default
mode
-Display sensor error on diagnostics
-Continue to run the unit on default
mode
-Display sensor error on diagnostics
-Continue to run the unit on default
mode
Auto Resets
5 Auto start
in I Hour
Run
Run
Run
Run
Run
Run
Possible Error And Solution
-Check liquid sight glass is full. If
not, system must have leakage at
somewhere;
-Check whether DLT sensor is
connected to control board;
-Check whether DLT sensor is OK.
If not, replace it with a good one;
-Check whether Coil In sensor is
OK. If not, replace it with a good one
-Check whether the sensors are
connected to control board;
-Check whether Coil-in is OK. If
not, replace it with a new one;
-Check whether compressor is
having excessive flood back.
-Check whether actual Ambient
temperature is out of range;
-Check whether Ambient sensor is
OK and connected to control board.
-Check whether actual mid-coil
temperature is out of range;
-Check whether mid-coil sensor is
OK and connected to control
board.
- Check whether actual temperature
is out of range;
-Check whether the sensor is
connected to control board;
-Check whether the sensor is
mounted at the right position;
-Check whether the sensor is in heat
isolation material;
-Check whether the sensor is failed.
Vapor injection: specific application tips
ZX LT CDU
ZX LT CDU applies vapor injection technology. As explained in the previous section, vapor injection improves LT operational efficiency and
provides a reliable LT envelope. Vapor injection sub cools the main liquid line using the economizer cycle. The sub cooling of liquid line calls
for some specific application tips which are applicable only for ZX LT CDU. They are
1. Liquid line pipe connecting the CDU service valve to the evaporator expansion valve has to be well insulated separately. The
recommended insulation thickness is 12.5 mm (1/2 inches)
2. The lower liquid in temperature can increase the evaporator expansion valve capacities. Please follow valve manufactures recommended
liquid temperature correction factors for proper selection of evaporator expansion valve.