Pre−Start−Up/Start−Up - Carrier 558J Series Service And Maintenance Instructions

7. Remove the jumper from TR and N. The actuator
should drive fully closed.
8. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
Supply−Air Sensor Input
To check supply−air sensor input:
1. Make sure EconoMi$er IV preparation procedure has
been performed.
2. Set the Enthalpy potentiometer to A. The Free Cool
LED turns on. The actuator should drive to between
20 and 80% open.
3. Remove the 5.6 kilo−ohm resistor and jumper T to
T1. The actuator should drive fully open.
4. Remove the jumper across T and T1. The actuator
should drive fully closed.
5. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
EconoMi$er IV Troubleshooting Completion
This procedure is used to return the EconoMi$er IV to
operation. No troubleshooting or testing is done by
performing the following procedure.
1. Disconnect power at TR and TR1.
2. Set enthalpy potentiometer to previous setting.
3. Set DCV maximum position potentiometer to previ-
ous setting.
4. Set minimum position, DCV setpoint, and exhaust po-
tentiometers to previous settings.
5. Remove 620−ohm resistor from terminals SR and +.
6. Remove 1.2 kilo−ohm checkout resistor from termi-
nals SO and +. If used, reconnect sensor from termi-
nals SO and +.
7. Remove jumper from TR to N.
8. Remove jumper from TR to 1.
9. Remove 5.6 kilo−ohm resistor from T and T1. Recon-
nect wires at T and T1.
10. Remove jumper from P to P1. Reconnect device at P
and P1.
11. Apply power (24 vac) to terminals TR and TR1.
PRE−START−UP/START−UP
WARNING
!
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal
injury or death.
1. Follow recognized safety practices and wear
approved Personal Protective Equipment (PPE),
including safety
checking or servicing refrigerant system.
2. Do not use a torch to remove any component.
System contains oil and refrigerant under
pressure. To remove a component, wear PPE and
proceed as follows:
a. Shut off all electrical power to unit. Apply
applicable Lock−out/Tagout procedures.
b. Recover refrigerant to relieve all pressure
from system using both high−pressure and
low pressure ports.
c. Do not use a torch. Cut component connec-
tion tubing with tubing cutter and remove
component from unit.
d. Carefully un−sweat remaining tubing stubs
when necessary. Oil can ignite when exposed
to torch flame.
3. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is
in place and secured.
4. Do not remove compressor terminal cover until
all electrical power is disconnected and approved
Lock−out/Tagout procedures are in place.
5. Relieve all pressure from system before touching
or disturbing anything inside terminal box
whenever refrigerant leak is suspected around
compressor terminals.
6. Never attempt to repair a soldered connection
while refrigerant system is under pressure.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning result in personal injury
or death.
The unit must be electrically grounded in accordance
with local codes and NEC ANSI/NFPA 70 (American
National Standards Institute/National fire Protection
Association.
Proceed as follows to inspect and prepare the unit for
initial start−up:
1. Remove all access panels.
2. Read and follow instructions on all WARNING,
CAUTION, and INFORMATION labels attached to,
or shipped with, unit.
47
glasses and gloves when