During a lock out, the LOR-2 contacts are closed, energizing
the X terminal on the terminal board for lighting a lock out
warning light.
Resetting the Lock Out
The lock out may be reset by:
•
Turning the thermostat switch to OFF, or
•
Momentarily adjusting the cooling set point to its maxi-
mum allowed value.
If the unit does not resume operation after the anti-short cycle
timer expires or if it continues to lock out after resuming
operation, call a service technician to diagnose and repair the
unit.
CAUTION: Repeatedly resetting the lock out may cause dam-
age to the unit.
Second Stage of Cooling
The second stage of cooling will only be enabled if the first
stage of cooling is on, closing auxiliary contact 1M-AC1. A call
for cooling at terminal Y2 energizes Relay RY2, closing contact
RY2-1, and energizing time delay relay 4TR if contact 1M-AC1
is closed. If time delay relay 4TR is satisfied, it will energize its
output terminal Y2, which is connected to compressor 2 control
module terminal M1.
If the compressor 2 control module is satisfied, it will energize
time delay relay TDR. After 4 seconds, TDR energizes com-
pressor 2 contactor 2M.
When 2M is energized on H3CE240 units, auxiliary contact
2M-AC1 is closed, powering terminal 2 for opening the stage 2
solenoid in air handlers which feature a stage 2 solenoid.
LOW AMBIENT COOLING
The following accessories are available to provide low ambient
operation to 0
°
F:
SAFETY FEATURES
1. The compressor is protected against over current and
excessive temperature as described in the Sequence of
Operation.
2. The compressor is equipped with a crankcase heater to
discourage refrigerant migration into the compressor sump
during the “OFF” cycle.
3. The condenser fan motors have auto-reset internal protec-
tion.
4. The secondary of every transformer is grounded.
5. Every unit is protected by high and low-pressure controls .
CAUTION:
DO NOT ATTEMPT TO START THE COMPRESSOR WITHOUT
AT LEAST 8 HOURS OF CRANKCASE HEAT OR COMPRES-
SOR DAMAGE WILL OCCUR.
2LA04704225
208/230 VOLTS
2LA04704346
460 VOLTS
2LA04704458
575 VOLTS
SECURE OWNER’S APPROVAL:
When the system is functioning properly, secure the owner’s approval. Show him the
location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature
settings within the limitations of the system.
MAINTENANCE
CLEANING CONDENSER SURFACE
Dirt should not be allowed to accumulate on the condenser coils
or other parts in the condenser air circuit. Clean as often as
necessary with a brush, vacuum cleaner attachment or other
suitable means.
LUBRICATION
The fan motors for these condensing units are equipped with
factory lubricated and sealed ball bearings. They do not require
any maintenance.
COMPRESSOR REPLACEMENT
Contact the local UPG Distribution Center for compressor or
parts.
P.O. Box 1592, York, Pennsylvania USA 17405-1592
Subject to change without notice. Printed in U.S.A
Copyright
by York International Corporation 1998. All Rights Reserved.
Code: SBY
550.23-N6Y
