SYNC RLHL SERIES, Installation Instructions Manual, Page: 29 / 48

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FAULTS/LOCKOUTS/MISC.
1. Low-temperature lockout - Occurs at 40°F for the water-
cooled condenser (water heating) mode. Unit will only
operate in the air-cooled condenser mode below 40°F.
2. Standard DDC control lockouts – High pressure control,
low pressure control, low ambient control, etc.
3. Three-way valve failure or water pump failure – A rapid
rise in liquid line pressure will occur. If liquid line pressure
increases above 530 psig in less than one minute and if
three of these trips occur during a call for cooling, a hard
lockout of the water heating mode will occur, but the unit
will still function in the air-cooled condenser mode. The
alarm is reset after a 24-hour delay.
4. Airside solenoid valve failure – shows up as an under-
charge in the water heating mode. Four minutes after the
3-way valve has shifted, if subcooling less than 4° or
superheat more than 25° is continuously measured for
more than 30 seconds, unit will return to air cooled mode. If
this happens three times in a row without a successful run
of at least four minutes in the water heating mode, then a
hard lockout of the water heating mode will occur, but the
unit will still function in the air-cooled condenser mode. The
alarm is reset after a 24-hour delay.
5. Freeze protection - If ambient is <35°F, water pump is
energized until ambient is >37°F.
6. Leak detection - If leak detector senses water, an alarm
signal is sent to the thermostat and waterside operation is
locked out until leak detection ends.
MISC.
1. Water pump is energized once for 6 minutes every 24
hours to keep water from stagnating in times of no cooling
operation.
HEATING MODE
With the thermostat in heat mode, fan on auto, and the room
temperature lower than the thermostat setting, the Indoor
blower contactor is energized through thermostat contact (G).
ONLY ELECTRIC HEATER KITS SUPPLIED BY THIS MAN-
UFACTURER AS DESCRIBED IN THIS PUBLICATION
HAVE BEEN DESIGNED, TESTED, AND EVALUATED FOR
USE WITH THIS UNIT. USE OF ANY OTHER MANUFAC-
TURED ELECTRIC HEATERS INSTALLED WITHIN THIS
UNIT MAY CAUSE HAZARDOUS CONDITIONS RESULTING
IN PROPERTY DAMAGE, FIRE, BODILY INJURY OR
DEATH.
In the heating mode, the thermostat will energize one or more
supplementary heaters.
XIX. MISCELLANEOUS
REPLACEMENT PARTS
Contact your local distributor for a complete parts list.
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FIGURE 16
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