Start; System Operation - York YMGE36BNO-MS-X User Manual

10. START-UP
■
PACKAGING AND COMPONENTS
●
Is the unit properly located and level with the proper clearance?
●
Is the duct work correctly sized, run, taped, insulated, and
weatherproofed with proper unit arrangement? See Ductwork
Installation section.
●
Is the wiring properly sized and run according to the unit wiring
diagram?
●
Are all the wiring connections, including those in the unit,
tight?
●
Has the unit been properly grounded and fused with the recommended
fuse size? See Wiring Data.
●
Have the air conditioning systems been checked at the service
ports for charge and leak tested if necessary?
●
Does the condenser fan and indoor blower turn free without
rubbing, and are they tight on the shafts?
●
Has the indoor blower speed been determined and the proper
speed been set? See the Unit Wiring Diagram.
●
Are all covers and access panels in place to prevent air loss
and safety hazards?
■
STARTING THE UNIT IN THE COOLING MODE
To start the unit in the cooling mode, set the thermostat system
switch to COOL and move the thermostat COOL indicator to
a setting below room temperature. The condenser (outdoor)
fan motor compressor and evaporator (indoor) fan motor will
operate automatically.
Allow the heater to operate a minimum of eight (8) hours.
■
CAUTION
Before starting the system on the cooling cycle, turn the
thermostat switch to OFF and close the unit disconnect
switch. This procedure energizes the compressor crankcase
heater, vaporizing any liquid refrigerant in the crankcase. This
is a precaution against foaming at startup which could
damage the compressor bearings.
■
VOLTAGE
With the compressor operating, check the line voltage at the
unit. The voltage should be within the range shown on the
unit nameplate.
If low voltage is encountered, check the size and length of
the supply line from the main disconnect to the unit. The line
may be undersized for the length of the run.
■
COOLING SHUT DOWN
Place the system selector in the OFF position or reset
thermostat at a setting above room temperature.
Do not de-energize the main power disconnect except when
unit is to be serviced. Power is required to keep the heat
pump compressor warm and boil off refrigerant in the
compressor.
11.

SYSTEM OPERATION

LED DISPLAY
■
The control would display any fault code that is currently active
using the LED. The control will display the fault code, when the
LEDS are flashing quickly,there is something wrong with the
system. Refer to below table for detail fault code.
Function:
1. the compressor and indoor fan will start when the system is
energized, outdoor fan starts with compressor.
2. When the system is de-energized, the outdoor fan and compressor
would close soon,but the indoor fan would closed later.
■ Operational Codes:
NUM CODE
1
STANDBY
2
FUNCTION
PHASE-MISSING
3
PHASE-ERROR
T1 SENSOR FAILURE
4 HIGH PRESSURE PROTECTION
VENT PROTECTION
5
T2 SENSOR FAILURE
T3 SENSOR FAILURE
6
7 T4 SENSOR FAILURE
8 T2 EVAPORATOR LOW TEMP. PROTECTION
T2 EVAPORATOR HIGH TEMP.PROTECTION
9
10
T3 CONDENSOR HIGH TEMP.PROTECTION
11
WIRED CONTROLLER INPUT FAILURE
COMPRESSOR OVERCURRENT PROTECTION
12
COMPRESSOR-INHALING LOW
13
PRESSURE PROTECTION
14
DEFROST
Low pressure switch
■
The control will detect the status of low pressure switch,
which is normally close.If the low pressure switch is open
during the first time of power supply, the control will de-
energized the compressor. If low pressure switch protection
appears 3 times in 20 minutes, the control should be restored
by switch off the power supply. The control will ignore the
low pressure switch input during the following conditions:
defrost operation, 4 minutes following the completion of a
defrost cycle, first 5 minute of compressor operation during
the heat mode.
■ HIGH-PRESSURE SWITCH
The Unit is equipped with a high-pressure switch that is connected
to the main board, If the high-pressure switch opens for more than
40 milliseconds, the control will de-energize the compressor and
store and display the appropriate fault code. If the pressure switch
closes and a thermostat call for compressor operation is present,
the control will apply the three-minute anti-short cycle delay timer
and start the compressor when the timer expires.
TEMPERATURE SENSOR
■
The unit have two temperature sensors, which are called T3 and
T4,T3 means pipe temperature sensor, T4 means outdoor unit
circumstance temperature sensor. When the temperature sensor
was damaged, the system would closed and the LED would flashing.
INDICATIONS OF PROPER OPERATION
■
when the LEDS in a lighting states, no matter which one, it is
means the system runs properly.
LED1(Red) LED2(Yellow) LED3(Green)
OFF OFF ON
ON
ON
ON
FLASH
FLASH FLASH
OFF
FLASH
FLASH
FLASH
OFF
FLASH
OFF FLASH
FLASH
ON
FLASH
FLASH
OFF OFF
FLASH
FLASH
ON ON
OFF
FLASH OFF
ON
FLASH FLASH
OFF OFF
FLASH
FLASH
ON
FLASH
ON
FLASH
ON
I&O manual
13