Goodman CONDENSING UNITAIR CONDITIONING, Инструкция по установке и обслуживанию

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13
D
IAGNOSTICS
Accessing the air conditioner/heat pump diagnostics menu pro-
vides ready access to the last six faults detected by the air
conditioner/heat pump. Faults are stored most recent to least
recent. Any consecutively repeated fault is stored a maximum
of three times. Example: The power supply to the air condi-
tioner/heat pump is continuously below 187 VAC. The control
will only store this fault the first three
consecutive times the
fault occurs. Navigate to the diagnostics menu as described
above in
Accessing and Navigating the Advanced Features
Menus .
NOTE: It is highly recommended that the fault history be cleared
when performing maintenance or servicing the furnace.
N
ETWORK TROUBLESHOOTING
Communications is achieved by taking the difference between
a positive dc signal and a negative dc signal. The positive dc
signal is termed “data 1” or “1”. Data 1 is positive with respect
to ground (or common). The negative dc signal is termed “data
2” or “2”. Data 2 is negative with respect to ground (or com-
mon).
Data 1 should be approximately 2.8 volts dc. Data 2 should be
approximately 2.2 volts dc. The voltage difference between
data 1 and data 2 should be approximately 0.6 volts dc.
Verify that the bus TERM dipswitches are in the ON position.
1
2
OFF ON
TERM
TERM
The ComfortNet™ system is a fully communicating system,
and thus, constitutes a network. Occasionally the need to
troubleshoot the network may arise. The integrated control
module has some on-board tools that may be used to trouble-
shoot the network. These tools are: red communications LED,
green receive (Rx) LED, and learn button.
• Red communications LED - Indicates the status of
the network. The table below indicates the LED status
and the corresponding potential problem.
• Green receive LED - Indicates network traffic. The
table below indicates the LED status and the
corresponding potential problem.
• LEARN button - Used to reset the network. Depress
the button for approximately 2 seconds to reset the
network.
S
YSTEM
T
ROUBLESHOOTING
NOTE: Refer to the instructions accompanying the CT
compatible indoor air handler/furnace/modular blower unit for
troubleshooting information.
Refer to the Troubleshooting Chart at the end of this manual for
a listing of possible air conditioner and heat pump error codes,
possible causes and corrective actions.