Nortek GFU18USV4DH - Working Temperature Range; Troubleshooting and Maintenance; Troubleshooting

DC Inverter U-match Series Floor Ceiling Type Unit
27
Indicating Lights:
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“POWER”: The indicating light will be one when power on, while it will go
out when power off.
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“COOL”: Indicates “COOL” function is activated, while it will go out when
“COOL” is deactivated.
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“HEAT”: Indicates when “HEAT” function is activated. It will go out when
“HEAT” is deactivated.
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“TIMER”: Indicates “TIMER” function is activated. It will go out when
“TIMER” is deactivated.
6. 2 Working Temperature Range
Table 6.2
Test Condition
Indoor Side
Outdoor Side
DB(°C/°F)
WB(°C/°F)
DB(°C/°F)
WB(°C/°F)
Nominal Cooling
26.7(80.0)
19.4(67.0)
35.0(95.0)
23.9(75.0)
Nominal Heating
21.1(70.0)
15.6(60.0)
8.33(47.0)
6.11(43.0)
Rated Cooling
26.7(80.0)
19.4(67.0)
46.1(115.0)
23.9(75.0)
Low Temp. Cooling
19.4(67.0)
13.9(57.0)
-18.0(0)
−
Rated Heating
26.7(80.0)
−
23.9(75.0)
18.3(65.0)
Low Temp. Heating
20.0(68.0)
−
-18.0(0)
-
Notes:
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The design of this unit conforms to the requirements of ARI 210/240-2008
standard.
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The air volume is measured at the relevant standard external static
pressure.
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Cooling (heating) capacity stated above is measured under nominal
working conditions corresponding to standard external static pressure. The
parameters are subject to change with the improvement of products, in
which case the values on nameplate shall prevail.
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7 Troubleshooting and Maintenance
7.1 Troubleshooting
If your air-conditioning unit malfunctions or has an operational failure, please