1. Avoid installing units, with non-ducted return air, directly above
spaces where noise is critical.
2. Use exible connections between unit and rigid ducting.
3. Use generously sized acoustically lined ducts.
4. If generous duct size is not possible, use turning vanes on bends
to reduce air turbulence (regenerated noise).
5. Use 90° bends in ducting to signicantly assist in noise reduction.
If an fault is detected, an 'ERR' symbol will light up on the Wall plaque display.
The following error codes may be displayed:
1 Room sensor #1 failure Main board AD3
2 Room sensor #2 failure Main board AD4
3 Room sensor #3 failure Main board AD5
4 Room sensor #4 failure Main board AD6
5 #1 indoor coil sensor failure Main board AD1
6 #1 LST sensor failure Main board AD2
7 #1 insufcient refrigerant
8 #1 compressor overload
9 #1 low pressure failure
10 #1 high pressure failure
11 Room sensor #5 failure At wallpad B
12 Room sensor #6 failure At wallpad A
13 All room sensor failure
14 Float switch failure
15 #1 Low safety thermostat failure
16 Communication failure
17 Hydronic pump switch failure
18 #2 insufcient refrigerant
19 #2 compressor overload
20 #2 Low safety thermostat failure
21 Discharge sensor 1 failure
22 Discharge sensor 2 failure
23 Discharge temp 1 failure
24 Discharge temp 2 failure
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