Electrical Connections - Geostar ASTON Series Installation Manual

ASTON DUAL-CAPACITY OUTDOOR SPLIT SERIES INSTALLATION MANUAL

Electrical Connections

General
Be sure the available power is the same voltage and phase as that
shown on the unit serial plate. Line and low voltage wiring must be
done in accordance with local codes or the National Electric Code,
whichever is applicable.
Unit Power Connection
Connect the incoming line voltage wires to L1 and L2 of the
contactor as shown in Figure 13C for single-phase unit. Consult
the Unit Electrical Data in this manual for correct fuse sizes.
Open front access panel. Insert power wires through knockouts
on the bottom side of cabinet (Figure 13A). Route wires through
the bottom of the control box and connect to contactor and ground
(Figure 13B). Close control box and replace fastener before unit
start-up.
Figure 13A:
Wire access (control box open)
Accessory Relay
A set of "dry" contacts has been provided to control accessory
devices, such as water solenoid valves on open loop installations,
electronic air cleaners, humidifiers, etc. This relay contact should
be used only with 24 volt signals and not line voltage power. The
relay has both normally open and normally closed contacts and
can operate with either the fan or the compressor. Use DIP switch
SW2-4 and 5 to cycle the relay with blower, compressor, or control
a slow opening water valve. The relay contacts are available on
terminals #2 and #3 of P2.
When powering high VA draw components such as electronic air
cleaners or VM type open loop water valves, R should be taken
'pre-fuse' from the 'R' quick connect on the ABC board and not the
'post-fuse' 'R' terminal on the thermostat connection. If not, blown
ABC fuses might result.
208 Volt Operation
All 208/230 units are factory wired for 230 volt operation. For
208 volt operation, the red and blue transformer wires must be
switched on terminal strip PB2.
Figure 13B:
Line Voltage 208-230/60/1 control box
Wire Insert
Location
10
PB1
T2 T1
L2 L1