Installation manual

10
5 SERIES 500RO11 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 13B for single-phase unit.
Consult the Unit Electrical Data in this manual for correct
fuse sizes.
Insert power wires through knockouts on lower left side
of cabinet (Figure 13A). Route wires to the right side of
the control box and connect to contactor and ground
(Figure 13B).
Figure 13B:
Line Voltage 208-230/60/1 control box
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.
Wire Insert
Location
L1L2
PB1
T1T2