8
FLOW CENTER INSTALLATION AND LOOP FLUSHING MANUAL
Single-Speed Units
If a single-speed unit is to be used, the pump(s) will be con-
nected to the terminals on PB1 in the unit electrical box as shown
in Figure 3. The pumps will automatically be cycled as required
by the unit or by a signal from another unit sharing the fl ow
center (See Figures 5 and 6). Pumps are fused through the PCB
(Printed Circuit Board).
Dual Capacity
If a two-speed or dual capacity unit is used, the pumps will
be connected to the pump power block (PB1) as shown in Figure
4. The pumps will automatically be cycled as required either by
the unit or by a signal from another unit sharing the same fl ow
center.
Electrical Information
Compressor
Contactor
Transformer
External
Loop Pump(s)
208-230/60/1
1/2 HP Max
Voltage
Selection
Rocker
Switch
PS
PB1
Ground
Lugs
Unit Control
Board
208-230/60/1
Service with
Ground
L1
L2
D
C
A
Compressor
Capacitor
Figure 3: Single Speed Field Unit Wiring for Loop
Pumps
Figure 4: Dual Capacity Unit Wiring for Loop Pumps
D
Blk
Blu
C
B
A
START CAP
PB2
CCL
CCH
PB 1
TRANS
P
CB
P 1
P 2
L1
L2
External Loop
Pump
208-230/60/1
½ HP max
Notes:
For closed loop systems with antifreeze protection, set SW2
DIP Switch #2 to the "Loop" position on units.
