Watlow QPAC-01 - Page 15

Starting Out
15
QPAC User's Manual
How to Install and Wire the QPAC, Chapter 2
Circuit
Breakers
or
Disconnects
Contactors
If Required
Onboard,
factory
installed
semicon-
ductor
fuses
QPAC-01 150 - 1000A
Heater
Load
L1
L2
Fan 120VAC/20W
L2
L1
T1
Figure 17 -
QPAC-01 Wiring
for 75-100A Units
Figure 18 -
QPAC-01 Wiring
for 150 - 1000A Units
ç
CAUTION:
Check terminals for tightness before applying power and then recheck terminals
after one day of operation. Loose connections can damage the SCR.
Wire QPAC-01
① NOTE:
On 120Vac or
277Vac, L2 is neutral
and cannot be
broken
② NOTE:
A contactor is
required if a high
limit control is used.
➂ NOTE:
A separate discon-
nect is required for
the fan(s) if used.
➃ NOTE
Use 14 - 16 gauge
wire for control
power only
Circuit
Breakers
or
Disconnects
Contactors
If Required
Fan 120VAC/20W
Heater
Load
QPAC-01 75-100A
L2
L1
Factory supplied,
customer installed
external semi-
conductor fuse
L2 T1 T2L1
①
②
➂
①
1 Amp Fuse
➃
➂
②