42
Optional Components
AC Interlock
On units equipped with the optional AC interlock,
24V AC
power from a rooftop unit should be field wired to
screw terminal J11-(5) on the MUA board.
24V AC
common from a rooftop unit should be field wired to
terminal block J11-(8) on the MUA board. When these terminals are powered, heat will be locked out on
the RTU.
Burner Interlock
On units equipped with the optional burner interlock,
24V AC
power from a rooftop unit should be field
wired to screw terminal J11-(4) on the MUA board.
24V AC
common from a rooftop unit should be field
wired to terminal block J11-(8) on the MUA board. When these terminals are powered, cooling will be
locked out on the RTU.
Electric Cabinet Heater
Units can be shipped with an optional
120V
electric cabinet heater powered from the MUA board. There is
a temperature sensor built onto the MUA board that will regulate when the cabinet heater activates.
Component Location
Use
for component locations. Units equipped with ERV, refer to
Recovery (Optional)” on page 91
for component descriptions and locations.
Figure 19 - Typical Main Cabinet
15
21
6
8
12
9
16
18
13
17
3
19
10
14
4
7
11
20
2
1
5
