Installation manual

Page 42 IM-487
The preferred entrance for power cables is through the bot-
tom knockouts provided on the unit. If side entrance is the
only option, a drilling location is provided. The drilling
dimensions must be followed exactly to prevent damage to
the control panel. The dimensions provided are the only pos-
sible point of side entrance for the power cables.
Field Control Wiring
Connect the control wiring as shown on the wiring diagrams
provided with the unit. Units are available with a number of
optional control arrangements. Specific field wiring connec-
tions for these arrangements are described in IM-696 and OM
137 or OM 138.
If unit mounted control devices are to be installed in the field,
control wiring may be run from the device to the main con-
trol box using the control wiring raceway shown in
Figure 47. Connect field wired harnesses to terminal blocks
TB2. TB5. TB7, TB8 or TB10 as indicated on the unit sche-
matics. The field control wiring terminal block TB2 is
located in the main control panel. Refer to Figure 47.
Two 7/8" knockouts are provided for wire entry.
Interconnecting wiring between the rooftop air handler unit
and a remote condensing unit or chiller enters the rooftop air
handler unit through 7/8" knockouts in the bottom of the
main control panel. The 115V wiring is connected to TB5.
Refer to “Typical Control Circuit with Power Pack Only” on
page 50. The TBS output relays must switch "AC" loads. The
load voltage rating must be within the range 24 to 140 VAC.
The maximum load current is 1.8A and the minimum load
current is 30mA. The 24V wiring is connected to terminal
block TB7 which is illustrated in “Typical Main Control Cir-
cuit (VAV Units)” on page 52.
A 7/8" knockout is also available in the end of the unit base
as shown in Figure 48. Note: If a single conduit containing
24V and 115V wiring is run above the roofline, the 24V wir-
ing must be installed as an NEC Class I wiring system.
Figure 47. RAH Field Control Wiring Connections
Figure 48. RAH Interconnecting Control Wiring
CAUTION
Wiring must comply with applicable codes and
ordinances and these specifications.
Defects caused by incorrect wiring are not covered by the
warranty.
WARNING
Electrical shock hazard.
Can cause severe injury or death.
Connect terminal strip TS2 to 24V Class II circuits only.
Do not connect these contacts to a field supplied 115V
power source.
Reinstall and secure all protective deadfront panels when
the wiring installation is complete.
M a i n C o n t r o l
P a n e l
2 4 V F i e l d
T e r m i n a l
B l o c k
( T B 2 )
C o n t r o l W i r i n g R a c e w a y
C o v e r ( R e m o v e f o r a c c e s s
t o h a r n e s s f r o m m a i n c o n t r o l
b o x t o u n i t m o u n t e d
c o n t r o l d e v i c e s )
M a i n
C o n t r o l
P a n e l
T B 7
( 2 4 V )
T B 5
( 1 1 5 V )
C o n d e n s e r
C o n t r o l P a n e l s
R F S U n i t
R C S U n i t
T B 3
( 1 1 5 V )
T B 2
( 2 4 V )