Trane Horizon OANG Series - Control Power Transformers and Wiring; 24 Vac Control Wiring; DC Analog Input;Output Wiring

Installation
OAU-SVX006E-EN 37
Control Power Transformer
The 24-volt control power transformers are to be used only
with the accessories called out in this manual.
Transformers rated greater than 50 VA are equipped with
internal circuit breakers. If a circuit breaker trips, turn “Off”
all power to the unit before attempting to reset it.
The transformers are located in the control panel. The
ci
rc
uit breaker is located on the left side of the
transformers and can be reset by pressing in on the black
reset button.
Controls Using 24 Vac
Before installing any connecting wiring, refer to Figure 38,
p. 33 for the electrical access locations provided on the
unit and Table 6 for AC conductor sizing guidelines, and:
1. Use copper conductors unless o
therwise specified.
2. Ensure that the AC control wiring between the controls
and the unit’s termination point does not exceed three
(3) ohms/ conductor for the length of the run.
Note: Res
i
stance in excess of 3 ohms per conductor
may cause component failure due to
insufficient AC voltage supply.
3. Be sure to check all lo
ad
s and conductors for grounds,
shorts, and mis-wiring.
4. Do not run the AC low-volta
ge wiring in the same
conduit with the high-voltage power wiring.
Controls Using DC Analog Input/Output
(Standard Low Voltage Multiconductor
Wire)
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
AVERTISSEMENT
Risque d’électrocution!
Le non-respect de cette consigne peut entraîner des
blessures graves, voire mortelles. Avant toute
intervention, coupez l’alimentation électrique, y
compris aux sectionneurs à distance. Suivez
scrupuleusement les procédures de verrouillage/mise
hors service préconisées pour empêcher tout
rétablissement accidentel de l’alimentation électrique.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
AVERTISSEMENT
Risque d’électrocution!
Le non-respect de cette consigne peut entraîner des
blessures graves, voire mortelles. Avant toute
intervention, coupez l’alimentation électrique, y
compris aux sectionneurs à distance. Suivez
scrupuleusement les procédures de verrouillage/mise
hors service préconisées pour empêcher tout
rétablissement accidentel de l’alimentation électrique.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as unit terminals are not designed
to accept other types of conductors.
Table 6. 24 Vac conductors
Distance from Unit to Control Recommended Wire Size
000–460 feet
000–140 m
18 gauge
0.75 mm
2
461–732 feet
104–223 m
16 gauge
1 mm
2
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
AVERTISSEMENT
Risque d’électrocution!
Le non-respect de cette consigne peut entraîner des
blessures graves, voire mortelles. Avant toute
intervention, coupez l’alimentation électrique, y
compris aux sectionneurs à distance. Suivez
scrupuleusement les procédures de verrouillage/mise
hors service préconisées pour empêcher tout
rétablissement accidentel de l’alimentation électrique.