Emerson Autochangeover Controllers AC8 - Manual (Page 20)

Installation
12
24 VAC Output Power Connections
To connect to the 24VAC outputs:
1. Install electrical wiring from device requiring 24VAC power to the Transformer Module.
2. Use copper wire only; proper wiring to use for power is 18, 20 or 22 AWG copper wire. Strip
wire 1/4".
3. There are two 24 VAC output connectors (TB1 and TB2). Terminate wires to the connector as
shown in Figures 6 and 7. TB1 and TB2 are NOT polarity sensitive.
4. Secure the wires to the connector.
Troubleshooting - Transformer Module
A common problem and possible solution are shown in the table below. For further information or if
you have other problems with the unit, consult your local dealer, Liebert representative or the Liebert
Worldwide Support Group.
2.4.2 Connecting the Battery Pack
Before connecting input power to the AC8, connect
the panel’s backup battery (factory-supplied) to the
jumpers so it will begin charging when electrical
power to the AC8 is switched on.
To connect the battery pack, insert the battery
leads into the jumpers as shown at right.
(To disconnect the battery pack, remove the
battery leads from the jumpers.)
Obtaining a Replacement Battery Pack
To obtain a replacement battery pack, contact your
local dealer or Liebert representative. The Liebert
part number is 133455P1.
2.4.3 Turning On the AC8
After connecting the backup battery, turn on the power On/Off switches to the AC8 and the Trans-
former Module (see 1.7 - Controller Board Overview for location of switches).
Figure 6 Power wiring to TM115 Figure 7 Power wiring to TM230
Problem Possible Solution Replacement Fuse Part Numbers
24VAC power
not available
from TB1 or TB2
Check fuse for respective
output (TB1 or TB2).
• LITTLEFUSE 218002
or
• BUSSMANN GDC-2A
NOTE
If the battery is not hooked up BEFORE the
AC8 is switched on, it will trigger an alarm.
!
WARNING
To prevent the risk of fire or explosion, replace only with 7.2 V rechargeable NiCad battery pack.
!
CAUTION
Dispose of the battery properly by sending it back to Liebert Corporation or an approved
battery recycling facility.
Wire nuts
connecting
electrical
wiring
24VAC output
(TB1)
Ground
Knockout for
external wiring
TM115
Neutral
(L2)
24VAC output
(TB1)
Ground
Knockout for
external wiring
TM230
Line (L1)
Battery pack connector
Battery pack