Honeywell ALERTON ACM-VLX Installation And Operation Manual page 28

Installation and Operations Guide
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ACM-VLX/VLX/EXP/AXM
Always provide a separate transformer for EXP/AXM unit power
WAR NING
and EXP/AXM BO power. Powering BOs and the EXP/AXM unit from the
same power supply will cause interference and may damage the EXP/AXM.
Table 4 EXP/AXM powe r te rminals
Labe l De s c riptio n
24 VAC Us e to te rminate the hot le g of the 24 VAC circuit. Can als o be jumpe re d to
24 VAC te rminals on othe r EXPs /AXMs for trans forme r s haring. DO NOT
CONNECT THIS TERMINAL TO GROUND. EQUIPMENT DAMAGE WILL
RES ULT.
GND Us e to te rminate the grounde d le g of the 24 VAC circuit. Can als o be
jumpe re d to GND on EXPs /AXMs for trans forme r s haring.
An EXP/AXM will shut down all function when supply
Low voltage threshold
power drops below 18 VAC. Normal operation resumes when supply power rises
above 20.5 VAC.
Transformer sizing
The transformer(s) that provide unit power to the VLX and EXPs/AXMs, as well
as the transformer(s) that provide EXP/AXM BO or VLC power, must be
adequately sized.
For VLX and EXP/AXM unit power, the Nameplate VA rating of the
transformer must be at least 125% of the sum of the unit maximum load ratings
on the unit covers. For VLC and BO power, the Nameplate VA rating of the
transformer must be at least 125% of the BO maximum load rating listed on the
unit covers.
The application consists of:
Example
• 1 VLX
• 1 EXP-10120
• 1 AXM-1048
• 1 AXM-2200

De te rmine the s ize o f the trans fo rme r fo r unit po we r
1. Find the unit power rating on the VLX and EXP/AXM covers. For the
VLX, this is listed as "POWER: VLX MAX LOAD." For EXPs/AXMs,
this is listed as "POWER: AXM MAX LOAD."
2. Add the power required by all devices
Quantity
1
1
1
1
3. Multiply by a 25% safety factor:
80VA X 1.25 = 100 VA
© Honeywell. All Rights Reserved. LT-VLXEXPAXMIOG Rev. 01
De vic e Po we r re quire d
VLX 20 VA
EXP-10120 20 VA
AXM-1048 20 VA
AXM-2200 20 VA
Total: 80 VA