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How to properly set FM condenser set points

Published date: 16 May 2019

Issue: FM Condenser Set Points A350 Controller
 
Product line: FM
 
Environment: Data Center Cooling
 
Cause:
 
Resolution:
The OHEs use A350A/B and S350A/B temperature controllers to regulate fan operation. These controllers operate on 24 VAC, and each provides an SPDT relay output. Each controller has a front panel LED that indicates when the relay is energized.
 
Model LNH 1140 rpm Larkin
Condensers
Fan Config.
1×N or 2×N

 
A350 Set
Point
S1 ºC (°F)
S350**
OFFSET S2
(°F)
S350**
OFFSET S3
(°F)
FM35 LNH-S01-A007
LNH-S01-A011
LNH-S02-A017
1 x 1
1 x 2
1 x 2
x
90
100
x
x
x
x
x
x
FM40 LNH-S02-A011
LNH-S02-A017
LNH-S02-A026
1 x 2
1 x 2
1 x 3
87
95
110
x
x
12
x
x
x
FM50 LNH-S02-A011
LNH-S02-A017
LNH-S02-A026
1 x 2
1 x 2
1 x 3
77
90
100
x
x
10
x
x
x

Note:** Larkin wires A350A/B and S350A/B as NC, jumper positions in A350A/B and S350A/B as
heating.

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