EC3-33x Coldroom Controller with EX5
User Manual
EC3-33x
A.6.5.063E - Rev 4
9
Emerson Electric GmbH & Co - ALCO CONTROLS - Heerstr. 111 - D-71332 Waiblingen - Germany - Tel.: ..49 (0) 7151 509 0 - Fax: 49 (0) 7151 509 200
SENSOR POSITION
The pipe-sensors for measuring the coil inlet and outlet temperature must be fixed with metal clamps or temperature resistant plastic
straps and it is recommended to insulate with ARMAFLEX™. The use of standard electrical plastic straps is not recommended because
they cannot withstand the temperature changes and could become lose with time. This will then cause controller errors due to wrong
temperature measurements.
The recommended position of the pipe sensors is between 9 and 3 o’clock as shown on the picture.
The air sensors must be mounted on spacers in the middle of the air duct so that the air flow around.
The recommended positions in detail :
1. S1 Coil inlet sensor : Position at the first return bend.
2. S2 Coil outlet sensor : Position direct after the evaporator on the common suction line.
3. S3 Air return sensor : In the air duct, in the middle of the cabinet, as high as possible.
4. S4 Air discharge sensor : In the air duct, as high as possible, asymmetric closer to the expansion valve.
5. S5 Fin sensor: On the evaporator, asymmetric closer to the expansion valve.
Caution : For low temperature cases with fans off during defrost, the uses of the fin sensor for defrost termination is highly recommended.
The sensor cables can be extended if necessary. The connections must be protected against water and dust.
EX2
S1
S2
S5
S3
S4
