Seresco CWT Series Installation, Operation And Maintenance Manual page 7

Special Considerations for Equipment, Containing A2L Refrigerant
CAUTION!
Dehumidifier, equipped with compressors, contains A2L (mildly flammable) group refrigerant.
Such equipment placement shall satisfy certain requirements of local and national Codes and Regulations, such as
UL 60335/SCA B52/ASHRAE 15 and others, as applicable.
Review following chapter in detail prior to placement of the equipment to ensure the requirements are met.
To ensure that A2L-containing equipment is safe, multiple mitigation systems and approaches are used; that
includes among others, specific relationship between refrigerant charge of the dehumidifier, ventilation operation
and size of space, conditioned by the dehumidifier, as well as other mitigation means (leak detection system etc.)
Dehumidifier Refrigerant Charge, Conditioned Space and Airflow Relationship
One of the mitigations means is to ensure that airflow, maintained by equipment, and conditioned space are
adequately and mutually sized for proper venting and dilution of the air containing refrigerant (in case of the leak).
Table 2 establishes relationship between refrigerant circuit charge (Mc), total conditioned space area (TAmin), and
the equipment airflow, per respective model/option:
The conditioned room space, served by the dehumidifier must have area not less then TAmin (see Table 2)
•
o To account for building's ground level altitude, TAmin should be adjusted by adjustment factor
(AF): multiply TAmin value from Table 2 by AF value from Table 1.
• Total airflow, established by dehumidifier, must be not less then QminTA
Mc value shows (per UL 60335-2-40) system total refrigerant charge for dehumidifier with single
•
compressor circuit, or largest single circuit charge, for dehumidifier with multiple compressor circuits.
Mc value shown in Table 2 is a max charge of a single compressor module, (regardless of it's
o
capacity) – for details of the equipment composition and operation, refer to further chapters;
• Table 2 values are applicable to all models of this series.
NOTE: Refer to the equipment Operation and Maintenance Manual for the details on the dehumidifier ventilation
operation and other operational aspects!
H , m 0
alt
AF 1.00
H
, m 1800
alt
AF
1.15
December 2024
Attention: Equipment Containing A2L Refrigerant
Table 1. TAmin adjustment factor for building site ground altitude.
200 400 600
1.00 1.00 1.00
2000 2200 2400
1.18 1.1.21 1.25
800 1000
1.02 1.05
2600 2800
1.28 1.32
Table 2. Conditioned Space and Airflow Relationship
Mc, kg Qmin, m3/h
1.7 172
7
1200 1400 1600
1.07 1.10 1.12
3000 3200
1.36 1.40
TAmin, m2
5.2
OMM