Page 26 - Towards A Sustainable Future , Phase 3 2025, E-Book_Neat

Objectives The BMS engineer also further shared that suction pressure
The primary objective is to develop a solution to reduce should not fall below 90 psi for R32 air conditioning for more
greenhouse gas emissions for air conditioning products and than 10 minutes. This indicates a low refrigerant pressure
their servicing process. The primary carbon emissions are condition for the air conditioning system and requires the
the refrigerant used in their products, recharging refrigerant technician to check the air conditioning system immediately.
during maintenance and fugitive emission leakages from their Prolonged operation under low suction pressure is adverse to
products. The secondary objective is to develop a solution to the air conditioning system.
minimise the fire risk of the R32 air conditioning system.
Chart 1.4 (below) shows the relationship between insufficient
charge and efficiency and cooling capacity.

Fig 1.2. The Daikin engineering team shares with ITE students

BMS and Daikin shared their products and service procedure
with us (See Figure 1.2). They have stopped selling and installing
the R410A air conditioning system due to regulations that Chart 1.4. Insufficient refrigerant charge chart
reduce the high GWP (Global Warming Potential). Currently, Source: https://www.daikin.com.sg/product-series/vrv-x/
they are focusing on distributing the new R32 air conditioning
system. However, they also highlighted that R32 is an A2L
flammable gas (See Figure 1.3). It has fire risk potential should BMS shared that if the air conditioning is not cold during
there be a leakage in the system. They are also in discussion servicing, the technician will check the refrigerant charge
with SCDF to enhance the safety process in handling R32 air level. If the refrigerant, after being recharged, drops gradually
conditioning. within 1 1-week period, there is leakage in the air conditioning
system. Frequent recharge of the leaking air conditioning
system will not solve the problem. Identifying the issue of
the leakages and rectifying it early will be a more feasible
solution. Leakages can come from several sources, as shown
in Figure 1.5.

Fig 1.3. Advisory label on R32's Daikin Air conditioning

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