7.0 Start-Up and Commissioning
• Ensure that a Return Air Filter is fitted prior to fan start up
• Measure and record the system details as noted under PRELIMINARY SYSTEM INFORMATION and check all
items as noted under PRE START-UP on the Commissioning Sheet provided
• Switch the unit on in cooling mode with the thermostat set to minimum temperature set point
• Measure and record all items as noted under OPERATION CHARACTERISTICS on the Commissioning Sheet
provided
• Check suction and liquid pressures
• Care must be taken to charge the system correctly. Undercharge will result in lack of capacity and the unit may
lock out on its LP (Low Pressure) safety switch. Overcharge will result in high head pressures whilst unit is
operating
• Measure the compressor suction pressure and convert to a compressor saturated suction temperature (CSST)
using R410a refrigerant pressure/temperature table
• Measure the suction line temperature (SLT) approximately 100mm before the compressor
• Calculate the superheat (SH) = SLT – CSST
• Measure the compressor discharge pressure and convert to a condensing temperature (CT) using R410a
refrigerant pressure / temperature table
• Measure the liquid line temperature (LLT) between the outdoor coil and indoor unit throttling device in cooling
mode
• Calculate the sub-cooling (SC) = CT – LLT
• Measure the outdoor ambient air temperature
• Measure the indoor return and supply air dry bulb temperatures, both before and after the indoor coil
• Measure the indoor air quantity ensuring it falls within the Indoor Coil’s limits
• Adjust the fan speed to suit the static pressure and air quantity requirements
• Allow system pressure to stabilise for a minimum of 20 minutes
• Instruct the customer on system capability and correct operation
• Please ask the customer to fill in the CUSTOMER DETAILS section and to register their product warranty with
Brivis
R410a Pressure-Temperature chart
Saturated
Temperature
°C
Gauge
Pressure
kPa
Saturated
Temperature
°C
Gauge
Pressure
kPa
Saturated
Temperature
°C
Gauge
Pressure
kPa
-40 79 -4 602 32 1866
-38 95 -2 648 34 1968
-36 113 0 697 36 2073
-34 132 2 749 38 2183
-32 152 4 803 40 2297
-30 174 6 859 42 2415
-28 196 8 918 44 2537
-26 221 10 980 46 2664
-24 246 12 1045 48 2796
-22 274 14 1113 50 2932
-20 303 16 1183 52 3073
-18 334 18 1257 54 3219
-16 366 20 1334 56 3371
-14 400 22 1414 58 3527
-12 436 24 1497 60 3689
-10 475 26 1584 62 3857
-8 515 28 1674 64 4031
-6 557 30 1768 66 4210
Table 5– Saturated Pressure-Temperature R410a
FAILURE TO COMPLETE PROPER START UP AND COMMISSIONING MAY VOID BRIVIS PRODUCT WARRANTY
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