Start-Up And Commissioning - Rinnai DO-SC18Z91 Operation & Installation Manual

•
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. Refer to Table 5.
•
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. Refer to Table 5.
•
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
Table 5. R410a Saturated Pressure – Temperature chart
Saturated
Temperature °C
-40
-38
-36
-34
-32
-30
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
-8
-6
Source: (Courtesy Coolpak refrigeration).
Data points are reproduced based on available information. BRIVIS assumes no responsibility or liability for data errors
Brivis

7. START-UP AND COMMISSIONING

Gauge Saturated
Pressure Temperature
kPa °C
79 -4
95 -2
113 0
132 2
152 4
174 6
196 8
221 10
246 12
274 14
303 16
334 18
366 20
400 22
436 24
475 26
515 28
557 30
Gauge
Pressure Temperature
kPa
602
648
697
749
803
859
918
980
1045
1113
1183
1257
1334
1414
1497
1584
1674
1768
49
Saturated Gauge
Pressure
°C kPa
32 1866
34 1968
36 2073
38 2183
40 2297
42 2415
44 2537
46 2664
48 2796
50 2932
52 3073
54 3219
56 3371
58 3527
60 3689
62 3857
64 4031
66 4210
ICE Fixed Speed OIM