Airedale StoreMaster 50kW - 77kW - Manual (Page 46)

STOREMASTER
™
Comfort
46
Comfort Range
Technical Manual : 6678403 V1.3.0_ 02_2013
Installation Data
SPLIT SYSTEM
Connecting Refrigerant Pipework Sizing Guide
Evaporator
Section Condenser
Section Equivalent Pipe Lengths with R410A
In Cooling or Heat Pump Mode
Equivalent Length Liquid Discharge
SM50R-E SM50R-C
0-15m 3/4” 1 1/8”
15-40m 7/8” 1 3/8”
SM77R-E SM77R-C
0-15m 7/8” 1 3/8”
15-40m 7/8” 1 3/8”
SM50RHP-E SM50RHP-C
0-15m 5/8” 1 1/8”
15-40m 5/8” 1 1 /8”
SM77RHP-E SM77RHP-C
0-15m 5/8” 1 1/8”
15-40m 3/4” 1 1/8”
IMPORTANT Liquid Line - The figures quoted are the recommended size for both cooling and heating
mode liquid lines.
Discharge Line - The discharge sizing recommendations quoted are also valid in heating
mode when this line becomes the suction line.
Unit Refrigerant Charge The system refrigerant charge is supplied in the Condensing section and is sufficient for
approximately 5m of interconnecting pipework.
R410A
Pre charge
Amount of system charge required by
Evaporator section
SM50R-C kg 23.8 SM50R-E kg 14.0
SM77R-C kg 27.7 SM77R-E kg 16.8
SM50RHP-C kg 2 x 17.7 SM50RHP-E kg 2 x 11.1
SM77RHP-C kg 2 x 19.0 SM77RHP-E kg 2 x 12.4
IMPORTANT Charges quoted per circuit ie: Cooling units have 1 circuit
Heat Pumps units have 2 circuits
Liquid Line Refrigerant
Charge (kg/m) The condensing section is supplied with the system refrigerant and sufficient for approximately 5m of
interconnecting pipework. For every metre thereafter, the following table indicates the approximate
additional refrigerant required, using R410A and assuming a liquid line temperature of 40°C.
Liquid Line (m) kg/m
3/8” 0.05
1/2” 0.09
5/8” 0.15
3/4” 0.21
7/8” 0.30
1 1/8” 0.53
Example: STM50R
Liquid Line length 15m (- 5m) = 10m
Liquid Line diameter = 3/4”
Addition Refrigerant per metre = 0.21kg
ie: 10 x 0.21 = 2.1kg of additional refrigerant / per circuit.
IMPORTANT The pipe sizes/refrigerant charges quoted are for guidance only. It is the responsibility of
the installing contractor/site engineer to check the pipe sizes/refrigerant charge are correct
for each system installation and application.
Split systems may require additional oil which should be added to the low side of
each compressor.
Design should be in accordance with accepted refrigeration practice to ensure good oil
return to the compressor(s) under all normal operating conditions.