andrews COMBIflo 100/300, Installation, Operation And Maintenance Manual

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ANDREWS COMBIfl o 22 GB
After cleaning and fl ushing of the system, it should be fi lled with an appropriate inhibitor or antifreeze treatment
to maintain water quality levels. The following system treatments have been tested and are recommended for
use with this appliance:
4.4.3 RECOMMENDED HEATING PUMP - MINIMUM FLOW REQUIREMENTS
The following minimum fl ow rates are recommended for use with the COMBIfl o 100 & 150 models :
Heating Load (kW) Min fl ow rate (ltrs/hr) Heating load (kW) Min fl ow rate (ltrs/hr)
10 429 90 3,861
20 858 100 4,290
30 1,287 COMBIfl o 150 only
40 1,716 110 4,719
50 2,145 120 5,148
60 2,574 130 5,577
70 3,003 140 6,006
80 3,432 150 6,435
4.5 WATER CONNECTIONS
The cold water inlet and hot water outlet connection nipples are identifi ed on top of the appliance. Connect the
cold water feed and hot water outlet to these nipples with union adaptors for ease of servicing. Connect the
supplied isolating valve to the drain connection and pipe to a suitable discharge point.
(See 3.1 for connection
locations)
Do not apply excessive torque to these nipples when making connections. The use of an
appropriate potable water pipe sealing compound is recommended.
4.5.1 COLD WATER SUPPLY - SYSTEM
The appliance may be connected to an open vent or sealed system supply. When connected to a sealed sys-
tem an unvented water kit must be installed with a minimum water pressure of one bar. This appliance is factory
fi tted with temperature and pressure relief valves. An unvented system must be fi tted by an approved installer.
4.5.2 COLD WATER SUPPLY - QUALITY AND TREATMENT
In hard water areas scale formation can occur in all hot water systems and the higher the volume and hotter
the water used, the greater and more problematic the scale build-up can be. Water treatment is usually recom-
mended when the hardness levels measures greater than 150 ppm. For this reason,
base exchange water
treatment is strongly recommended in hard water areas.
FERNOX SENTINEL
Inhibitors Protector/
Alphi 11
X100, X500
Noise reducer X200
Universal cleaner Restorer X300
Sludge remover Protector,
Restorer
X400
Antifreeze Alphi 11 X500