Robur ACF 60-00 - Hydronic and Gas Installation; Water Piping Design and Installation

Installation, Start-Up, Adjustment and Maintenance Manual
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4. HYDRONIC AND GAS INSTALLATION
4.1 WATER PIPING DESIGN AND INSTALLATION
Piping for the chiller is to be designed and installed as a closed hydronic circuit.
The following items (not supplied) must be installed close to the unit (see Figure 9):
- FLEXIBLE CONNECTIONS to avoid vibration transmission to the chiller water lines.
- MANOMETERS to measure Inlet and Outlet pressure.
- CHILLED WATER FILTER mounted in the water Inlet line to remove debris from the chiller water
lines.
- WATER FLOW RATE VALVE for adjusting proper water flow rate.
- WATER PUMP properly sized for system.
- EXPANSION TANK must be properly sized based on the hydronic system size, maximum thermal
expansion, and maximum water pressure.
- FILL VALVE for filling, draining or flushing the hydronic system.
- AIR BLEED set at the highest point in the hydronic system for removal of air.
To ensure the correct operation of the unit and to avoid the water freezing, add 10% by volume
of mono-ethylene glycol (antifreeze) to the circulation water. Add more mono-ethylene glycol as
needed for the minimum external temperature of the installation zone (see Table 18, page 53).
When using an automatic water charge system, the mono-ethylene glycol percentage must be checked once
a year.
There must be correct chilled water flow when the unit is operating and during the shut down period (600
seconds, between turning the burner off and complete shutdown of the appliance).
Piping (diameters of tubes etc.) must be sized appropriately in order to ensure the correct chilled water flow
necessary for the proper operation of the unit. The water lines should also be sized so the maximum velocity
of the water/mono-ethylene glycol solution in the lines does not exceed 6 feet per second to avoid excessive
noise.
Absorption cooling unit does not require obligatory installation of cold-water storages (because there is no
compressor in the system).
The use of the cold-water storage is anyhow suggested, in order to absorb frequent variations of thermal
load, that reduces the working time of the unit, reduces the energy consumption and consequently saving
money. It is recommended specially when water quantity in the system is lower than 18.5 gallons for each
installed ACF60-00 unit.
WARNING