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Orion Spill-Back Units
The "Orion" high specification twin pump pressurisation unit is ideal for controlling and maintaining pressure in large sealed heating systems. The water in sealed systems expands on heating (increasing pressure) and contracts (reducing pressure) on cooling. The Orion continuously and automatically monitors system pressure and maintains it within set limits. On heating, if pressure reaches the upper limit, the Orion’s pressure control valve ("spill valve") discharges water to a covered atmospheric tank, the "spill tank". Water enters the covered spill tank below surface level. This, and the generally high temperature of the water in the spill tank, tend to minimize oxygen uptake. On cooling, as pressure falls, the unit’s pumps draw water from the spill tank into the sytem to maintain pressure. The Orion also makes up water losses due to the small leaks, maintenance operations, vapour loss from glands etc. that are present in most large systems. Low and high pressure volt free switches allow boiler or chiller safeguarding. A built-in accumulator vessel prevents excessive pump starting. High and low level switches in the spill tank warn of fault situations and protect against pumps running dry.
Scope of Application
"Orion" pressurisation units are available for LTHW and MTHW systems of any size and power.
Maximum pressure up to 10 BarG
Maximum Temperature up to 120ºC
Standard Specification
- Steel "Spill Tank" with lid, internal ladder, level gauge, low level switch, make-up water ball float valve, drain connection, pump connection, spill valve connection, sparge pipe (for system temperatures over 99ºC) and overflow. BS 6281 "A-type" air gap with mesh, tundish & drain connection. Tank protected internally with high duty epoxy finish. Sized for full system expansion
- Twin pumps, each rated at 100% system duty, cascade and auto-change-over operation
- Strainers to protect pumps, spill valve and pressure switches from dirt ingress
- Non-return valves on each pump outlet
- Pressure switches for pumps and spill valve control, high and low pressure warning and cut-outs (adjustable for pressure setting and differential)
- Hydro-pneumatic accumulator vessel, sized to suit system power. For system temperatures over 99ºC a thermal buffer vessel will be provided to protect the accumulator from excessive temperatures
- System pressure control "spill" valve
- Pressure gauge
- Isolation valves for pumps, spill valve, accumulator, pressure switches and system.
- IP 55 Control panel enlosure (see panel specification)
- Wiring between pumps, pressure switches, level switches, spill valve and control panel
- Carbon steel pipework
- Mild steel base (Spill tank separate for ease of positioning
- All steel parts finished externally in a high quality gloss paint
- Pre-delivery testing of all units for soundness, function (on cold water) and electrical safety
- For applications outside the scope of the standard range, for whatever reason, special units can be offered
Standard Control Panel Specification
- IP 55 enclosure with lockable, hinged door
- Door interlocked isolator
- DOL contactor complete with thermal overload protection for each pump
- Circuit breaker protection of control circuit
- Auto / Hand / Off pump control switch
- Pump1 / Pump2 / Auto-Change lead pump select switch
- System reset button
- Fascia mounted indicating lights for :- Power On, high system pressure, low system pressure, pump run, pump trip, low level, spill valve on.
- Alarm circuit mute button (alarm extra)
- Volt free contacts for high system pressure, low system pressure, pump trip, low level
- Pump Auto-change-over with each pump start or pump trip (when auto-change selected)
- Low water pump cut-out (self-resetting)
Options:
- Audible alarm (common for all fault conditions)
- Spill tank fitted onto extended base (rather than separate as standard)
- Single Pump Unit
- Second level switch in spill tank for controlling a make-up water solenoid valve
- "Ball blanket" in spill tank (with cages over outlets) to further reduce oxygen uptake
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Riverside Works • Egmont Street • Mossley • OL5 9NE