PlantPac Packages by GMSRiverside Works • Egmont Street • Mossley • OL5 9NE
Tel. 01457 835700 • Fax. 01457 832700

PlantPac Packages

PlantPac Packaged Steam Plate Heat Exchangers

  • Instantaneous low temperature hot water/domestic hot water using steam primary
  • With GMS ThermaFlex Plate heat exchanger
  • Built in steam conditioning (with condensate pump option)
  • Accurate microprocessor temperature control
  • Independent high temperature cut-out with manual reset
  • Full function control panel with remote start interlock and volt-free contact
  • Fully packaged and skid mounted ready for connection to system
GMS PlantPac units are fully packaged to simplify system design and installation. The standard range gives outputs up to 1225 kW, with special units available for higher outputs. All necessary temperature control, steam and condensate handling components are built in. Site work is reduced to positioning, connecting up and commissioning.

Heat exchanger: Type ThermaFlex G with AISI 316 stainless steel plates with EPDM gaskets. Robust, compact and easily dismantled (without disturbing pipe-work) for inspection, cleaning or addition of extra plates. GMS ThermaFlex plate heat exchangers are fully described in a separate leaflet.

Steam conditioning: A steam separator and strainers protect components in the steam and condensate lines from liquid or dirt carried in from the steam main. If the steam temperature is above 150°C (3.8 BarG), a pressure reducing valve and steam safety valve will be included to protect the heat exchanger.

Temperature Controller: A digital controller monitors and displays water temperature and operates the control valve, giving accurate temperature control at all outputs.

System interlock: The PlantPac can be remotely started and shut down from an external volt free contact, e.g. in an external pump control circuit to close steam valves when no water is flowing.

Condensate Pump Option: A steam powered pump with inlet and outlet check valves and steam trap to ensure reliable condensate removal under all operating conditions.

Packaging: Fully packaged and mounted on a compact frame ready for installation and connection.

Safety Features: Fail-safe, independent high temperature cut-out valve with manual re-set thermostat and volt-free contact for external alarm. This valve also closes if power (and/or compressed air where applicable) fails. After these are restored the unit re-sets automatically to normal operation.

Specific Features - Domestic Hot Water (DHW) units: 

Standard units heat water from 10°C to 65°C. However flow-rate and inlet temperature can vary greatly depending on demand. This requires fast-acting temperature control to prevent over-temperature conditions. Pneumatically actuated control valves: We offer fast-acting pneumatically actuated control valves for DHW units as standard. These respond almost instantly to sudden changes in demand. We include the necessary air set (filter, regulator) and electro-pneumatic valve positioner. Where a customer does not have a compressed air supply we can include a small, dedicated air compressor for little extra charge.

Electrically actuated control valves: In some DHW applications inlet conditions may be fairly slow-changing. This can be the case if a large buffer storage vessel is built into the DHW circuit. In these cases we may offer electrically actuated control valves.

Shunt Pumps for DHW units: We may offer a bronze shunt pump to circulate water through the heat exchanger. This improves temperature control in low flow conditions. It may not be required if a system already has a pumped secondary return.

Secondary Buffer Vessels for DHW units: We may offer a secondary buffer vessel, complete with loading pump to send water through the heat exchanger. This increases peak output capacity and may allow electrically actuated valves to be used instead of pneumatics.

Specific Features - Low Temperature Hot Water (LTHW) units: 

Standard units heat water from 71°C to 82°C. Flow and inlet temperature conditions are fairly steady.

Electrically actuated control valves: For LTHW units these are standard. Pneumatic valves optional.

Heat Exchanger Bypass: To prevent heat exchanger oversizing, because of the high water flow-rates typical for LTHW systems, we may offer a bypass, with flow regulator valve, to carry some of the water.

Non-Standard Units: PlantPac units can be tailored (in both duty and configuration) to suit particular specifications. Full details of special units will be given at time of quotation

Commissioning: GMS can commission PlantPac units on site (recommended)

For further information, please visit our main website at
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