Summary of Contents for MCDonald POWERflow Series
- Page 1 BESPOKE RANGE OF UNVENTED HOT WATER CYLINDERS Installation & Service Instructions Hot Water Storage Solutions...
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Page 2: Table Of Contents
Issue 4: March 2020 Section Page DESIGN Introduction Storage and Handling Equipment Supplied Mains Cold Water Supply Positioning The Cylinder Schematic Diagram Technical Data INSTALLATION Cold Mains Pipe Work Temperature and Pressure Relief Valve Expansion Vessel Secondary Return Circulation Boiler and Soalr Connection Electric Immersion Heaters and Connections Discharge Pipe Arrangement Wiring Diagram Two 2 Port Valves (S-Plan) -
Page 3: Introduction
All unvented cylinders come with all necessary safety and control devices required to connect to the cold water mains and are compliant with G3 building regulations. All McDonald Water Storage products are manufactured under a ISO9001:2015 Quality Management System. The POWERflow unvented cylinder must be installed and maintained by a competent person as defined by the relevant regulations. -
Page 4: Storage And Handling
The tundish must be positioned so that it is visible to the occupant and is away from electrical devices. STORAGE & HANDLING McDonald Water Storage must be stored in an upright orientation and should be stored in a dry environment. When lifting or carrying the cylinder, please handle with care. Do not use any factory fitted pipe work or connections as these can be damaged. -
Page 5: Equipment Supplied
EQUIPMENT SUPPLIED The POWERflow range comes with all the necessary equipment required to install the cylinders safely to the cold mains. G3 building regulation should always be considered when installing unvented systems. See the table below for components are supplied with the unvented cylinder. Indirect COMPONENT Direct... -
Page 6: Mains Cold Water Supply
MAINS COLD WATER SUPPLY The POWERflow range operates at 2.1 bar (see page 4 for other model settings), which is controlled by the pressure reducing valve. The water demand requirements of a property need to be assessed and care should be made to take into account that hot and cold services are supplied simultaneously from the mains cold water feed. -
Page 7: Schematic Diagram
DIRECT DIRECT SOLAR INDIRECT INDIRECT SOLAR Hot Water Draw Off Boiler Coil Return Secondary Return * Solar Coil Flow T&P Valve Solar Coil Return Dual Thermostat Control Solar High Limit Thermostat Expansion Relief Valve Cold Feed Tundish Drain Immersion Heater Solar Probe Pocket Boiler Coil Flow * Selected models only... -
Page 8: Technical Data
POWERFLOW DIRECT AND DIRECT SOLAR DIRECT DIRECT SOLAR TECHNICAL DATA Direct / Direct Solar Model Size Capacity (Litres) Height (mm) 1150 1350 1550 1550 1850 Diameter (mm) Empty Approximate Weight (KG) Direct Model Full Empty Approximate Weight (KG) Direct Solar Model Full Surface Area Of Solar Coil ( Pressure Loss Across Solar Coil (bar) - Page 9 POWERFLOW INDIRECT AND INDIRECT SOLAR INDIRECT INDIRECT SOLAR TECHNICAL DATA Indirect / Indirect Solar Model Size Capacity (Litres) Height (mm) 1150 1350 1550 1550 1850 Diameter (mm) Empty Approximate Weight (KG) Indirect Model Full Empty Approximate Weight (KG) Indirect Solar Model Full Surface Area Of Boiler Coil ( 0.62...
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Page 10: Installation
Secondary Return Circuit Hot Water Draw Off (180 litre models and larger) Expansion Relief Valve Temperature and Pressure Relief Valve Pump Return Valve Tundish 2 Port Valve Expansion Boiler Flow Vessel Dual Thermostat Pressure Reducing Discharge Pipework Immersion Valve Check Heater (With Strainer) Valve... -
Page 11: Temperature And Pressure Relief Valve
TEMPERATURE AND PRESSURE RELIEF VALVE The temperature and pressure relief valve is set at 900C and 4.5 bar, and the expansion relief valve set at 3.5 bar, should be fitted and connected to the tundish (as shown opposite). Note, the relief valves are only used for relief discharge purposes. No valves should be fitted between the relief valves and the cylinder. -
Page 12: Electric Immersion Heaters And Connections
ELECTRIC IMMERSION HEATERS AND CONNECTIONS Combined Stat Immersion Control EARTH (GREEN/YELLOW) Stat NEUTRAL (BLUE) LIVE (BROWN) Reset Stat Connect the 3kW 11” 240v immersion heaters BSEN 60225/2/73 (with manual reset cut out at 800C) to the power supply and earth them in accordance with the current IEE wiring regulations. -
Page 13: Discharge Pipe Arrangement
DISCHARGE PIPE ARRANGEMENT Position the inlet control group so that the discharge from both safety valves can be joined together via a 15mm end feed Tee. Connect the tundish and route the discharge pipe. The discharge pipe work must be routed in accordance with Part G3 of schedule 1 of the Building Regulations. - Page 14 Note: The discharge will consist of scalding water and steam. Asphalt, roofing felt and non-metallic rainwater goods may be damaged by such discharges Note: D2 pipe from tundish is now allowed to be installed in soil stacks within premises. This activity is not recommended as discharge from T&P may continue for long periods of time.
- Page 15 Worked Example The example below is for a G1/2 temperature relief valve with a discharge pipe (D2) having 4 No. elbows and length of 7m from the tundish to the point of discharge. Maximum resistance allowed for a straight length of 22mm copper discharge pipe (D2) from a G1/2 temperature relief valve is: 9.0m.
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Page 16: Wiring Diagram Two 2 Port Valves (S-Plan)
INDIRECT POWERflow WIRING DIAGRAM WIRING DIAGRAM TWO 2 PORT ZONE VALVE (S-PLAN) DUAL THERMOSTAT WIRING HIGH LIMIT CONTROL 2 PORT (HTG) 2 PORT (DHW) CUTOUT STAT Br G Bl Bl 0 9 10 10 WAY WIRING CENTRE 5A SUPPLY PUMP ROOM STAT PROGRAMMER BOILER... -
Page 17: Commissioning
FILLING THE CYLINDER Before filling please ensure the pressure in the expansion vessel is 2.1 bar, this is the same as the setting of the pressure reducing valve (see page 4 for other model settings). Please check all connections including any which are factory made for tightness such as the immersion heater, temperature and pressure relief valve before filling. -
Page 18: Service The Powerflow Range
SERVICING THE POWERflow RANGE You must be a G3 qualified engineer to service and maintain an unvented domestic hot water cylinder, any spare parts required must be purchased from McDonald Water Storage. Safety devices should not be bypassed under any circumstances. -
Page 19: Troubleshooting
If any component has failed, it should only be substituted with a replacement part from McDonald water Storage. IMMERSION HEATER FAILURE If the immersion heater is not heating the water, there may be an issue with the control thermostat or immersion element itself. -
Page 20: Scale Protection
SCALE PROTECTION The Building Regulations L1A: New dwellings/L1B: Existing dwellings and the requirements set out in the Domestic Heating Compliance Guide specify that “where the mains water hardness exceeds 200ppm provision should be made to treat the feed water to water heaters and the hot water circuit of combination boilers to reduce the rate of accumulation of lime scale”. -
Page 21: Short Parts List
SPARE PARTS LIST Description Stock Code No. 3kW immersion element WUEIH Pressure Reducing Valve (2.1 bar) WUVPR Pressure Reducing Valve (3.0 bar) WUVPR3 Pressure Reducing Valve (1.5 bar) WUVPRC 22mm Check Valve WUVC 15mm Expansion Relief Valve (3 bar) WUVER3 15mm Expansion Relief Valve (3.5 bar) WUVER 15mm Expansion Relief Valve (5 bar) -
Page 22: Product Warranty
Regulations in force at the time of installation. • No factory fitted parts have been removed for unauthorised repair or replacement and the product has not been modified – other than by McDonald Water Storage. • Any replacement parts should be purchased from McDonald Water Storage. - Page 23 As a HWA Charter Member we endeavour to provide consumers quality assurance, product satisfaction, and confidence in McDonald Water Storage, that we will deliver a service beyond just supplying the product. The HWA Charter Statement requires that all members adhere to the following: •...
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Page 24: Commissioning Checklist
COMMISSIONING CHECKLIST Page 24... - Page 25 COMMISSIONING CHECKLIST Page 25...
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Page 26: Service Record
SERVICE RECORD Page 26... - Page 27 SERVICE RECORD Page 27...
- Page 28 1945 - 2020 QUEENSWAY INDUSTRIAL ESTATE | GLENROTHES | FIFE | KY7 5QF T: 01592 611123 | F: 01592 611166 | E: sales@mcdonaldwaterstorage.com www.mcdonaldwaterstorage.com...
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