SOLAR UNVENTED WATER HEATERS Installation and Operation Manual Important -This Manual Should Be Left With The Cylinder After Installation
Contents Section Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 3 3 5 5 6 6 8 10 11 12 13 13 14 15 16 Introduction Technical specifications Check list General requirements Primary circuit installation Secondary circuit installation Discharge arrangement Electrical installation Filling and commissioning Servicing and maintenance Fault finding User instructions Warranty Part Numbers Service Record 2
1. Introduction The SCX Solar cylinder is a high quality stainless steel unvented cylinder designed for use with all solar systems to provide hot water from a cold mains water supply of between 3bar and 12bar. Reduced performance is available at lower pressures but the units are not suitable for pressures lower than 1.5bar and flow rate of less than 20 litres per minute. The indirect heat exchange surfaces are designed to provide a rapid heat up time.
2.2 Connection 2.2.1 SOLAR Indirect 2.2.
3. Check List • • • • • • • • • • Cylinder 18 litre Expansion Vessel 25litre Expansion vessel Expansion vessel bracket 22mm Inlet group (Pressure reducing valve, Expansion relief valve, non-return valve, line strainer ½” T/P valve, 7bar/90oC factory fitted 15/22mm Tundish 2 x Twin Thermostat (Indirect cylinders only) Immersion heater 1x 22mm two-port Motorised Valve (Indirect cylinders only) 4. General requirements 4.1.
4.7. Pipework connections – All Pipework connections to the cylinder MUST be made in accordance with Fig 4.1, the secondary return being optional. 4.7.1 4.7.2 4.7.3 The SCX Solar unvented cylinder must be installed by a competent person with appropriate qualifications and registration for the installation of unvented water storage heaters.
tampered with in any way. The valve is pre calibrated to lift at 7bar or 90 degrees centigrade and any attempt to adjust it will invalidate the warranty and could affect the safety performance of the unit. 6.4. Inlet Group – The inlet valve group (consisting of non-return valve; line strainer; pressure reducing valve; and pressure relief valve) should be installed in the cold water supply to the cylinder with the arrow pointing in the direction of water flow in accordance with Fig 4.1.
7. Discharge arrangement. T&P Valve Pressure Relief Valve 15mm 15mm 15mm Tundish 22mm The T&P valve may be discharged vertically into the tundish, with the pressure relief valve T’d in from the side (see Fig 7.1 below). The Tundish must be installed in a position so that it is clearly visible by the user. In addition, the discharge pipe from the Tundish should terminate in a safe place where there is no risk to persons in the vicinity of the discharge, be of metal and: Fig 7.
Warning Notice – The discharge will consist of scalding water and steam. Asphalt, roofing felt and non-metallic rainwater goods may be damaged by such discharges. Typical discharge pipe arrangement. Fig 7.2 Valve outlet size Diameter Min. size of Discharge pipe D1 ½” 15mm ¾” 22mm 1” 28mm Min. size of Discharge pipe D2 from Tundish 22mm 28mm 35mm 28mm 35mm 42mm 35mm 42mm 54mm Max.
8. Electrical installation WARNING: THIS EQUIPMENT MUST BE EARTHED. All electrical wiring must be carried out by a competent person and in accordance with the current I.E.E. Wiring Regulations. The control equipment supplied will ensure that the cylinder functions safely. It is intended that these controls operate in conjunction with other control packages as described in the Solar system installation guide which incorporates a programmable time clock etc. 8.1.
8.3 Two Port Valve-The two port valve should be wired to the twin thermostat as per Figure 8.2 below: 8.3.1 Connect the Live supply to the thermal-cut-out and connect the brown wire of the two-port valve to terminal 2 on the thermostat. Earth and Neutral supplies can be connected directly to the valve. 8.3.2 The orange wire of the two-port valve should be connected to the central heating boiler. 8.3.
9.4 Turn off the mains water supply to the cylinder and drain the system through the drain cock. 9.5 Refill the cylinder with hot taps open and close when water flows freely. 9.6 Manually lift (by rotating the knob) both the expansion relief and the temperature and pressure relief valve for a short period to remove trapped air from behind the valve seating and to prove the correct function of the discharge arrangement. 9.7. Check all joints for leaks and rectify as necessary. 9.8.
10.9. In hard water areas it may be necessary to remove and de-scale the immersion heater element. Replace the gasket each time it is removed. If large amounts of scale is present it may be advisable to fit a water softening device. 10.10. To refill the cylinder, close the drain cock, disconnect the hose, refit the immersion heater with new gasket and close all hot water taps before reopening the stopcock. Allow the cylinder time to fill whilst checking for any leaks.
12.2. The flow temperature of the hot water can be set to your requirements on the immersion heater ideally 60°C. Higher temperatures can cause tripping of the high limit thermostat and introduces more energy loss from the cylinder. 12.3. When a hot tap is turned on there may be a short surge of water, this is quite normal with unvented systems and does not mean there is a fault. 12.4. When you first fill a basin the water may sometimes appear milky.
14 Spare part numbers • Expansion vessel • Expansion vessel bracket • • • • • • T/P valve 7bar 90oC 230mm 15mm to 22mm straight tundish 3kW Immersion heater 22mm Pressure reducing valve kit 22mm 2-port motorised valve Twin Cylinder Thermostat 24litre 18litre 24litre 18litre SC07011 SC07002 SC07004 SC06004 SC070011 or SC070012 SC07015 SC06005 SC06006 For assistance please contact the Dimplex Customer Services Department: Dimplex UK Limited, Millbrook House, Grange Drive, Hedge End, Hampshire, SO30
15. Installation, Commissioning and Service Record CUSTOMER DETAILS NAME ADDRESS TEL No. INSTALLER DETAILS COMPANY NAME ADDRESS DATE TEL No. REGISTRATION No. INSTALLER NAME COMMISSIONING ENGINEER (IF DIFFERENT) COMPANY NAME ADDRESS DATE TEL No. REGISTRATION No. INSTALLER NAME CYLINDER DETAILS MODEL CAPACITY LITRES SERIAL NO.
