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OSO 20 RD Installation Manual

Oso water heater installation manual
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PLEASE LEAVE THIS MANUAL WITH THE OSO UNIT AFTER INSTALLATION

INSTALLATION MANUAL

This manual gives detailed advice for installation and should be read carefully
prior to fitting any unvented unit. Where components are supplied only for
indirect units, this is clearly shown.
This OSO cylinder must be installed by a competent person and be installed in
compliance with the OSO Installation and Maintenance Instructions, all current
legislation, codes of practice and regulations governing the installation of
unvented hot water cylinders in force at the date of installation.
Components supplied with the unit for site fitting
(See also page 2 for component list)
Multibloc valve, includes pressure reducing valve, line strainer, balanced cold water take off,
*
(for shower or bidet only) check and expansion valve.
Tundish
*
1/2''F x 15 x 15 tee piece.
*
Flexible hose.
*
3/4'' x 22mm Elbow / Drain Cock.
*
Commissioning valve, 1/2'' BSP male.
*
Motorised valve (indirect only).
*
Components factory fitted
Immersion heater(s).
*
Thermostats / thermal cut-out.
*
Temperature and pressure relief valve.
*

Installation details

The OSO unvented unit is designed for use with supply pressure up to 16 bar. For pressures over
16 bar an additional pressure reducing valve must be fitted in the supply pipe to the unit.
Wall mounting brackets are available for OSO unvented units 100-170 litres capacity.
20S (IM) 16pp ISSUE 8
20 RD
20 RI
Health and Safety
Manual Handling Operations Regulations 1992 defines manual
handling as: "any transporting or supporting of a load (including the
lifting, putting down, pushing, pulling, carrying or moving thereof) by
hand or bodily force". The Regulations set no specific requirements
such as weight limits. However common sense still has to be used
based on an ergonomic approach for each individual.
DIMENSION AND WEIGHTS TABLE 1
100
PRODUCT REF.
HEIGHT
720
DIAMETER
580
34
WEIGHT EMPTY
132
MAX WEIGHT FULL
-1-
IM/5a
125
170
210
250
900
1150
1400
1600
580
580
580
580
40
48
60
64
163
215
261
303
330
2090
580
82
397

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Summary of Contents for OSO 20 RD

  • Page 1: Installation Manual

    MAX WEIGHT FULL Installation details The OSO unvented unit is designed for use with supply pressure up to 16 bar. For pressures over 16 bar an additional pressure reducing valve must be fitted in the supply pipe to the unit.
  • Page 2 General Layout Fig:1 Part No Part No Flexible Hose 202108 Return 3/4'' BSPF Secondary Return 1/2'' BSPF Flow 3/4'' BSPF Fit 1/2''Fx1/2''Mx15mm Tee piece (Not supplied) 510511 Commissioning Valve / Fitting Pressure Reducing Valve 250440 1/2'' MI Drain Cock includes item 4 510505 Elbow / Drain Cock 250445...

  • Page 3: Cold Water Supply

    COLD WATER SUPPLY To obtain the best performance from your OSO unvented system it is advisable to feed the unit with an uninterrupted supply. Locate the water heater in a suitable position to facilitate the installation of the cold water supply, discharge fittings and pipework.

  • Page 4: Safety And Maintenance

    (Turn knob to left.) Draining Switch the electrical power off (important to avoid damage to element). Isolate boiler from OSO unit. Turn off the cold water supply valve. Open hot water tap. Open drain (13). The unit will drain.

  • Page 5: Installation And Servicing Instructions

    Hot water discharge from tundish This indicates a malfunction of a thermal cut-out, operating thermostat or the combined temperature and pressure relief valve. Turn off the electrical supply to the immersion heater and also isolate an indirect unit from the boiler. Contact the installer or competent engineer. INSTALLATION AND SERVICING INSTRUCTIONS Cold water inlet control (Multibloc) See Page 2 Items 3 - 4 This combination consists of a pressure reducing valve with integral strainer, check valve and...

  • Page 6: Maintenance

    MAINTENANCE Annually a competent person should:- · Inspect and clean the line strainer · Re-commission the unit air-gap following the procedure described on page 4 · Check all valves for operation · Complete Benchmark logbook Pressure Reducing Valve Expansion relief cartridge 1.

  • Page 7: Electrical Installation

    To comply with regulations governing the installation of indirect unvented cylinders, a motorised valve must be fitted in the primary flow. Your OSO unit has been supplied with a two port motorised valve, which will act as a positive energy cut-out should the safety cut-out operate. The motorised valve will also control the temperature of the domestic stored water via the cylinder thermostat, which is located in the electrical box.
  • Page 8 S Plan Wiring Layout For Other Boilers Refer To Boiler Manufacturer...
  • Page 9 S Plan System Schematic Automatic by-pass If using a 6-wire 28mm or 1'' BSP V4043H on either circuit the white wire is not needed and must be made electrically safe. Honeywell ST 6400 Mains Programmer 7 day HTG Valve Honeywell V4043H ST 6300 Programmer 24 Hr...
  • Page 10 Y Plan Wiring Layout For Other Boilers Refer To Boiler Manufacturer -10-...
  • Page 11 Y Plan System Schematic Automatic by-pass If using a 6-wire 28mm or 1'' BSP V4043H on either circuit the white wire is not needed and must be made electrically safe. Honeywell ST 6400 Mains Programmer 7 day Honeywell V4073A1039 ST 6300 Programmer 24Hr DHW Valve ST 6300...
  • Page 12 OSO FAULT FINDING GUIDE FAULT POSSIBLE CAUSE REMEDY No water flow from hot taps Mains supply off. Check and open stopcock Strainer blocked. Turn off water supply. Remove strainer and clean. (See Pressure Reducing Valve page 6 Installation Manual) Cold water inlet Pressure...
  • Page 13 OSO FAULT FINDING GUIDE No water flow from hot taps Mains supply off Line strainer Cold water PRV blocked incorrectly fitted Open supply Clear line Check and refit valve strainer as required If problem still persists contact a competent engineer...

  • Page 14: Excessive Hot Water From Taps

    OSO FAULT FINDING GUIDE Hot water from taps is cold D D I I R R E E C C T T I I N N D D I I R R E E C C T T Is the...
  • Page 15 INCREASED VOLUMES AND HIGH PRESSURE OPERATION The capacity of all OSO cylinders can be increased by approximately 20% if the internal hotwater dip pipe supply connection is removed. To accommodate the expansion of secondary water an expansion vessel suitable for potable water must be connected to the cold entry to the cylinder (See fig.

  • Page 16: Secondary Return

    Non Return Valve Circulation Pump Secondary Return Line Balanced cold supply for showers or bidet only All replacement parts must be supplied by OSO HOTWATER (UK) LIMITED. To obtain the address of a local stockist contact: OSO HOTWATER (UK) LTD www.oso-hotwater.com...

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