Heat carrier temperature control point RMG CERTIFICATE

Transcription

1 Heat carrier temperature control point RMG CERTIFICATE

2 Purpose of temperature control point RMG3T: For adjustment of temperature of heat carrier (together with other automation elements) supplied to various heating devices. Diagram and dimensions of temperature control point RMG3: 450 ± 5mm 210± 5mm To/from heating station or boiler house boiler Heating unit 750± 5mm Points A, B, C, D indicate the boundaries of the point RMG3. Components of supplied RMG3: 1-globe valve; 2-flow control valve; 3-non return valve; 4-coarse cleaning filter; 5-three way control valve; 6-circulator pump; 7-pressure gauge with three way valve; 8-thermometer. RMG3 range: Item No. Product name 3-way valve type Siemens Recommended electric drive for 3-way valve Circulator pump type Connection diameter, mm 1 RMG VXP SSB UPBasic RMG VXP SSB UPBasic RMG VXP SSB UPBasic RMG VXP SSB UPBasic RMG VXP SSB UPBasic RMG VXP SSB UPBasic RMG VXP SSB UPBasic RMG VXP SSB UPBasic RMG VXP SSB UPS RMG VXP SSB UPBasic RMG VXP SSB UPBasic RMG VXP SSB UPS RMG VXP SSC UPBasic RMG VXP SSC UPS

3 Description: -RMG maximum lifting height of pump, m. H 2 O three way control valve k vs, m 3 /h number of ways of valve in use Transportation, mounting and operation conditions: - transported only in factory package; - during transportation protect from moisture, shocks and strong vibration; - RMG3 is mounted indoors to protect from direct weather impact; - RMG3 is mounted at the minimum possible distance to the heating unit; - should be connected to inlet piping and heater using dismountable connectors; - ambient temperature C; - heat carrier temperature C; - maximum working pressure of heat carrier 10bar; - electric wires should not touch the piping and elements of RMG3; - flow control (balance) valve should be opened so that the heat carrier temperature in point A would not fall more than 10 C in respect of the set temperature (in the heat source of ventilation circuit: heating station, boiler house...); - installation, test and start up works for RMG3 unit should be performed only by qualified personnel; - heat carrier should be free of mechanic impurities and chemically not aggressive towards components of RMG3 (bronze, brass, cast iron); - speed of circulator pump is controlled by the switch on the pump; - control point RMG3 is tested with 6bar pressurized air; - maximum values for quality of water: total amount of chlorine and sulphur ions 50mg/l; oxygen 0.1mg/l; water acidity (ph) 8 9.5; total hardness 4 mval/l (200mgCaCO 3 /dm 3 ). Technical characteristics of main components of RMG3 1 Three way valve VXP45: (More info: Figure 1.1

4 1.2 Throughput characteristics of valves: Example of valve selection: (1) =0.083l/s (2) p v100 =9kPa

5 (3) required valve k vs =1m 3 /h 2 Electric drive for three way valve (optional delivery): (More information: Figure 2.1 Electric drive SSB/SSC Allowed pressure drops Valve type Δp max, kpa Δp s, kpa SSB SSC SSB SSC VXP VXP VXP VXP VXP here: Δp max maximum allowed pressure drop at which temperature is controlled; Δp s - maximum allowed pressure drop at which valve can be closed. 2.3 Characteristics of electric drives Supply Control Drive type Opening/closing time Force, N voltage signal SSC/SSB31 AC230 V 3 positions 150s 300/200 SSC/SSB81 AC24 V SSC/SSB61 AC24 V DC V 30/75s 300/200 3 Circulator pump: (More information: UPBasic 25-4(6), UPS 25-80

6 3.1 Technical data: Manufacturer- Grundfos Purpose- for the use in heat supply, heating, ventilation and air condition systems of various objects. Technical data: Type: UPBasic, UPS 100 series (supplied with connectors). Mounting length, mm: 180. Connection diameter: DN25. Insulation class (IEC 85) F. Maximum ambient temperature 40 C at heat carrier temperature of 80 C. Heat carrier temperature C. Supply voltage AV 230V/50Hz. Stainless steel rotor chamber and bearing plate. Corrosion resistant working wheel, composite, PES/PP. Pump casing material cast iron. 3.2 Power of electric pumps: Number of Power/current Power/current Power/current Pump type speed positions (1st speed), W/A (2nd speed), W/A (3rd speed), W/A UPBasic / /0.2 - UPBasic / /0.3 - UPS / / / Operation conditions: -Pump is of sealed rotor type, i.e. pump and engine make one unit without shaft seal. Bearings are lubricated by pumped fluid so the air must be removed from the pump after every filling of a pump; -filter must be mounted before the pump (along the direction of heat carrier flow) (in this case filter is common for entire control point); -the shaft of electric motor of the pump must be mounted only horizontally; -minimum pressure at the pump inlet must be maintained to avoid cavity noise and damage of pump bearings (bushes) at high temperatures: Fluid temperature, C Inlet pressure, kpa 85 C 95 C 110 C note that pump hydraulic characteristics change upon the change of fluid viscosity and density. E.g., when pumping 50% glycol at 20 C temperature, values of pump hydraulic characteristics decrease approximately by 15%.

7 3.4 Characteristics of efficiency and pressure of circular pumps: 331

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9 3 Pressure gauge with three way valve: -pressure gauge accuracy class 1.6; -scale diameter 63mm; -valve with possibility to check zero position of pressure gauge. 5 Thermometer: - accuracy class 1.6; - value of one grade 1 C; - scale diameter 63mm. 6 Filter: -casing material bronze; -filter mesh material stainless steel; -diameter of mesh eye 1mm.