Viadrus GRAND G 36, Manual For Operation And Installation

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6. Circulation pumps
To the boiler you can order a three-speed circulation pump Grundfos UPS 25-40. The pump operation is
controlled according to electric interconnection of the boiler with selected regulation:
1. Standard boiler design (without regulation) – after having switched on the boiler using the main switch the
circulation pump is running (unless the pump thermostat is connected).
2. Boiler equipped with a programmable regulator Honeywell CM 707 – the pump is controlled by the indoor
thermostat
3. Stack water heater connection - the pump is controlled by the heater thermostat; after its disconnection
the indoor thermostat takes over the control functions.
4. Boiler equipped with equitherm regulator according to regulation A1 - A4 -the pump operation is controlled
according to regulator programme (see. chap. 5.1)
Fig. no. 5 Grundfos UPS 25-40 pump characteristics
7. Stack hot service water heaters
7.1 Technical data of recommended hot service water heaters
Tab. no. 3 Thermal-technical parameters of VIADRUS OV 100 L heater
Heater volume
l 100
Heater heat output (spiral heating wire) kW 23
Heating insertion (heater) heat transfer surface m
2
~ 0,9
Connections: - heating water Js 3/4“
- hot service water Js 1/2“
Heater dimensions: - height mm 886
- width mm 574
- depth mm 587
Weight kg 60
Heating body rated overpressure
kPa
(bar)
400
(4)
Maximum working overpressure for HWS
kPa
(bar)
600
(6)
Adjustment range °C 0 – 90 °C ***)
Time for water heated from 10 °C to 60 °C
(boiler output 26,5 kW and water temperature 85 °C) *)
min 14
Water flow rate (boiler output 26,5 kW) **) l/h 610
Connecting voltage 1/N/PE 230 V AC 50 Hz TN-S
Electric coverage IP 40
Environment normal, according to Č SN 33 2000-1 ed. 2