1. Metering center electrification (instructions for the electrical contractor)

According to the heat agreement, the customer is responsible for ensuring that the room where the metering center is located has a 230 V group line for connecting the heat energy calculator, other devices required for monitoring heat consumption, and a possible differential pressure meter of district heating, as per the heating supplier’s instructions. The customer provides electricity for these devices free of charge to the heating supplier. No other customer devices may be connected to the group line.

The group line is brought to the area next to the heat energy calculator at a height of 1.7 meters from the floor, where the heating supplier will install a maintenance switch.

When the main center is located near the heat distribution room, the meter group line comes from the property’s part of the building. If the heat distribution room is in a separate building, the fuse may be placed in the building’s main electrical panel.

The fuses for the heat energy calculator’s group line and the district heating automation’s group line must be connected to the same phase (e.g., L1), regardless of the fuse’s location.

2. Connection to district heating

It is the responsibility of the customer/contractor to ensure that:

• The pressure difference of the local district heating network is checked. Is the heat distribution center’s control valve properly sized, and is a pressure differential regulator needed in your area?
• The electrical supply and the metering platform (meter base plate ELL 52.01, electrical number 3308175) are ready for the heat energy meter before commissioning district heating.
• The 230 V group line of the heat energy meter is equipped with a sealable 6A fuse. No other consumption devices may be connected to the group line. See instruction 1: Electrification of the metering center.
• The heat distribution room has a floor drain or another drainage system approved by the heating supplier for removing leak water.
• Pressure and temperature gauges and shut-off valves (min. +120 ºC/16 bar) are approved.
• Joints and components are made of forged steel; the use of cast iron parts in the district heating pipeline is prohibited (threaded joints max. ¾ ”).
• Connections for copper district heating pipes are made by brazing and equipped with capillary fittings (90º angle fittings are prohibited).
• Vaasan Sähkö Oy has free access (key) to the heat distribution room for required maintenance and inspection visits to the metering center.

Note! Before commissioning, a test pressure and commissioning inspection must be carried out! (Test pressure: Vaskiluoto, Vanha Vaasa, Runsor, and Sepänkylä 21 bar. Other areas 13 bar.)

3. Construction of the connection line

The connection fee includes the construction of the district heating line, including excavation work, up to the customer’s heat distribution room, and the district heating metering center.

In a new building with a basement, the customer must leave an opening in the concrete structure during the foundation pouring phase for the connection line’s penetration. It is recommended that the customer contact customer service regarding the placement and size of the opening (see contact details above). If the building does not have a basement, a riser elbow should be installed in the foundation before pouring the foundation.

4. Installation of riser elbows

The insulated section of the riser pipe (protective casing) must be at least 50 mm above the finished floor surface. The distance of the protective casing from the wall must be at least 50 mm. The cover depth in the yard must be at least 500 mm.