Install Instructions

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IM-PR 566442 1114 (Design Manual)

4.2.4 Considerations for slabs

Warming Up the Slab

When starting up an in-slab system in heating

mode for the first time, it is best to warm the

thermal mass up slowly to help prevent possible

shock to the slab. In accordance with DIN 4725

section 4, Viega recommends:

• Start warmup after concrete has reached its

final set (curing complete).

• Set supply water temperature to 77°F for the

first three days.

• Increase supply water temperature to the set

point in gradual increments for the next four

days (maximum of a 50°F increase in a period

of 24 hours).

• Slab warmup should follow the concrete

manufacturer’s recommendations.

Testing for excessive moisture

Prior to installing a floor covering on a radiant-

heated slab, ensure that the slab has cured

sufficiently. One easy way to confirm this is through

a polyethylene film test:

Tape a one-foot square of 6 mil clear polyethylene

film to slab, sealing all edges with plastic moisture-

resistant tape. If, after 48 hours, there is no

“clouding” or drops of moisture on the underside

of the film, the slab can be considered dry

enough for finish floor applications. Drying times

vary considerably with location, season, interior

temperature/humidity, etc. Follow the finish flooring

manufacturer’s recommendations.

31. ©CSA Group, B214-12. 2012. “Installation Code for Hydronic Heating Systems” Clause 4.6.2

(CSA B214, Clause 4.6.2)

The installer shall ensure that the system

documentation and manufacturer’s operational

instructions are left near the primary heating

equipment or, if that is not practical, near the main

electrical distribution panel, in order for service

and maintenance personnel to have access to the

documentation and instructions.

NOTES:

(1) Examples of information that should be

provided in the documentation of the system

for hydronic space heating include

(a) a room-by-room heat loss calculation in kW

(Btu/h);

(b) the heat output of the heat-distribution unit

in kW (Btu/h);

°C (°F);

(d) the pipe size in mm (nominal size NPS, in)

and total length of piping in m (ft); and

(e) the system head loss and flow rates in kPa

and L/s (psi and gpm).

(2) Examples of information that should be

provided in the documentation of the system

for radiant heating include

(a) a room-by-room heat loss calculation in

kW (Btu/h);

(b) the floor area in m

(ft

);

(ft

);

(d) the heat output density in W/m’ ((Btu/h)/fi

)

of panel area;

(e) the radiant heating panel supply water

temperature in °C (°F);

(f) the pipe size in mm (nominal size NPS, in),

maximum spacing between the lengths of

piping in mm (in), and total length of piping

in m (ft);

(g) the minimum number of heating loops;

(h) the boiler supply water temperature in °C

(°F);

(i) the auxiliary heat required in kW (Btu/h);

(j) the RSI value in m"K/W (R-value) of the

floor coverings;

(k) the RSI value m’.K/W (R-value) of the

insulation under and at the edges of the

radiant panel;

(I) the outdoor design temperature in °C (°F);

(m) the floor surface temperatures in °C (°F):

and

(n) the system friction loss and flow rate in

kPa and L/s (psi and gpm).

(3) Additional information for documentation of the

system is presented in Figures A.1 and A.2.

(4) Attempts should be made to instruct the

user in the safe and correct operation of the

system.

4.2.5 System documentation and operational instructions