Velleman-Kit High-Q K6200 Illustrated Assembly Manual page 8

Suppressor network
10. Assembly of the suppressor network :
C6 : 0,1µF / 400V
Fit capacitor C6 vertically, with only one lead soldered.
In case you want to suppress the NO contact :
Fit R21 (220 ohm 1/2W) also vertically and with only one lead soldered, where after you connect the free
ends of the resistor and the capacitor together (see fig. 2.0).
In case you want to suppress the NC contact :
DON'T fit R21, but R22 (220 ohm 1/2W), in the same way.
REMARK: with small loads it may be necessary to fit a lower value for C6 (e.g. 22nF/400V), because
otherwise the voltage across the load may not drop to zero when the relay is switched off.
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Fig. 2.0