Viessmann VITOCAL 350-A Installation And Service Instructions Manual page 20

Installation preparations for heat pumps installed outdoors
Foundations: Type AWHO 351.A
Dim. Vitocal 350-A, type AWHO
351.A10
a mm 1080
b mm 195
Sectional view
B
K E
Fig. 11
Heat pump
A
Concrete foundations (300 mm thick) consisting of:
B
■ Concrete slab C25/30, BSt 500 S and M
■ Reinforcement with all-round Q 257 A wire mesh
KG conduit DN 100 for connecting cables to the
D
heat pump control unit (on site):
Control cable 230 V~, extra low voltage (ELV) lead
< 42 V
Hydraulic connection set (accessories): Hydraulic
E
connection lines for heating water flow and heating
water return
Condensate drain DN 40 (on site)
G
Soft ground, gravel or crushed stone
H
Frost protection (compacted crushed stone, e.g. 0
K
to 32/56 mm); thickness of layer subject to local
requirements and building regulations
Heat pump power cable
M
20
(cont.)
351.A14 351.A20
1230 1400
195 195
A
F
H H
B
K
400 400
M D
E G
Note
■ Before laying the concrete foundations, trim the
hydraulic connection pipes (heating water flow and
return), install the connection fittings and provide
frost protection.
The power cable may be routed freely up through the
■
foundation opening. What is important is spatial sep-
aration between the extra low voltage (ELV) lead and
the control cable.