Heating engineer
28
3
3.2.4.3
Heating distribution
Direct heating distribution with single zone (system with primary water circuit only).
Figure 3.3
Heating distribution 01 - direct
1
GHP immersion temperature probe (standard)
2
radiator
A
connection to K18 unit (GHP plant water temperature probe)
Heating distribution with two zones controlled by 2-way valves (system with primary water circuit only).
Figure 3.4
Heating distribution 02 - system controller with two 2-way zone valves
1
GHP immersion temperature probe (standard)
2
by-pass section with overpressure valve calibrated to
open only when both valves (3) are closed
3
2-way valve
4
radiator
5
system controller (required optional OQLT019)
6
advanced room unit (standard)
7
advanced room unit (available as optional ODSP005) or
basic room unit (available as optional ODSP004)
A
connection to K18 unit (GHP plant water temperature
probe)
B
connection to K18 unit (heating service request). See
system controller manual
C
outdoor temperature probe connection
D
DHW buffer tank immersion temperature probe connec-
tion (if present)
E
DHW/space heating 3-way diverter valve connection (if
present)
2
7
5
6
3
4
B
C
D
E
ST
1
A
Heating distribution with up to two heating circuits, one of which is optionally mixed and one not mixed (system with primary and