'10 • HM-T-149A
Installation
33
Connection of external heat source
Connect an external heat source such as gas or oil boiler to
(XL8) (in) and (XL9) (out) on indoor unit. To use these
connections, the corresponding “Punchout” parts in the outer
panel must be removed. Also cut off the insulation above the
connections.
For external heat sources controlled by the indoor unit,
temperature sensor BT19 should be replaced to the position
BT24 in order to control the inlet water temperature
appropriately.
For the ones controlled independently, temperature sensor of it
should be placed on BT24 to manage the water temperature.
For details, see page 118 to 121
of '10
・
HM-T-149
<HMA100V, HMA100VM>
<HMS140V>
HMS140V doen’t have a port to connect external heat source but
MT300 and MT500 have it.
(Tapered thread, R1)
(Tapered thread, R1)
MT300
1880
30～45
(adjustable)
600
599
505050 250
308100
XL8
XL9
XL3
XL4
XL24
XL23
Symbol contents
XL3 Cold water R1 ext.
1
XL4 Hot water R1 ext.
1
XL8 External heat source in G1 int
XL9 External heat source out G1 int
XL23 Circulation supply R1 ext.
1
XL24 Circulation return R1 ext.
1
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