Daikin Altherma HT Service Manual

ESIE09-08B Piping Diagrams
Appendix 221
Legend
Part number Major Function
R3T Subcool calculation.
R4T Used to control and protect the water system.
R5T Used to control and protect the water system.
R6T
Used to detect discharge pipe temperature, make the temperature protection co
ntrol of
compressor, and others.
R7T Subcool calculation.
S1PH
In order to prevent the increase of high pressure when a malfunction occurs, this sw
itch is
a
ctivated at high pressure of 3.8 MPa or more to stop the compressor operation.
B1PL Used to detect low pressure.
B1PH Used to detect high pressure.
K1E Used to regulate the refrigerant flow of R-410A.
K2E Used to regulate the refrigerant flow of R-134a.
Y1R
Used to switch the operation mode between heating and defrost. Not activated during
heating
(opposite concerning outdoor unit).
K1S Used to switch over between space heating and domestic hot water.
Q2L Used to protect the water system against high temperatures.
M1C
Inverter compressor is operated on frequencies between 40 Hz and 210 Hz by using the
inverter. Max. of 30 steps.
M1P Used to regulate water flow to achieve a constant ∆T.

Daikin Altherma HT Specifications

General

Type	Air-to-water heat pump
Refrigerant	R-410A
Water Outlet Temperature	Up to 80°C
Operating Temperature Range	-20°C to 35°C
Power Supply	3-phase, 400V
Energy Efficiency Class (Heating)	A++