Correction Factors - Hisense AHM-044HCDSAA Service Handbook

Capacity and selection data

3.3 Correction factors

3.3.1 Piping length correction factor
The correction factor is based on the equivalent piping length in metres (EL) and the height difference between outdoor unit
and indoor unit in metres (H).
H: Height difference between indoor unit and outdoor unit (m).
- H>0: Outdoor unit is placed higher than indoor unit (m).
- H<0: Outdoor unit is placed lower than indoor unit (m).
L: Actual one-way piping length between indoor unit and outdoor unit (m).
EL: Equivalent one-way piping length between indoor unit and outdoor unit (m).
- One 90º elbow is 0.5 m.
- One 180º bend is 1.5 m.
3.3.2 Correction factor owing to use of glycol (only for Hi-Therma Monobloc)
Application at low ambient temperature
When the ambient temperature is low in winter, the water in the pipes and circulating pump may freeze and damage the pipes
and water pumps during shutdown periods.
To prevent this, it is useful to drain the water from the installation or not to cut off the power supply of the installation, anti-
freezing function will be triggered to prevent freezing.
In addition, in cases where it is difficult to drain the water, it is advisable to use a mixture with antifreeze glycol (ethylene or
propylene at a concentration between 10% and 40%).
Unit performance may be reduced when operating with glycol, depending on the percentage of glycol used, since glycol is
denser than water.
Two tables are shown below (one for ethylene glycol and the other for propylene glycol), indicating the percentage of
ethylene glycol recommended for diverse values of outdoor air inlet temperature, with their respective correction factors.
Corrected heating capacity = capacity correction factor owing to use of glycol × heating capacity
-Ethylene glycol
Ambient Temperature
Percentage of glycol required
Capacity correction factor
Consumed power correction factor
Flow rate correction factor
Pressure loss correction factor
-
Propylene glycol
Ambient Temperature
Percentage of glycol required
Capacity correction factor
Consumed power correction factor
Flow rate correction factor
Pressure loss correction factor
The use of glycol affects to the reading of some parameters like "water flow level" and "capacity" shown through the unit
controller menu. When glycol is used, these data are not correct and must be not used.
DB (° C) 10 7
% 10 10
fgh 1.00 1.00
fgi 0.97 0.98
fgc 1.00 1.00
fgp 0.88 0.92
DB (° C) 10 7
% 10 10
fgh 1.00 1.00
fgi 0.97 0.98
fgc 1.00 1.00
fgp 1.06 1.11
5 2 -3
10 10 10
1.00 1.00 1.00
0.99 1.00 1.01
1.00 1.00 1.01
0.94 0.98 1.03
5 2 -3
10 10 10
1.00 1.00 1.00
0.99 1.00 1.01
1.01 1.01 1.02
1.13 1.18 1.24
26
-7 -13 -22
20 30 40
1.00 0.99 0.99
1.02 1.03 1.04
1.01 1.02 1.04
1.09 1.16 1.26
-7 -13 -22
20 30 40
1.00 0.99 0.99
1.02 1.03 1.04
1.02 1.04 1.07
1.31 1.39 1.51