Protecting The Unit From Frost - RHOSS H57603 Instrucciones De Uso

II.3.1.6 Checks to be made w hile the machine is running
(*) Intervention test:
use the s ys tem water intercept
val ves to reduce the flow to the
evaporator.
(*) Intervention test
use the unit water i ntercept
val ves to reduce the flow to the
condens er.
(*) Intervention test:
use the s ys tem water intercept
val ves to reduce the flow to the
evaporator.
II.4

Protecting the Unit from Frost

IMPORTANT !
If the unit is not used during the winter period, the
water contained in the system may freez e.
II.4.1.1 Protection of the unit from freezing w ith the
machine running
In this case, it is the micropr ocessor c ontrol board that prevents
freezing of the heat exc hanger.
When the s et is reached, the anti-freez e alarm i nter venes that stops the
mac hine, while the pump will continue to function regularly.
Project air temper ature in °C
% glycol in weight
Freezing temperature in °C
fc G
fc ¨pw
fc QF
fc P
fc G
fc ¨pw
fc QF
fc P
Ask all unauthorised personnel to leave
¨
Is the water differenti al press ure s witch
¨
Does the high press ure s witch
¨
Does the low pressur e s witch inter vene
Is the wor king press ure reading
If you take the pressur e on the high
pressure si de to appr ox. 8 bar, are
there gas leaks of > 3 grams/year?
(according to EN 378-2).
Does the unit display feature any
Start-up procedure completed !
= Correction factor of the evaporator glyc oled water flow rate.
= Correction factor of the evaporator pr essure drop.
= Cooling capacity correction factor.
= Correction factor of the total absorbed electric power.
START
ª
the area.
ª
YES
activated c orrectly?
ª
YES
inter vene regularl y?
ª
YES
regularly?
ª
YES
correct?
ª
YES
ª
NO
alarms?
ª
NO
The us e of ethylene gl ycol is rec ommended if you do not wish to drain
the water from the hydraulic s ystem during the winter stoppage, or if the
unit has to s uppl y c hilled water at temperatures l ower than 5°C (the las t
case not c onsi dered is inherent the s ys tem di mensioni ng of the unit).
Mixing with glycol modifies the physical features of the water and
consequentl y the performanc e of the unit. T able "A" shows the
multipliers whic h allow the changes in performanc e of the units to be
determined in proportion to the required percentage of ethylene gl ycol.
The multipliers refer to the following conditions: condens er air input
temperature 35°C; chilled water temperature 7°C; temperature
differential at the evaporator 5°C (the s ame c oefficients can be us ed for
different wor k c onditions, as the size of their variati on c an be ignored).
2 0 -3
10 15 20
-5 -7 -10
1,025 1,039 1,054
1,085 1,128 1,191
0,975 0,967 0,963
0,993 0,991 0,990
70
SECTION II: INST ALL ATION AND MAINTEN ANCE
¨ ¨
Chec k and/or repl ace the
NO
component.
¨ ¨
Chec k and/or repl ace the
NO
component.
¨ ¨
Chec k and/or repl ace the
NO
component.
¨ ¨
Stop the unit and chec k the
NO
cause of this anomaly.
¨ ¨
Stop the unit and chec k the
YES
cause of the leak.
¨ ¨
Chec k the c aus e of the
YES
alarm
-6 -10 -15
25 30 35
-13 -16 -20
1,072 1,093
1,116
1,255 1,319
1,383
0,956 0,948 0,944
0,988 0,986 0,983
(*) according to EN 378-2
-20
40
-25
1,140
1,468
0,937
0,981