GEA Grasso 5 - Page 52

The diagrams overleaf represent the overall fields of application in which the
individual operation limits are taken into account.
General limits and fields of operation
REFRIGERANT
NH
3
Compressor speed n
Grasso V
300(T) .. 600(T)
min.
500 min
-1
for direct drive
600 min
-1
for V-belt drive
Grasso V
700(T) ..
1800(T)
500 min
-1
for direct drive
700 min
-1
for V-belt drive
Grasso V
300(T) .. 600(T)
max.
1500 min
-1
Grasso V
700(T) ..
1800(T)
1200 min
-1
Suction pressure = evaporating
pressure =crankcase pressure
p
o
/t
o
Grasso V min.
0.3 bar(a)
-55 °C
Grasso V
300(T) .. 600(T)
max.
8.5 bar(a)
19 °C
Grasso V
700(T) ..
1800(T)
7.0 bar(a)
13 °C
Suction superheat
delta-t
Grasso V
min. >0 °C
Superheat LP suction Grasso VT
Actual suction temperature
t
a
Grasso V(T) min. -50 °C
Discharge pressure =
condensing pressure
tc = saturated condensing
temperature *
11
*
12
P
s
*
13
/
t
c
Grasso V
300(T) .. 600(T)
max.
26.0 bar(a)
60 °C
Discharge pressure =
condensing pressure *
14
*
15
Grasso V
700(T) ..
1800(T)
24.0 bar(a)
56 °C
Design pressure
PS
s
*
16
Grasso V(T) -
26.5 bar(a)
This pressure deviates from the so
called max. discharge
pressure=condensing pressure
(allowed during operation) as stated
in the table.
10 In practice, it is not so much the individual operation limits as combinations of them that are
decisive for the conditions under which a compressor may operate. To check the various
possibilities in this respect, use should be made of the "fields of application" ).
11 This pressure is also the maximum allowable pre-set value of the HP safety switch.
12 CAUTION!: When adjusting the HP and/or LP safety switch, care should be taken that the pressure
difference Δp=(p
C
-p
o
) never exceeds 26.0 bar(g).
13 “Ps“ is mentioned on type plate of the compressor
14 This pressure is also the maximum allowable pre-set value of the HP safety switch.
15 CAUTION!: When adjusting the HP and/or LP safety switch, care should be taken that the pressure
difference Δp=(p
C
-p
o
) never exceeds 19.0 bar (g).
16 “PSs“ is mentioned on type plate of the compressor (Possibly "Pd" is mentioned for compressors
delivered before 1-Mar-2013)
APPENDIX; Product Information (PI)
GENERAL LIMITS OF OPERATION GRASSO V
0089288_imm_v_english_19
52 07.04.2021