Special Mt-Lt Units; Compressor Time Settings - Carel uRack User Manual

4.7 Special M MT-LT units
4.7.1 Managemen nt of compresso
The ha ardware features o of the µRack contr
mediu m installations, ha aving the advanta
speed managed by the speed controller o
Below is an example dia agram:
This ty ype of system can be controlled by
1 1. the compres ssors must have th
2 2. the max num mber of compress
allocated to probe LP1, and th
4.7.2 Probes and values controlle
Function n
Low pr ressure circuit 1
Low pr ressure circuit 2
High p pressure circuit dis scharge
Tempe erature 1
Tempe erature 2
4.8 Compres sor time se
The fo llowing is a list of all the time param
Time b between stop req quests with HP p
Param eter C06 sets a st top delay between
This ap pplies both in the dead band and in
Minim mum compressor ON time
Sets th he minimum time the compressors
R
Cm mp
TMinOn
Fig 4.f
Cod. C CAREL +03P220 0431 rel. 2.2 date
All manuals and user guides at all-guides.com
s
r racks with LT a nd MT circuits a nd condenser on
roller can be adap pted for the contro ol of a special type
ge of being comp pact and offering l low cost solutions
or external pressu re switches, and s separate managem
Flo oating condenser SET
Dou uble circuit
com mpressor unit
Condenser
Liquid re eceiver
µRack in the follo owing conditions:
he SAME CAPACIT TY
sors in the MT uni it and LT unit is 4. . There can theref
he other compres sor rack to probe LP2.
ed
Input
B4 (pressure)
B1 (pressure)
B1 (pressure)
B2 (temperatur re)
B2 (temperatur re)
B3 (temperatur re)
ettings
gement (and not
meters used for co ompressor manag
prevent active
n one compressor r and the next, if th he high pressure
n the proportiona l band.
stay on, that is, o nce activated, mu ust remain on for t
T[s]
T[s]
d 10/02/12
nly.
e of compressor r ack that is becom
s. These are comp ressor racks with
ment of the comp pressors in the MT
µRa ac
Fig 4.e e
fore be combinatio ons of 2+2, 3+1,
C ode on display Type of un
A- Single circ
B- Compress
LP1 A -B
LP2 B
HP A (press – t
B (only tem
B2 A (AUX pro
B (not used
B3 Always pres
capacity contro ol).
prevention (preve ent) function is ac
the time set by th is parameter (par
Ke ey:
R
Comp ressor call
Cm mp Comp ressor
TM MinOn Minim mum ON time
T Time
16
µRack
ming more widely used in small and d
only the condens sing section, and w with fan
T and LT units.
MT display cabinet
group
LT display cabinet
1+1. One compre essor rack will be
nit:
cuit compressor rac k
sor racks with 2 circ uits MT-BT
temp)
mp)
obe)
d)
esent
Tab 4.b T
ctive.
rameter C01).