EWAP110~340MBYNN
Packaged air-cooled water chillers
4PW22677-1
Operation manual
18
A
NNEX
I
Thermostat parameters
Inlet water temperature control/Outlet water temperature
control
The figure below shows the thermostat diagram.
The default value and the upper and lower limits of the thermostat
parameters are listed in the table below.
■
If the temperature is below the setpoint, the thermostat control
will check every LOADDOWN TIMER.
According to the deviation to the setpoint, no action, slow load
down (=–3%) or fast load down (=–7%) is required.
■
If the temperature is above the setpoint, the thermostat control
will check every LOADUP TIMER.
According to the deviation to the setpoint, no action, slow load
up (=+3%) or fast load up (=+7%) is required.
A
NNEX
II
Schedule timer example
To come to the schedule above following settings have to be made:
All days assigned to the same group will work according to the
settings of this group.
In this example setting:
■
all Mondays, Tuesdays, Thursdays and Fridays will work
according to the settings in group 1 (
),
■
all Wednesdays will work according to the settings in group 2
(
),
■
all Saturdays and Sundays will work according to the settings in
group 3 (
"
),
■
all holiday days will work according to the settings in the holiday
group (
).
All group settings of groups
,
,
"
,
#
and
work similar as
following example (settings for group 1):
INLET CONTROL
Default value
Lower limit
Upper limit
Step difference - a
(K)
0.8
(a)
(a) can only be modified in the service menu
–
–
Step difference - b
(K)
0.5
–
–
Steplength - c
(K)
0.2
–
–
Loadup timer
(sec)
48
12
300
Loaddown timer
(sec)
24
12
300
Setpoint
(°C)
12.0
7.0
23.0
OUTLET CONTROL
Default value
Lower limit
Upper limit
Step difference - a
(K)
0.8
(a)
(a) can only be modified in the service menu
–
–
Step difference - b
(K)
0.5
–
–
Steplength - c
(K)
0.2
–
–
Loadup timer
(sec)
12
12
300
Loaddown timer
(sec)
12
12
300
Setpoint
(°C)
7.0
4.0
16.0
c
b
c
c
b
c
a/2
a/2
Setpoint
Fast load up
Slow load up
No action
Slow load down
Fast load down
MARCH
MON
TUE
WED
THU
FRI
SAT
SUN
1
G1
2
G1
3
G2
4
G1
5
G1
6
G3
7
G3
8
G1
9
G1
10
G2
11
G1
12
G1
13
G3
14
G3
15
G1
16
G1
17
G2
18
G1
19
G1
20
G3
21
G3
22
G1
23
H
24
H
25
H
26
H
27
H
28
H
29
H
30
G1
31
G2
Screen 1
Screen 2
')
"
"
') % %"
%"%" +%"
%%%%% %%%%
%"%%%% %%%%
14.0
°
C
6
8
12 13
15
18
20
12.0
°
C
Cooling inlet setpoint 1
On
Off
time (h)
') % %"
%$2%% &%
%$2%% %%&%
"%/2%% #&%
') %# %$
#2%% %%&%
."2%% %%&%
$%2%% %%&%