Belimo ECON-ZIP-BASE - Method of Operation; Sequence of Operation

32
0
6/16 - Subject to change. © Belimo Aircontrols
(
USA
)
, Inc
.
ZIP E
co
n
o
miz
er
Method of O
p
eration
S
e
q
uence of
Op
eratio
n
States
Virgin State
The ZIP Economizer comes shi
pp
ed from the factor
y
in this state. “Setu
p
Incomplete” will be displayed. No control will occur until setup is completed.
A
utomatic State – all of the followin
g
strate
g
ies and operational modes are
a
v
a
il
ab
l
e
in thi
s
s
t
a
t
e.
A
minimum of two pieces of information (in level 2 Settings menu) must be
entered before the ZIP Economizer will go into Automatic State:
•
Th
e a
pp
ro
p
r
i
ate
ZIP
co
d
e must
b
e entere
d
.
• The minimum damper position setpoint (Vent Min Pos) percentage must be
entered.
When in Automatic
S
tate, the
G
input terminal is used to monitor a remote
occupancy contact, time clock and/or indoor fan signal. When the G terminal is
energized, the ZIP Economizer will operate in Occupied (damper will move to
the proper ventilation position).
O
therwise, the ZIP Economizer will operate in
U
noccu
pi
e
d
.
Strategies
Compressor Protection and Ener
g
y Savin
g
s
DXLL
(
S
upply Air Low Temperature Protection in Mechanical
C
ooling
)
This strategy is activated automatically when in Mechanical Cooling Mode
d
epen
di
ng on supp
l
y a
i
r temperature.
Ti
mers, temperature
d
ea
d
b
an
d
s an
d
S
AT Y2 Limit setting all interact with this strategy
.
S
AT < 45°
F
All
compressor stages
di
sa
bl
e
d.
45
°
F

S
AT < 47°F
C
ompressor stages may or may not
b
e ena
bl
e
d
b
ase
d
on w
h
et
h
er or not
S
AT is rising or falling.
S
AT

47°F and
S
AT Y2 Limit=
O
f
f
B
ot
h
compressor stages ena
bl
e
d.
4
7°
F

S
AT < 56.5°F and
S
AT Y2
L
imit=
O
n
1st stage compressor ena
bl
e
d.
2nd sta
g
e compressor disabled
.
S
AT

56.5°F
B
oth compressor stages enabled
.
SAT Y2 Limi
t
This strate
g
y inhibits the 2nd sta
g
e compressor from comin
g
on prematurely
based on SAT tem
p
erature and time.
• IF Y2 is ener
g
ized
AND Compressor 1 has been runnin
g
for less than 4 minute
s
AND
S
upply Air Temp is less than or equal to its required setpoint + 1.5°
(
56.5°F
)
THEN Compressor 2 will not be allowed to come o
n
LCLO (Low Ambient Compressor Lockout)
This strategy inhibits compressor operation at low outdoor air temperatures.
• IF OAT falls below the low limit (50°F)
AND not in Heat Pum
p
Mode
THEN Com
p
ressor 1 and Com
p
ressor 2 will be disabled.
• IF OAT rises 2°F above the low limit
(
52°F
)
OR in Heat Pum
p
Mod
e
THEN
C
ompressor 1 and
C
ompressor 2 will be enabled.
M
inim
u
m
O
n
a
n
d
Minim
u
m
Off
Tim
e
This strategy prevents the compressors
f
rom “short-cycling”.
•
IF any Compressor is ener
g
ized
THEN run it at least 180 seconds EX
C
EPT when entering Brownout Mode
when compressors will be shut o
ff
immediately.
•
IF any Compressor is de-energize
d
THEN keep it o
ff
f
or at least 180 seconds
N
ot Simultaneous ON/Not Simultaneous OFF
O
n RTUs with 2 compressors this strategy is used to prevent both compressors
f
rom coming on at the same instant to keep electrical demand down.
•
C
ompressors 1, 2 are kept from switching on together by a 10 second time
dela
y.
•
If SAT Y2 Limit is set to “On” com
p
ressor 2 is dela
y
ed b
y
240 seconds to
evaluate if the single compressor already operating can bring SAT less than
or equal to setpoint +1.5 °F
(
56.5°F
)
.
•
Compressors 1, 2 are kept from switching off together by a 5 second time
delay EX
C
EPT when entering Brownout when compressors will be shut off
i
mme
di
ate
ly
.
B
rownout Protect
i
on
I
nput power (24 VA
C
) is monitored.
•
IF
i
nput vo
l
tage
d
rops to 75%
AND it stays below there
f
or 30 second
s
THEN
B
r
o
wn
ou
t w
ill
be
e
n
abled.
•
IF input volta
g
e rises to 85%
AND it sta
y
s there for 300 seconds
THEN
B
r
o
wn
ou
t w
ill
be
disabled.
U
nder Brownout conditions the current operating mode will be maintained
EXCEPT Mechanical Coolin
g
and Inte
g
rated Coolin
g
(
where compressors are
u
t
ili
ze
d)
.
I
nstead of Mechanical Coolin
g
it will
g
o to Ventilation, DCV or Unoccupied.
I
nstead of Integrated Cooling it will go to Free Cooling
.
This strategy prevents compressor operation during brownout conditions.
C
ompressors will be turned off immediately (bypassing minimum on/off
t
i
mers
)
.
R
andom On Delay after Power Up
Af
ter a power blackout or any power restore, compressors will go through
a random time delay be
f
ore allowing them to operate. This random timer is
between 30-180 seconds. This hel
p
s the electrical network to come back u
p
without excessive demand
f
rom multiple RTUs and compressors comin
g
back
o
n
a
ft
e
r th
e
b
l
ac
k
ou
t.
F
r
ee
z
e
Pr
o
t
ec
ti
o
n
S
ee Freeze Protection Mode of
O
peration below.