0.16
0.51
WC
ON/OFF
UNIT
ZERO
HOLD
P1/P2
HVAC
UNIT
Return Air
from
All Zones
Ultra-Zone
™
Zone Control
Panel
24vac Power
Control Wiring
M
P
Z1
Z2
Z3
0.21
0.51
WC
ON/OFF
UNIT
ZERO
HOLD
P1/P2
HVAC
UNIT
Return Air
from
All Zones
Ultra-Zone
™
Zone Control
Panel
24vac Power
Control Wiring
M
P
Z1
Z2
Z3
P/N 090376A0169 REV. F 03.05.13
Copyright © 2011 EWC Controls Inc., All Rights Reserved.
STEP 2: Place the system
into worst case scenario.
(Smallest zone calling, all other
zones closed).
Force the bypass damper to
The full open position & open
the hand damper as well.
Start closing the bypass hand
damper until the Delta P
value matches the target
value obtained in Step #1.
When finished, lock it down
and place the system back to
normal operation.
STEP 1: Place the system
into single zone scenario.
(All zones are calling and the
bypass is closed).
If
necessary, use the hand
damper to close-off the
bypass completely.
Observe the Total ESP
value at the bottom of the
Manometer or do the math
yourself. Record the value.
That value is now the target
P1 = 0.21
P2 = -0.30
0.21 - (-0.30) =
0.51”wc
Example values
Your values will vary
Example values
Your values will vary
CONTROLS INC.
Excellence Without Compromise
EW
C
CONTROLS INC.
Excellence Without Compromise
EW
C
P1 = 0.16
P2 = -0.35
0.16 - (-0.35) =
0.51”wc
Example values
Your values will vary
Adjust this damper
towards closed
until the Delta P
(ESP) value
matches Step 1.
Force Open
during Step 2
only
Figure 3
Figure 2
P1
ESP
P1
Close for
Step1
Close for
Step1
P2
P1
P2
ESP
P1
