Step 1: Place The System Into Single Zone Scenario.; Step 2: Place The System Into Worst Case Scenario. - EWC Controls ULTRA-ZONE RD-HD Application Note

STEP 1: Place the system
into single zone scenario.
(All zones are calling and the
If
bypass is closed).
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
Return Air
from
All Zones
Close for
Step1
Example values
Your values will vary
P1 = 0.16
P2 = -0.35
0.16 - (-0.35) = 0.51"wc
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.
Return Air
from
All Zones
Adjust this damper
towards closed
until the Delta P
(ESP) value
matches Step 1.
Example values
Your values will vary
P1 = 0.21
P2 = -0.30
0.21 - (-0.30) = 0.51"wc
Example values
Your values will vary
WC
0.16
P1
0.51
ESP
P1/P2 UNIT
HOLD
ZERO
ON/OFF
P2
HVAC
UNIT
Ultra-Zone™
Zone Control
Panel
24vac Power
Control Wiring
WC
0.21
P1
0.51
ESP
P1/P2 UNIT
HOLD
ZERO
ON/OFF
P2
HVAC
UNIT
Ultra-Zone™
Zone Control
Panel 24vac Power
Control Wiring
Figure 2
P1
M P
Close for
Step1
Figure 3
P1
M P
Force Open
during Step 2
only
P/N 090376A0169 REV. F 03.05.13
Copyright © 2011 EWC Controls Inc., All Rights Reserved.
Excellence Without Compromise
EW C
CONTROLS INC.
Z3
Z2
Z1
Excellence Without Compromise
EW C
CONTROLS INC.
Z3
Z2
Z1