Carnes ADCC Installation Manual
READ AND SAVE THESE INSTRUCTIONS
INSTALLATION, OPERATION & MAINTENANCE MANUAL
FOR
Balance and Calibration of
Pneumatic Controls
Models ADCC and ADCD
DUAL DUCT
CARNES COMPANY 448 S. Main St., P. O. Box 930040, Verona, WI 53593-0040 Phone: (608)845-6411 Fax: (608)845-6470 www.carnes.com
COPYRIGHT © 2010 CARNES COMPANY
ALL RIGHTS RESERVED
SUPERSEDES 20225-C 20225-D, Page 1
FORM 20225-D, Page 2
Model ADCC - With or Without Airflow Mixing
Model ADCD - Constant Volume Airflow
BALANCE AND CALIBRATION OF MODEL ADCC DUAL DUCT UNITS WITH NO AIRFLOW
MIXING CONTROL.
1. For units that require no HOT or COLD airflow mixing, refer to Installation and Operation Manual for Pressure
Independent Controls - Form 18675.
2. Calibration of these units is the same as setting two Single Duct Throttling Units.
1. Determine the following system parameters:
a. Satisfied set point pressure of the pneumatic thermo
stat (P).
b. Set point temperature of the thermostat (T).
c. Sensitivity output of the thermostat (S).
d. Desired temperature mixing range (M).
2. Calculate the reset start point and reset span for both the
hot and cold deck controllers based on system
parameters.
EXAMPLE:
P = 8 psi
T = 72oF
S = 2oF/psi
M = 4oF: (70-74oF)
Based on the desired system parameters the control diagram
can be drawn (see above). Calibration of the reset start point
and reset span can be initiated based on information taken
from the control diagram:
Cold Deck: Reset Start Point = 7 psi
Reset Span = 6 psi
Hot Deck: Reset Start Point = 3 psi
Reset Span = 6 psi
3. Setting the reset start point (if other than 8 psi):
a. Remove the cap on the “G” port of the controller and
connect an accurate 0-30 psi (max.) gauge.
b. Regulate the thermostat pressure to the “T” port of the roller
to the desired start point pressure.
c. Adjust the “Reset Start” on the controller to indicate 0 psi on
the “G” port gauge. Then adjust the “RESET Start” to indicate a pressure slightly higher than 0 psi (i.e. 0.1 psi) to
ensure that this setting is not over-adjusted.
d. Remove the auxiliary gauge from the “G” port and replace
the cap over the “G” port tap.
4. Adjusting the reset span (if other than 5 psi).
a. Remove the cap on the “G” port of the controller and
connect an accurate 0-30 (max.) gauge.
b. Regulate the thermostat pressure to the “T” port of the
controller to 20 psi.
c. Adjust the “Reset Span” on the controller to indicate the
desired span on the “G” port gauge.
d. Remove the auxiliary gauge from the “G” port and replace
the cap over the “G” port tap.
5. Calibration Procedures: Setting maximum and minimum
CFM.
a. Direct Acting Thermostat -- Cold Deck
1. Set zone thermostat call for full heating (0 psi) at the “T”
port of controller.
2. Connect a differential pressure gauge across the
Cold Deck inlet sensor tubes. The green tube is the
total pressure (“HI” signal) and the yellow tube is the
static pressure (“LO” signal).
3. Adjust the “LO stat DP” to the desired minimum cooling
airflow limit. REFER TO CALIBRATION CHART ON
INLET.
4. Set zone thermostat to call for full cooling (20 psi) at the
“T” port of controller.
5. Adjust the “HI stat DP” to the desired maximum cooling
airflow limit. REFER TO CALIBRATION CHART ON
INLET.
b. Direct Acting Thermostat -- Hot Deck
1. Set zone thermostat to call for full heating (0 psi) at the
“T” port of controller.
2. Connect a differential pressure gauge across the Hot
Deck inlet sensor tubes. The green tube is the total
pressure (“HI” signal) and the yellow tube is the static
pressure (“LO” signal).
3. Adjust the “LO stat DP” to the desired maximum cool-
ing airflow limit. REFER TO CALIBRATION CHART ON
INLET.
4. Set zone thermostat to call for full cooling (20 psi) at the
“T” port of controller.
5. Adjust the “HI stat DP” to the desired minimum cooling
airflow limit. REFER TO CALIBRATION CHART ON
INLET.
c. Reverse Acting Thermostat -- Cold Deck
1. Set zone thermostat to call for full cooling (0 psi) at the
“T” port of controller.
2. Connect a differential pressure gauge across the Cold
Deck inlet sensor tubes. The green tube is the total
pressure (“HI” signal) and the yellow tube is the static
pressure (“LO” signal).
3. Adjust the “LO stat DP” to the desired maximum cool-
ing airflow limit. REFER TO CALIBRATION CHART ON
INLET.
4. Set zone thermostat to call for full heating (20 psi) at the
“T” port of controller.
5. Adjust the “HI stat DP” to the desired minimum cooling
airflow limit. REFER TO CALIBRATION CHART ON
INLET.
d. Reverse Acting Thermostat -- Hot Deck
1. Set zone thermostat to call for full cooling (0 psi) at the
“T” port of controller.
2. Connect a differential pressure gauge across the Hot
Deck inlet sensor tubes. The green tube is the total
pressure (“HI” signal) and the yellow tube is the static
pressure (“LO” signal).
3. Adjust the “LO stat DP” to the desired minimum heating
airflow limit. REFER TO CALIBRATION CHART ON
INLET.
4. Set zone thermostat to call for full cooling (20 psi) at the
“T” port of controller.
5. Adjust the “HI stat DP” to the desired maximum heating
airflow limit. REFER TO CALIBRATION CHART ON
INLET.
BALANCE AND CALIBRATION OF MODEL ADCC DUAL DUCT UNITS WITH
ADJUSTABLE AIRFLOW MIXING
CONTROL OPTIONS
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