Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-80173
Printed in U.S.A.
Form 48/50PG-4SI
Pg 1
10-04
Replaces: New
Book 1
1
4
4
Tab
1a 1b 6a 6b
Installation Instructions
Part Numbers: CRTWOPOS007A00, CRTWOPOS008A00
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precau-
tions in the literature, tags and labels attached to the unit, and
other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
GENERAL
The accessory two-position damper is designed for use on
units without economizers.
The two-position damper accessory allows the unit to
control the outside-air dampers by opening the dampers
whenever the indoor fan is operating and closing the dampers
when the indoor fan is off. There is no modulation associated
with the two-position damper assembly.
PACKAGE USAGE
PACKAGE CONTENTS
INSTALLATION
To install the two-position damper, perform the following:
1. Make sure power supply is turned off and lockout tag is
installed.
2. Unscrew and remove the front cover panel on the return
end of the unit to expose the return section of the unit. See
Fig. 1. Discard panel and save screws.
3. Install the bottom panel over the return air compartment.
Use screws saved from Step 2. See Fig. 1.
4. Connect the plug from the two-position damper actuator
to the 6-pin economizer/two-position damper plug in the
return air compartment of the unit. See Fig. 1 and 2.
5. Adjust two-position damper to desired setting. Two-
position damper performance is shown in Fig. 3 and 4. To
adjust damper, locate the adjustable stop on the actuator.
Loosen but do not remove the screw. Align pointer with
desired setting based on the return duct static pressure and
airflow. Tighten screw.
6. Install the top panel assembly over the top section of the
return air compartment. The top panel assembly should
overlap the bottom panel installed in Step 3. Use screws
provided. See Fig. 1.
7. Remove lockout tag and restore power to unit.
IMPORTANT: Read these instructions completely before
attempting to install the accessory two-position damper.
UNIT
48/50PG
PART NUMBER
SHIPPING
WEIGHT (lb)
03-07
CRTWOPOS007A00
65
08-14
CRTWOPOS008A00
85
QTY
CONTENTS
1
Hardware Bag
1
Bottom Panel
1
Top Panel/Damper Assembly
Turn off unit power and lockout. Electrical shock and per-
sonal injury could result.
Cover the duct opening as a precaution so objects cannot
fall into the return duct opening.
48/50PG03-14
Single-Package Rooftop Units
Two-Position Damper Accessory
