IN STAL LA TION IN STRUC TION INSTALLATION INSTRUCTIONS FOR 555621

IN STAL LA TION IN STRUC TION INSTALLATION INSTRUCTIONS FOR 555621
INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
555621
ECONOMIZERS USED WITH R4GM 150/180 UNITS
FORM# 654B-0808 (654B-0905)
Economizers are used with 12 ½ - 15 ton units for automatic sensor-controlled introduction of outdoor air into the system
through an electro-mechanically controlled damper.
ECONOMIZER ASSEMBLY
Step 1:
Check for correct number of parts. See list below.
1 - Economizer Assembly
(Discharge Air Sensor Included)
1 - Barometric Relief Hood Kit
1 - Fresh Air Hood Kit
1 - Hardware Bag
FRESH AIR HOOD KIT
BAROMETRIC RELIEF HOOD KIT
Step 2:
Figure 1
Disconnect all power to unit.
UNIT CONTROL ACCESS
UNIT
Step 3:
Remove the following parts shipped with the air
conditioning unit:
A - Fresh Air Panel
(discard panel but retain screws)
B - Return Air Panel
(discard panel but retain screws)
C - Economizer Access Panel
(located behind filter access)
D - Blower Access
BLOWER ACCESS
FILTER ACCESS
Figure 2
LOCATION OF UNIT 15 PIN PLUG
ABOVE FILTER ASSEMBLY
Step 4:
Set economizer partly in opening in unit.
Step 5:
Remove factory jumper plug. Route economizer
wiring harness up to unit plug and firmly connect it to
unit plug. Secure harness up out of the way of
damper blades as shown in Figure 3.
ECONOMIZER HARNESS
Figure 3
INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
555621
ECONOMIZERS USED WITH R4GM 150/180 UNITS
Step 6:
Take the economizer damper and slide into the
opening. Damper must slide over bottom return
duct opening as shown in Figure 4.
BLOWER ACCESS
Step 7:
Once damper is set in place. Secure damper to unit
with 1 ¼" watertight screws from Step 3.
Step 8:
ECONOMIZER CONTROL
Install the discharge air sensor in the blower
compartment. Mounting holes are located on
blower discharge side panel. Connect two purple
wires located below the mounting holes marked
"mix air sensor". Replace blower access removed
in Step 3.
CONTROL ACCESS
Figure 4
(4)
(3)
(5)
Step 9:
To assemble the Barometric Relief Hood the
following will be needed.
39 ea. - Type A #10 - 16 x ½ Screws
15 ft. - 18 x ½ Gasket
(2)
Follow these steps:
A. Take (1 and 2) put the flange of (1) to the inside
of (2) and screw in place.
B. Take (3) and screw in place like step A.
C. Take (4) and place flanges over (2 and 3) and
secure.
D. Take (5) and slide inside of (2 and 3) and
secure (blade opening into hood).
E. Place gasket on flanges on (1,2, 3 and 4) that
attach to the face of the economizer when
installed.
(1)
Figure 5
20
69 ¾
Step 10:
Install barometric relief hood over lower return
opening on unit using screws provided as shown in
Figure 9.
15 ½
Figure 6
INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
555621
ECONOMIZERS USED WITH R4GM 150/180 UNITS
Step 11:
To assemble the Fresh Air Hood the following will
be needed.
7
6
29 ea. - Type A #10 16 - x ½ Screws
15 ft. - 18 x ½ Gasket
Follow these steps:
A. Take (2) and screw through (1) into (2) using
the Type A screws.
B Take (4) and screw through (3) into (4) using
the Type A screws.
C Take (5) and put to the inside of (1 & 3) and
secure with Type A screws.
D. Take (6) and place flanges over (1 & 3) and
secure with Type A screws.
E. Slide filter in the hood in (2 & 4).
F. Take (7) and secure to (1 & 3) with Type A
screws.
G. Place gasket on the back flanges of (1, 3, 5, 6).
1
8
2
4
5
3
Figure 7
69 ¾
Step 12:
Install fresh air hood over fresh air intake opening
on unit using screws provided as shown in Figure 9.
15 9 16
19 5 8
Figure 8
Step 13:
Replace all access panels and restore power to the
unit.
FRESH AIR HOOD
Step 14:
To ensure watertight operation, small amounts of
caulk may be used on clearance holes, seams, etc.
BAROMETRIC RELIEF HOOD
Figure 9
INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
555621
ECONOMIZERS USED WITH R4GM 150/180 UNITS
Figure 8
OPERATION
A - Cooling Mode
1. On a call for cooling, with ambient temperature and humidity above enthalpy control setpoint, damper will open to
minimum vent position.
2. On a call for cooling, with ambient temperature and humidity suitable for cooling, enthalpy control will shift stage one
control to outside air and shift stage two thermostat to first stage compressor. Damper will modulate to control supply
air temperature at 55° F (13° C). If additional cooling is required, compressor one may be energized through second
stage of thermostat.
B - Heating Mode
1. On a call for heat damper will open to the minimum vent position.
C - Enthalpy Control
The enthalpy control senses both temperature and humidity or the heat content of the outside air. It controls the amount of
outdoor air brought into the system. When the heat content of the outside air is below control setpoint, the control
modulates outdoor dampers to meet cooling needs of the building. When the heat content rises above control setpoint, the
control closes outdoor dampers to minimum position. The recommended setpoint is “A”. If Economizer is allowing air
which is too warm or too humid to enter the system, control may be changed to a lower setpoint (B, C, or D). Refer to Figure
8.
INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
555621
ECONOMIZERS USED WITH R4GM 150/180 UNITS
SYSTEM CHECK
DAMPER ACTUATOR
1. Disconnect main power to unit.
2. Install jumper on auxiliary contacts of blower contactor in
main unit control box.
3. Turn thermostat control to “OFF” position.
4. Install jumper on damper motor terminals T and T1. See
Figure 9.
5. Restore power to unit. Damper should drive to fully opened
position (requires 1 ½ minutes for full travel). Observe travel
for proper damper operation.
6. Disconnect power to unit. Damper should spring return to
closed position.
7. Remove T and T1 jumper on damper motor, then restore
power to unit. Adjust minimum vent position on potentiometer
on damper motor. See Figure 10.
8. Disconnect power to unit and remove jumper on auxiliary
contacts of blower contactor in main unit control box. Restore
power to unit.
MAINTENANCE
1. Damper motor is prelubricated and does not require further
lubrication.
2. Make visual inspection of dampers and linkage assemblies
during routine maintenance.
3. Filters should be checked periodically and cleaned when
necessary.
4. The washable filters supplied with the economizer can be
cleaned with water and a mild detergent.
5. Take note of “Air Flow Direction” marking on filter frame when
reinstalling.
6. If filter must be replaced, filter of like kind and size must be
used. DO NOT replace permanent filters with throwaway
type filters.
Figure 9
MINIMUM POSITION
ENTHALPY CONTROL
SETPOINT ADJUSTMENT
CONTROL MODULE
Figure 10
SUPERSEDES 12-19-07
AUGUST 27, 2008
NEIEC10
COMPONENT CODE
HARNESS DETAIL
E# = WIRE END DESIGNATION
E2 STUD #6 18 Ga. Wire
E3 Female ¼ Quick Disc.
E4 Male ¼ Quick Disc. Insul
E6 Wire Nut Size 73B
HARNESS ENDS AT
(P7) ECONOMIZER
Economizer
C7046C
C7400A
M7215A
P7/S7
TB
W7212A
Mixed Air Sensor
Fresh Air Sensor
Damper Actuator 24V
Plug/Cap Economizer
Terminal Board
Logic Module
Revision
WIRE COLOR CODE
BLK
BRN
ORN
VIO
WHT
Black
Brown
Orange
Violet
White
BLU
GRN
RED
YEL
Blue
Green
Red
Yellow
Change
Date
A
Changed R & C around
06-30-06
B
Changed wiring diagram
12-18-07
CONNECTOR & CONTACT CONFIGURATION
P7 - (303908/303903) PLUG & (303912) PIN
Notes:
1. Unit wiring shown as reference only. Check unit wiring for actual unit wiring.
2. Relays 1K and 2K actuate when the Outdoor Air Enthalpy is higher than the enthalpy set point A-D
on the W7212A Logic Module.
3. 1S is an electronic switch which closes when powered by a 24 VAC input.
4. Factory installed resistor should be removed only if C7400 Differential Enthalpy Sensor is added.
5. Y2 must be energized for Stage 1 compressor to operate during economizer operation.
6. "N" terminal used for occupied mode. Remove jumper when night setback control utilized. 24v
must be applied for occupied mode operation.
Modulating Economizer
R4GM 150-180
Rooftop Systems, Inc.
2405 McIver Lane
Carrollton, Texas 75006
Phone (972) 247-7447
Fax
(972) 243-0940
Date: December 19, 2007
Supercedes: 06-30-06
Drawn by:
Unit # 47-364-10
Diagram# 4736410W
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