Step 9 - Install All Accessories - Bryant 551A Installation, Start-Up And Service Instructions Manual

H. Ventilation Air (Minimum Position Set Up)
If ventilation air is not required, skip this section. If ventila-
tion air is required, perform the following:
1. The indoor fan must be on to set the ventilation air.
Either put the thermostat in the continuous fan mode
or jumper the R and G terminals at the rooftop unit
connection board.
2. Locate the minimum position (MIN POS) potentiome-
ter. Turn the potentiometer full CCW to fully close
the outdoor air dampers. Turn the potentiometer
gradually clockwise (CW) to the desired position. See
Fig. 16.
3. Replace the filter access panel. See Fig. 18. Ensure
the filter access panel is securely engaged.
4. Calculate the minimum
EconoMi$er.
a. Calculate % of outside air using the following
formula.
% Outdoor air through EconoMi$er
% Outdoor
=
air
Outdoor Air Enthalpy
CROUTENT001A00
Tan
OAT Violet
COM W hite
OAH
Red
+15V
Tan
RAT
Violet
COM
W hite
RAH
Red
+15V
CO (+)
2
CO
2
COM
DAT
COM
REM
POT
COM
LED
COM
airflow across
Mixture Temp – Return Air Temp
Outdoor Temp – Return Air Temp
T
O
C
U
O
T T
M PW
Remote
Minimum Position
1k ohm Potentiometer
20 mA LED
Remote
LED
Field-supplied W iring
Fig. 24 — Typical EconoMi$er Sensor Wiring
b. Multiply total CFM by percentage outdoor air,
this gives outdoor air volume in CFM.
WARNING:
injury by keeping fingers away from damper blades.
IX. STEP 9 — INSTALL ALL ACCESSORIES
After all the factory-installed options have been adjusted,
install all field-installed accessories. Refer to the accessory
installation instructions included with each accessory.
A. Motormaster® I Control Installation (551A155 and 180
Only)
Install Field-Fabricated Wind Baffles
Wind baffles must be field-fabricated for all units to ensure
proper cooling cycle operation at low ambient temperatures.
the
See Fig. 25 for baffle details. Use 20-gage, galvanized sheet
metal, or similar corrosion-resistant metal for baffles. Use
field-supplied screws to attach baffles to unit. Screws should
1
be / -in. diameter and
4
for mounting baffles.
CAUTION:
and electrical components, use recommended screw sizes
only. Use care when drilling holes.
Unoccupied Control
(Part number on the control
must be AD-DME1701-1
or AD-DME1711-1.)
Unoccupied
Contact
470 ohm
Resistor
Violet
24 VAC must be present
on BI for the system to be
unoccupied.
Return Air Enthalpy
CRRETENT001A00
Violet
T
O
CO2 Sensors:
C
U
O
T T
M PW
CRCDXSEN004A00
W iring Included
— 15 —
Personal Injury Hazard. Avoid possible
5
/ -in. long. Drill required screw holes
8
To avoid damage to the refrigerant coils
5 watt
2 to 10 VDC at
0 to 2000 ppm
Line
Voltage