Nortek B6BW Series, Installation Instructions Manual

Page: 10 / 20

10
CAUTION:
To avoid personal injury or property damage,
make sure the motor leads do not come into
contact with any uninsulated metal components
of the unit.
For optimum system performance and comfort, it may be
necessary to change the factory set speed. See Table 8
(page 14) for airflow data.
1. Disconnect all electrical power to the unit and remove
the upper door.
• For 1.5-2.5 ton Units
a. Remove the black and red wires from the blower
motor jumping terminal. Discard the blower motor
jumping terminal
b.) Connect the heating speed wire (red) and the
cooling speed wire (black) to the desired blower
speed marked on the terminal block of the blower
motor. All airflow data is listed in Table 7 (page
14) .
Minimum Heating Speed:
018 ..................... Low Speed
019 & 024 ......... High Speed
030 ..................... Medium Speed
Standard 2 Speed Motors (018, 019, & 024):
Terminal 4 .......... Hi speed
Terminal 5 .......... Low speed
Terminal 6 .......... Not Used
Standard 3 Speed Motors (030):
Terminal 4 ......... Hi speed
Terminal 5 ......... Medium speed
Terminal 6 ......... Low speed
• For 3 ton Units
a.) Modify dip switch settings for heating and cooling
from Table 3 to match required airflow speeds. All
airflow data can be found in Table 7 (page 14) .
Minimum Heating Speed:
036 ..................... Medium Speed
2. Replace the upper door and secure it to the unit.
3. Restore power to the unit.
SET
HEAT COOL
5 4 3 2 1 1 2 3 4 5
M1 = Low speed Off Off Off Off On On Off Off Off Off
M2 = Med. Low Sp. Off Off Off On Off Off On Off Off Off
M3 = Med. Sp. Off Off On Off Off Off Off On Off Off
M4 = Med. HI Sp. Off On Off Off Off Off Off Off On Off
M5 = Hi Sp. On Off Off Off Off Off Off Off Off On
Table 3. DIP Switch Setting
STARTUP & ADJUSTMENTS
WARNING:
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard 1 Slight Hazard
1
0
0
The evaporator coil is shipped from the factory
with a nitrogen charge. Use caution when
preparing coils for field connections. If repairs
make it necessary for evacuation and charging,
it should only be attempted by qualified,
trained personnel thoroughly familiar with this
equipment. Some local codes require licensed
installation service personnel to service this
type of equipment. Under no circumstances
should the equipment owner attempt to install
and/or service this equipment. Failure to comply
with this warning could result in equipment
damage, personal injury, or death.
Before You Start the Unit
Prior to start-up, complete the following inspections:
√
Verify the unit is level and mounted securely to the
wall. Also make sure the air handler is properly located
with adequate clearances for servicing the unit as
listed in Table 1 (page 4) .
√
Check condensate drain line(s) for proper drainage.
√
Verify the surrounding area and top of the unit is free
from obstructions and debris.
√
Check all duct connections. Make sure the duct work
is adequately sealed to prevent air leakage.
√
Check all coil connections for leaks.
√
Verify that the line voltage power leads are securely
connected and the unit is properly grounded.
√
Verify the thermostat is wired correctly. Make sure
all low voltage wires are securely connected to the
correct leads of the low voltage terminal strip.
√
Verify the power supply branch circuit overcurrent
protection is sized properly.
√
Verify filter is properly and securely installed.
IMPORTANT NOTE:
Before starting the unit, perform the following
procedures to install the initial charge (on units that
are factory shipped with a nitrogen holding charge):
1. Read all installation instructions first.
2. Purge the nitrogen holding charge.
3. Evacuate the unit to 350 - 500 microns.
4. Allow the unit to remain under vacuum for at least 30
minutes.
5. Inspect the unit rating plate for the proper type of
refrigerant and quantity.
6. Weigh in the proper amount of new (or reclaimed)
refrigerant.