Carrier WEATHERMASTER 48/50Z030-105 - Manual (Page 7)

7
START-UP
Unit Preparation — Check that unit has been installed in
accordance with the installation instructions and applicable
codes.
Unit Setup — Make sure that the economizer hood has
been installed and that the outdoor filters are properly installed.
Internal Wiring — Ensure that all electrical connections
in the control box are tightened as required. If the unit has
staged gas heat make sure that the LAT sensors have been
routed to the supply ducts as required.
Accessory Installation — Check to make sure that all
accessories including space thermostats and sensors have been
installed and wired as required by the instructions and unit
wiring diagrams.
Crankcase Heaters — Crankcase heaters are energized
as long as there is power to the unit, except when the compres-
sors are running.
Evaporator Fan — Fan belt and fixed pulleys are factory-
installed. See Tables 3-25 for fan performance. Remove tape
from fan pulley, and be sure that fans rotate in the proper
direction. See Tables 26-28 for motor limitations. See Table 29
for air quantity limits. Static pressure drop is shown in
Tables 30A-30C.
FIELD-SUPPLIED FAN DRIVES — Supply fan and power
exhaust fan drives are fixed-pitch, non-adjustable selections, for
maximum reliability and long belt life. If the factory drive sets
must be changed to obtain other fan speeds, consult the nearest
Browning Manufacturing Co. sales office with the required new
wheel speed and the data from Physical Data and Supply Fan
Drive Data tables (center distances, motor and fan shaft diame-
ters, motor horsepower) in Installation Instructions for a modi-
fied drive set selection. For minor speed changes, the fan sheave
size should be changed. (Do not reduce the size of the motor
sheave; this will result in reduced belt horsepower ratings and
reduced belt life.) See page 128 for belt installation procedure.
Controls — Use the following steps for the controls:
1. Set any control configurations that are required (field-
installed accessories, etc.). The unit is factory configured
for all appropriate factory-installed options.
2. Enter unit set points. The unit is shipped with the set point
default values. If a different set point is required, use the
scrolling marquee, Navigator display, ComfortVIEW™
software or Service Tool to change the configuration
values.
3. If the internal time schedules are going to be used, config-
ure the Occupancy schedule.
4. Verify that the control time periods programmed meet
current requirements.
5. Start unit using Service Test mode to verify operation of
all major components.
6. If the unit is a VAV unit make sure to configure the static
pressure set point. To check out the VFD, use the VFD in-
structions shipped with the unit.
Gas Heat — Verify gas pressure before turning on gas heat
as follows:
1. Turn off field-supplied manual gas stop, located external
to the unit.
2. Connect pressure gages to supply gas tap, located at field-
supplied manual shutoff valves.
3. Connect pressure gages to manifold pressure tap on unit
gas valve.
4. Supply gas pressure must not exceed 13.5 in. wg. Check
pressure at field-supplied shut-off valve.
5. Turn on manual gas stop and initiate a heating demand.
Jumper R to W1 in the control box to initiate heat.
6. Use the Service Test procedure to verify heat operation.
7. After the unit has run for several minutes, verify that
incoming pressure is 5.0 in. wg or greater and that the
manifold pressure is 3.5 in wg. If manifold pressure must
be adjusted refer to Gas Valve Adjustment section.
IMPORTANT: The computer system software
(ComfortVIEW™, Service Tool, etc.) that is used to
interact with CCN controls always saves a template of
items it considers as static (e.g., limits, units, forcibil-
ity, 24-character text strings, and point names) after
the software uploads the tables from a control. There-
after, the software is only concerned with run time
data like value and hardware/force status. With this in
mind, it is important that anytime a change is made to
the Service-Config table “generics” (which in turn
changes the points contained in the GENERIC point
table), that a complete new upload be performed. This
requires that any previous table database be
completely removed first. Failure to do this will not
allow the user to display the new points that have been
created and the software will have a different table
database than the unit control.
IMPORTANT: Do not attempt to start unit, even
momentarily, until all items on the Start-Up Checklist
(in installation instructions) and the following steps
have been completed.
IMPORTANT: Unit power must be on for 24 hours
prior to start-up of compressors. Otherwise damage to
compressors may result.