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Controls, Start-Up, Operation, Service and ... - Climayoreo

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START-UP<br />

IMPORTANT: Do not attempt to start unit, even<br />

momentarily, until all items on the <strong>Start</strong>-<strong>Up</strong> Checklist<br />

(at the back of this book) <strong>and</strong> the following steps have<br />

been completed.<br />

IMPORTANT: The unit is shipped with the unit control<br />

disabled. To enable the control, set Local Machine Disable<br />

(<strong>Service</strong> TestSTOP) to No.<br />

Unit Preparation — Check that unit has been installed in<br />

accordance with the installation instructions <strong>and</strong> applicable<br />

codes. Make sure that the economizer hood has been installed<br />

<strong>and</strong> that the outdoor filters are properly installed.<br />

Internal Wiring — Ensure that all electrical connections<br />

in the control box are tightened as required. If the unit has<br />

staged gas heat make sure that the LAT (leaving air temperature)<br />

sensors have been routed to the supply ducts as required.<br />

Accessory Installation — Check to make sure that all<br />

accessories including space thermostats <strong>and</strong> sensors have been<br />

installed <strong>and</strong> wired as required by the instructions <strong>and</strong> unit<br />

wiring diagrams.<br />

Crankcase Heaters — Crankcase heaters are energized<br />

as long as there is power to the unit, except when the compressors<br />

are running.<br />

IMPORTANT: Unit power must be on for 24 hours<br />

prior to start-up of compressors. Otherwise damage to<br />

compressors may result.<br />

Evaporator Fan — Fan belt <strong>and</strong> fixed pulleys are factoryinstalled.<br />

See Tables 3-24 for fan performance. Remove tape<br />

from fan pulley, <strong>and</strong> be sure that fans rotate in the proper<br />

direction. Static pressure drop is shown in Table 25. See<br />

Tables 26-28 for motor limitations.<br />

FIELD-SUPPLIED FAN DRIVES — Supply fan <strong>and</strong> power<br />

exhaust fan drives are fixed-pitch, non-adjustable selections, for<br />

maximum reliability <strong>and</strong> long belt life. If the factory drive sets<br />

must be changed to obtain other fan speeds, consult the nearest<br />

Browning Manufacturing Co. sales office with the required new<br />

wheel speed <strong>and</strong> the data from Physical Data <strong>and</strong> Supply Fan<br />

Drive Data tables (center distances, motor <strong>and</strong> fan shaft diameters,<br />

motor horsepower) in Installation Instructions for a<br />

modified drive set selection. For minor speed changes, the fan<br />

7<br />

sheave size should be changed. (Do not reduce the size of the<br />

motor sheave; this will result in reduced belt horsepower ratings<br />

<strong>and</strong> reduced belt life.) See page 141 for belt installation<br />

procedure.<br />

<strong>Controls</strong> — Use the following steps for the controls:<br />

IMPORTANT: The unit is shipped with the unit control<br />

disabled. To enable the control, set Local Machine Disable<br />

(<strong>Service</strong> TestSTOP) to No.<br />

1. Set any control configurations that are required (fieldinstalled<br />

accessories, etc.). The unit is factory configured<br />

for all appropriate factory-installed options.<br />

2. Enter unit set points. The unit is shipped with the set point<br />

default values. If a different set point is required, use the<br />

scrolling marquee, Navigator display, or CCN interface<br />

to change the configuration values.<br />

3. If the internal time schedules are going to be used, configure<br />

the Occupancy schedule.<br />

4. Verify that the control time periods programmed meet<br />

current requirements.<br />

5. Use <strong>Service</strong> Test mode to verify operation of all major<br />

components.<br />

6. If the unit is a VAV unit make sure to configure the static<br />

pressure set point. To check out the VFD, use the VFD instructions<br />

shipped with the unit.<br />

Gas Heat — Verify gas pressure before turning on gas heat<br />

as follows:<br />

1. Turn off field-supplied manual gas stop, located external<br />

to the unit.<br />

2. Connect pressure gages to supply gas tap, located at fieldsupplied<br />

manual shutoff valves.<br />

3. Connect pressure gages to manifold pressure tap on unit<br />

gas valve.<br />

4. Supply gas pressure must not exceed 13.5 in. wg. Check<br />

pressure at field-supplied shut-off valve.<br />

5. Turn on manual gas stop <strong>and</strong> initiate a heating dem<strong>and</strong>.<br />

Jumper R to W1 in the control box to initiate heat.<br />

6. Use the <strong>Service</strong> Test procedure to verify all heat stages of<br />

operation.<br />

7. After the unit has run for several minutes, verify that<br />

incoming pressure is 5.0 in. wg or greater <strong>and</strong> that the<br />

manifold pressure is 3.5 in wg. If manifold pressure must<br />

be adjusted refer to Gas Valve Adjustment section on<br />

page 163.

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