Operation Guidelines; Startup Checks; Before Starting The Unit - Daikin Destiny VFD Series Installation And Maintenance Manual

Indoor air handler

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Table of Contents

Startup Checks

ROTATING FAN

Can cause severe injury or death. Before servicing fans, lockout and tag

out power.

FIRE/ELECTRIC SHOCK HAZARD

Can cause property damage, personal injury or death. Wire fan power

supply and ground motor frame in accordance with local electric codes.

FAN MOTOR REQUIRES OVERLOAD PROTECTION

Failure to provide motor overload protection can result in fire, property

damage, electric shock, personal injury or death. Connect motor to an

overload protective device rated in compliance with local electric codes.

DO NOT OVERHEAT FAN MOTOR

High air temperatures the fan section can cause the fan motor to burnout.

On draw-through air handlers or air handlers with the fan section down the

air stream from the heating section, the discharge air temperature of the

heating section must not exceed 104°F (40°C).

Cautions indicate potentially hazardous situations, which can result in

personal injury or equipment damage if not avoided.

When performing startup and service, always take thorough

safety precautions. Start-up functions must be performed by

trained, experienced personnel.

IM 782-12 • DESTINY AIR HANDLERS

WARNING

DANGER

WARNING

CAUTION

Before Starting the Unit

Make sure that fan electrical power source is disconnected and

locked in the OFF position before entering fan section.

1. With ductwork connected, check the unit for complete

and proper install tion.

2. Check that all construction debris is removed and filters

are clean.

3. Check that all electrical work is complete and properly

terminated. Check that all electrical connections are

tight and that the proper voltage is connected. Phase

imbalance must not exceed 2%.

4. Ball bearings on fan shaft and motor are prelubricated

and do not need grease before startup.

5. Check tightness of setscrews in bearings and fan

wheel(s). If retightening is needed, make certain the fan

wheel(s) are aligned properly or setscrews are torqued

per

Table 38 on page

6. Check alignment of fan and motor sheaves and belt

tension. Adjust if necessary. Check tightness of sheave

setscrews and/or capscrews. See

and

Figure 50 on page 48

page

49.

7. Leak test the thermal system to verify that connections

are tight.

8. Check that condensate drain is trapped.

9. Rotate shaft by hand to be sure it is free.

10. Fan startup: Fan should start and run. Observe the

rotation. If the fan is operating backward, reverse two

legs of the three-phase supply power.

NOTE: Variable pitch fan drives are usually provided for

operation in the mid-speed adjustment range.

However, the drives usually ship with the adjustment

opened for minimum fan speed. Adjust the drives for

the proper airflow. Refer to

page

47.

After first 48 hours of operation:

1. Disconnect and lockout electrical power source.

2. Check tightness of all bearing, wheel, and sheave

setscrews (or capscrews). See

3. Recheck belt tension and adjust if necessary. Belts

tensioned sufficiently to slip one to two seconds at

startup will perform satisfactorily, extending life and

reducing vibration. If retensioning is necessary, be

certain to retain sheave alignment.

Table 32: Bearing Collar and Wheel Hub Setscrew Torque

Setscrew Diameter, in

1/4

1/16

3/8

7/16