MTD 248-604A Manual de instalación descargar pdf (Pagina 30)

Page 30 of 42 Self-Contained WSHP Unit Ventilator Models ARQ, ERQ, GRQ IM 1083

MicroTech II™ Unit Electrical

Connections

To avoid electrical shock, personal injury or death, be sure that eld

wiring complies with local and national re, safety, and electrical

codes, and voltage to the system is within the limits shown in the

job-specic drawings and unit electrical data plate(s).

Power supply to unit must be disconnected before making eld

connections. To avoid electrical shock, personal injury or death,

be sure to rigorously adhere to eld wiring procedures regarding

proper lockout and tagout of components.

See Table 11, 12 & 13, and Figure 47 and the job-specic electrical

drawings before proceeding with eld power and control wiring. See

also the wiring diagram provided on the unit ventilator right front

access panel.

Unit ventilators equipped with an optional electric heating coil have

electric heating coil power connections at right end only.

Procedure

1. Provide power supply to right end compartment to match unit

nameplate.

Figure 48: Electrical Power On/Off Switch Located

Behind Front-Middle Access Panel in Wire Trough, with

Power Entry accessed Behind Right-Front Access Panel

Use copper conductors only. Use of aluminum conductors may

result in equipment failure and overheating hazards. All wiring

in right hand compartment must be class 1.

DANGER

WARNING

CAUTION

2. Conrm that power is de-energized and locked and tagged-out.

3. Plug in the unit control wiring male plug(s) into the appropriate

female plug(s). Refer to Figures 49, 51, 52 & 53.

• Plug in 4-pin (for MicroTech II and Electromechanical, see

Figure 51).

• 10-pin (MicroTech II only, see Figure 52).

• 12-pin (MicroTech II only, see Figure 53).

4. Insert the main power wires into the main power On/Off switch

terminal lugs (A, B and C). Note that terminal lug B, not used

on single phase. Connect the Ground wire to the ground lug as

shown in Figure 50. Tighten the terminal lugs securely.

5. Reinstall the cover plate on the main power wire trough.

Note: For Electromechanical wiring (see page 36).

Control connections for elecromechanical are made to the

terminal block in the left end compartment.

Figure 49: Control Wiring Plug Connections in Right End

Compartment.

Figure 50: Electrical Power On/Off Switch for Power

Wiring Connections

Grommeted Power Wire Entry

Unit Main Power

On/Off Switch

Terminal lugs for main power wiring from unit,

eld connection by others

Main Power On/Off Switch

Ground Lug

Control wiring whips with

caps located in the right

front end compartment

Note: B not used on single phase.

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MTD 248-604A Manual de instalación Pagina 30

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