Coolerado C60A Installation Manual Download Page 17

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Coolerado Installation

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Table 2: Water Header Pressure Settings.

EXAMPLE

: If the Inlet dynamic main water pressure were 50

psi (344 kPa) when adjusting the regulator on an M50, the
pressure at the header would be set at 5.2 psi (36 kPa).

CAUTION: It is absolutely essential that the pressure
regulator be set to deliver the proper pressure at the water
distribution head before installation can be considered
complete.

For the most accurate setting possible, take a

dynamic pressure reading at the point where the water
supply enters the water distribution head. This can be done
by temporarily installing a pressure gage immediately at the
point where the water supply enters the water distribution
header, as in the following picture, and adjusting the
dynamic pressure to the desired level

see Figure 26

Water Header Pressure Location, Figure 26.

Step 10 –Electrical Power Connections
Note: Do not power on the unit until Step 15.

See Appendix 2 for Details.
See Appendix 4 for multi-unit wiring.

DANGER:

To avoid personal injury or death, do not supply

power to unit with the units high voltage terminal box cover
removed.

CAUTION:

Be sure field wiring complies with all local and

national fire, safety, and electrical codes, and voltage to
system is within limits shown on unit rating plate. Contact
local power company for correction of improper voltage.
See unit rating plate for recommended circuit protection
device.

NOTE: Keep wiring color coded according to system
drawings for easy troubleshooting and standardization. For
color code reference, see

Appendix 2.

NOTE: Operation of the unit on improper line voltage
constitutes abuse and could affect unit reliability. See the
unit rating plate. Do not install unit in system where voltage
may fluctuate outside of normal voltage fluctuations

NOTE: Use copper conductors only between the disconnect
switch and the unit.

ROUTE GROUND AND POWER WIRES

DANGER: The unit cabinet must have an uninterrupted or
unbroken ground to minimize personal injury if an electrical
fault should occur. The ground may consist of electrical wire
or metal conduit when installed in accordance with existing
electrical codes. Failure to follow this warning can result in
an electric shock, fire, or death.

CAUTION: Without an uninterrupted or unbroken ground
the motor can have arcing across the bearings causing
premature failure of fan motor.

Remove access panel and electrical box cover to gain access
to unit wiring. Extend wires from disconnect through power
wiring hole provided and into unit control box. Size wires per
National Electric Code.

CONNECT GROUND AND POWER WIRES

The unit fan motors will run on 200 to 277 VAC, 50/60 Hz
single phase with an electrical circuit breaker of 5 amperes.
The transformers provided are 208 VAC or 240 VAC to 24 VAC
only. In some instances a 277 VAC is required and the
transformer can be requested at time of purchase.

15 amperes is generally the smallest circuit breaker that can
be purchased. Local electrical codes shall be applied and take
precedence over any recommendations given here.

The M50A has a terminal electrical box at the bottom of the
unit, see

Appendix 10

. Notice the Black Jumper wire with the

spade connection must be moved from the blank terminal to
the 208, 240 or 277 VAC terminals see

Figure 27

CAUTION: The transformer was not designed to power other
equipment.

138

207

275

344

413

482