Master-Bilt 12X13X7-7 Split pak refrigeration systems manual

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This means the evaporator temp would be 10 degrees lower than the space temperature and the

condenser would be 20 degrees higher than the ambient.

Example: For cooler using R404A, 35 degree space with 90 degree ambient, evaporator would

need to be 25 degrees and condenser coil would need to be roughly 110. Using a

Pressure/Temperature(PT) chart, the suction pressure at gauge would be 61 and the discharge

pressure would be 270.

Freezer using R404A, -10 space, 90 degree ambient: -20 suction or 16 psig, 110 discharge or

270 psig

Once these pressures are obtained, the superheat at the evaporator should be confirmed to be

between 8 to 10 degrees.This ensures that the full capacity of the evaporator is being used and

confirms no flooding in the evaporator.

For systems that have a head pressure control, an additional 1 pound per horsepower should be

added for low ambient (outside) temperature conditions.

Note that the pressures will change as space and/or ambient changes. If the temp goes up, the

pressure will go up. If temp goes down, the pressure goes down.

This is assuming a correctly charged system per the above recommendations and no faulty

components.

DANGER

Charging of the refrigeration system must be performed only by a certified refrigeration

mechanic. Improper or faulty hook-up of refrigeration electrical components can result in injury

or death.

Technical installation instructions for Pre-Charged Remote Refrigeration are given on the

following pages. Installation requirements for other remote refrigeration systems may vary. If

additional information is needed, your certified refrigeration mechanic or electrician can call our

technical service department. Quick-Couples are pre-charged with the proper refrigerant at the

factory.

C. Pre-Charged Remote Refrigeration Systems.

●

Place a steel or treated-wood spreader on the top of the

walk-in to distribute the load of the coil. The spreader must

be at least twice the width of the coil. The coil must be

mounted away the edge of the roof a distance equal to the

height of the coil (See Figure #1).

● Uncrate the coil and through-bolt it to the ceiling of the

walk-in with suitable fasteners.

Figure #1 Quick-Couple Remote Refrigeration

● Uncrate the condensing unit and locate near coil. Be sure air movement around the unit is not restricted,

so the condensing unit will have a sufficient supply of air to function properly.

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