Unit installation

10 AGR 070A through 100A IOMM AGR-1

Figure 7, Refrigerant Piping (Some Components Are Optional)

Glycol Solutions

The system glycol capacity, glycol solution flow rate in GPM, and pressure drop through the cooler

may be calculated using the following formulas and data from Table 4 or Table 5.

1. Capacity -- Find the reduced capacity by multiplying the chiller’s capacity with water by the

capacity correction factor.

2. Flow -- To determine evaporator gpm (or Delta-T) knowing Delta-T (or gpm) and capacity:

table)(from

)(24

GPM Glycol tionFlowCorrec

TDelta

glycolcapacity

−

For Metric Applications -- To determine evaporator L/s (or Delta-T) knowing Delta-T (or L/s)

and kW:

table)(from

18.4

L/s Glycol tionFlowCorrec

TDelta

−×

Pressure drop -- To determine pressure drop through the evaporator, when using glycol, enter

the water pressure drop curve on page 12 at the water flow rate. Multiply the water pressure drop

by PD correction factor from Table 4 or Table 5 to obtain corrected glycol pressure drop.

To determine the unit's power consumption when using glycol, multiply the water system kW by

factor kW.

Test coolant with a clean, accurate glycol solution hydrometer (similar to that found in service

stations) to determine the freezing point. Obtain percent glycol from the freezing point table below.

On glycol applications it is normally recommended by the supplier that a minimum of 25% solution

by weight be used for protection against corrosion.

Note: The procedure

does not specify the

type of glycol. Use

the derate factors

found in Table 4 for

corrections when

using ethylene glycol

and those in Table 5

for propylene glycol.