Carrier 28QX User Manual

Page 18

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

The pipe diameters and the allowable lengths

for this loop are listed below.

ALLOWABLE PIPE LENGTHS

Pipe O.D. (in.) Maximum Equivalent Length (ft)

7/8

1/8

25
50

100

A value of 8 equivalent ft should be used for the
pipe length inside the glycol pump package.

It is advisable to terminate the storage return

pipe below the lowest water level in the storage
tank. This will make this loop a closed loop and

will assure that no air could infiltrate the loop. It is

important that the height of the return pipe above

the storage water level not exceed 6 feet. If it is
necessary to do so, a special fill-up procedure that

is found in the Start-Up Instructions will have to
be followed, pg 23.

LOCATE AND INSTALL THERMISTOR SEN
SORS AND AQUASTAT BULBS - Located in the

low voltage terminal block compartment of the

control box are 2 thermistor sensors and 3 bulb
wells, Eig. 18.

Two of the bulb wells are to be used with the

aquastat bulbs located on the control box in pump
package. Fig. 12. These wells are to be inserted in

the storage tank so that the aquastat bulbs are
located at the same level in the storage tank as the
outlet to the Tri-X pump. The aquastats are bulb
and capillary refrigerant charged sensors. The

capillary tubes are 20-ft. long. Consequently, the

pump package should be placed with this restric
tion in mind.

All water supply lines leaving storage must be more than 6--in. from bottom of tank, but no closer than

2 ft from lowest water level.

Fig. 23 — Typical Glycol System Piping Diagram