Caution – Carrier AQUAZONE 50VS User Manual

Page 10

All riser modifications necessitated by variations in floor-to-

floor dimensions including cutting off or extending risers is the

sole responsibility of the installing contractor.

Additional expansion compensation must be made in the

riser system in the field where movement is expected to exceed

the factory allowances. Figure 9 displays the expansion charac-

teristics of risers compared to water temperature differential.

Assuming a minimum water temperature of 20 F and a

maximum water temperature of 120 F, the temperature differ-

ence of 100 F indicates 90 feet of riser will expand or contract

1 inch. To eliminate stress, a riser system must be anchored at

least once to the building structure. Technical information on

pipe expansion, contraction and anchoring can be found in the

ASHRAE HVAC Systems and Equipment Handbook and vari-

ous other technical publications. Riser expansion and the an-

choring of each unit is the responsibility of the design engineer

and installing contractor.
RISER CONNECTIONS — Install cabinet with risers as

follows:

1. Move cabinet into position.

2. Be sure that all the copper fittings are clean and free of

dirt. Raise the cabinet upright and lower it into the riser

from the floor below.
NOTE: The top of each riser is equipped with a 3 in. deep

swaged connection. There is sufficient extension at the

bottom to allow insertion of approximately 2 in. of the

riser into the swaged top of the riser below.

3. Center risers in the pipe chase and shim the cabinet level.

Plumb risers in two planes to assure proper unit operation

and condensate drainage.

4. Attach the cabinet assembly to the floor and the building

structure on at least two sides using sheet metal angles

(field provided). A field-provided base vibration dampen-

ing pad can be used to help eliminate transfer of any vi-

bration to the structure. If vibration dampening pads are

used some rough-in dimensional changes will need to be

considered before installation due to style and thickness

of the pads. Additional anchorage can be provided by in-

stalling brackets at the top of the cabinet (field provided).

5. DO NOT attach drywall studs to the equipment cabinet.

CAUTION

Keep risers off the floor while moving the cabinet. Failure

to heed this warning could result in equipment damage.

Fig. 7 — System Piping Arrangements

DIRECT RETURN

REVERSE RETURN

WITH A COMMON REVERSE

RETURN RISER

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Fig. 8 — Friction Loss of Risers

PIPE

IZE

3/4 inch

1 inch

1-1/4 inch

1-1/2 inch

2 inch

2-1/2 inch

Water Flow Rate - GPM

Pre

ure Drop - Ft W

ater/100 Ft of Ri

2 ft/s

3 ft/s

4 ft/s

ater V

elocity (feet per

second)

5 ft/s

6 ft/s

3.0 4.0 5.0 6.0 7.0 8.0 10 20 30 40 50 60 70 80 100

10
9.0
8.0
7.0
6.0

5.0

4.0

3.0

2.0

1.0

9.0
8.0
7.0
6.0

5.0

4.0

3.0

2.0

1.0

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Fig. 9 — Allowable Riser Lengths Between

System Expansion Loops

1-1/2”

1”

Water Temperature Difference - F

er Len

th for 1 in. and 1-1/2 in. Expan

ion - Ft

550

500

450

400

350

300

250

200

150

100

20 40 60 80 100 120 140 160

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