General Waterside; Towers; Waterside Piping Arrangements; Water Temperature - Trane IntelliPak SCWF 20 Installation, Operation And Maintenance Manual

Commercial self-contained signature series 20 to 110 tons

Table of Contents

minimum of 1/2" for each 10' of horizontal run, away

from the unit. Be sure to install the condensate drain

"P" trap drain plug. Before starting the unit, fill the trap

with water to prevent negative pressure in the fan

section from impeding condensate flow.To facilitate

drain pipe cleaning, install plugged tees in place of 90°

elbows.

General Waterside Recommendations

for Cooling Towers

Cooling tower control affects the unit cycle rates.

Condenser water temperature swings from 10-15°F

may cause excessive compressor, water valve, and unit

cycling. Be sure to set the tower controls to minimize

compressor/unit cycling.

Waterside Piping Arrangements

Install a condenser water pump between the cooling

tower (either open or closed) and the self-contained

unit. Lay out the remainder of the system condenser

piping in reverse returns. This helps balance the

system by equalizing the length of supply and return

pipes. Multi-story buildings may use a direct return

system with balancing valves at each floor.

Install the supply riser and its return in close proximity.

Furnish both with permanent thermometers to check

the waterside balance during startup and routine

maintenance checks.

Also, include strainers at each pump inlet and unit.

Install drain valves at the riser's base to allow drainage

points for system flushing during startup and routine

maintenance. For condenser draining and header

removal, include a shutoff/balancing valve on the

entering and leaving waterside pipes, drain tees, and

unions of each unit.

N N o o t t e e : : Unit does not have floor drains.

Figure 23. Condenser water piping components for

cooling tower system

Water Temperature Requirements

Do not allow the entering water temperature to go

below 54°F (12.2°C) on units with constant water flow

SCXF-SVX01Q-EN

I I n n s s t t a a l l l l a a t t i i o o n n - - M M e e c c h h a a n n i i c c a a l l

(basic piping).This will cause the compressors to shut

down and the mechanical cooling function will lockout.

However, the economizer (if enabled) will continue to

function. The compressors will reset when the entering

water temperature reaches 58°F (15°C).

Units with variable water flow (intermediate piping)

have a modulating condensing pressure control valve

that allows compressor operation down to entering

water temperatures of 35°F (2°C).

For more information on constant and variable water

flow, see the Sequence of Operation section of this

manual.

N N o o t t e e : : Units with a waterside economizer can be set

from the human interface panel for variable or

constant water flow.

Water Piping Verification

•

Make return and supply water connections to the

unit and/or waterside economizer piping package

with recommended valves and piping components.

•

Install unions to allow waterside maintenance.

•

Install cooling tower and standby pumps.

•

Treat water to prevent algae, slime, and corrosion.

•

Prevent refrigerant piping from rubbing against

other objects.

Installating the Hydronic Coil

Steam and Hot Water Coil

W W A A R R N N I I N N G G

U U n n i i t t S S t t r r u u c c t t u u r r a a l l I I n n t t e e g g r r i i t t y y ! !

F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n

d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y . .

U U n n i i t t p p a a n n e e l l s s p p r r o o v v i i d d e e s s t t r r u u c c t t u u r r a a l l i i n n t t e e g g r r i i t t y y . . D D o o n n o o t t

r r e e m m o o v v e e m m o o r r e e t t h h a a n n t t w w o o n n o o n n - - a a d d j j a a c c e e n n t t p p a a n n e e l l s s a a t t o o n n e e

t t i i m m e e a a s s t t h h i i s s c c o o u u l l d d c c a a u u s s e e t t h h e e p p l l e e n n u u m m f f r r a a m m e e t t o o

c c o o l l l l a a p p s s e e . .

N N o o t t e e : : Hydronic coil options are available only on 20-80

ton units and can be field or factory mounted.

1. Position the coil box behind the unit with open side

facing the unit inlet.

2. An envelope containing the gasket and mounting

screws to attach the coil to the unit ships in the

bottom of the unit. Install the pressure sensitive

gasket to the unit side of the vertical flange on the

coil box in two places.

3. Before attaching the coil box, connect the coil duct