Caution – Carrier 40RU User Manual

Page 26

Chilled Water Coil Freeze Protection -- Shut off water

supply to unit. Remove side panel of unit and remove vent

and drain plugs in top and bottom of coil header. Drain

coil and blow out remaining water. Reinstall plugs and

side panel.

Alternative freeze protection methods follow:

Circulate hot water within the water coil’s supply main
or supplementary space heating.

Close off supply lines to unit and open a union or
field--supplied drain valve in the return line.

IMPORTANT: Draining from return line will not

completely drain water from coils.

After draining as much water as possible from coils, add
sufficient antifreeze to prevent residual water in the coil
from freezing.

Add a sufficient quantity of non--corrosive antifreeze to
the entire system to prevent all water within the system
from freezing.

Coil Removal -- Remove unit panels and corner posts as

required. Disconnect coil connections and remove

fastening screws. Remove coil through end or side

sections of unit.

Cleaning Cooling Coil -- Remove return--air filters.

Remove any heavy dirt that may have accumulated on

underside of coil. Coil can be cleaned more easily with a

stiff brush, vacuum cleaner, or compressed air when coil

is dry. If coil is wet or if water is to be used for cleaning,

guard against splashing water on electrical components or

damaging surrounding area. Clean coil baffles as

applicable and check for tight fit to be sure air does not

bypass coil.

Cleaning Insulation -- The insulation contains an

immobilized antimicrobial agent that helps prevent the

growth of bacteria and fungi. Clean the inner surface of

the insulation according to the separate maintenance

instructions shipped with the unit.

Replacing Filters -- Filters can be removed and installed

from either side of the unit. Install new filters in units that

have one fan as follows:

1. Remove the side access panel (retain screws).
2. Remove the filter retainer clip (see Fig. 28).
3. Remove old filters by lifting and tilting them out of

the filter track. See Fig. 16 and 29.

4. Reverse the procedure to install new filters.

To install new filters in larger units that have 2 fans,

follow the preceding steps, but use the factory--supplied

filter hook to slide filters within reach for removal. The

filter hook is shipped inside the unit in the filter track.

UNIT OPERATION HAZARD
Failure to follow this caution could cause equipment

damage.
Do not operate unit without air filters.

CAUTION

SLIDE

FILTER
RETAINER
CLIP

C10703

Fig. 28 -- Remove Filter Retainer Clip

C10704

Fig. 29 -- Filter Removal/Replacement

40RU