Carrier 39S handleiding
Handleiding
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53390031-01 Printed in U.S.A. Form 39S-4SI Pg 62 9-22 Replaces: 39S-3SI
© Carrier 2022
Coil Cleaning
DETERGENT
Spray mild detergent solution on coils with garden-type sprayer.
Rinse with fresh water. Check to ensure condensate line is free.
Excess water from cleaning may flood unit if condensate line is
plugged.
Winter Shutdown (Chilled Water Coil Only)
ANTIFREEZE METHODS OF COIL PROTECTION
1. Close coil water supply and return valves.
2. Drain coil as follows:
Method I — ‘Break’ flange of coupling at each header loca-
tion. Separate flange or coupling connection to facilitate coil
draining.
Method II — Open both valves to auxiliary drain piping.
3. After coil is drained:
Method I — Connect line with a service valve and union
from upper nozzle to an antifreeze reservoir. Connect a self-
priming reversible pump between the low header connection
and the reservoir.
Method II — Make connection to auxiliary drain valves.
4. Fill reservoir with any inhibited antifreeze acceptable to code
and underwriter authority.
5. Open service valve and circulate solution for 15 minutes; then
check its strength.
6. If solution is too weak, add more antifreeze until desired
strength is reached, then circulate solution through coil for
15 minutes or until concentration is satisfactory.
7. Remove upper line from reservoir to reversible pump. Drain
coil to reservoir and then close service valve.
8. Break union and remove reservoir and its lines.
9. Leave coil flanges or coupling open and auxiliary drain
valves open until spring.
AIR DRYING METHOD OF COIL PROTECTION (UNIT
AND COIL MUST BE LEVEL FOR THIS METHOD)
1. Close coil water supply and return main valves.
2. Drain coil as described in procedures for Antifreeze Methods
of Coil Protection.
3. Connect air supply or air blower to inlet header connection
and close its drain connection.
4. Circulate air and check for air dryness by holding mirror in
front of open vent in outlet header drain connection. Mirror
will fog if water is still present.
5. Allow coil to stand for a few minutes; repeat Step 4 until coil
is dry.
PIPING
Direct expansion, chilled water, and hot water coils should always
be piped for counterflow. (Fluid should enter the coil at the leav-
ing-air side.) Steam coils must have the condensate connection at
bottom of coil.
To determine intervals for cleaning coils in contaminated air oper-
ations, pressure taps should be installed across the coils and
checked periodically. Abnormal air pressure drop will indicate a
need for cleaning the coils.
Annual maintenance should include:
1. Clean the line strainers.
2. Blow down the dirt leg.
3. Clean and check operation of steam traps.
4. Check operation of control valves.
5. Check the operation of check valves to prevent condensate
flowback.
6. Check operation of thermostatic air vents, if used. A float and
thermostatic trap will contain a thermostatic air vent. When
the bellows is ruptured, it will fail closed.
7. Check operation of vacuum breakers.
8. Check operation of the thermal protection devices used for
freeze-up protection.
9. Steam or condensate should not be allowed to remain in the
coil during the off season. This will prevent the formation and
build up of acids.
There are additional precautions and control strategies, as found in
various catalogues and in the ASHRAE Fundamentals Handbook
and in the Carrier System Design Guide — Piping Section, when
the entering-air temperature to the coil falls below 35°F. These
conditions occur when IDT coils are used for pre-heat and/or face
and bypass applications.
Freeze up protection:
1. Use a strainer in the supply line and the dirt leg ahead of the
trap.
2. Use a vacuum breaker in the return.
3. Do not use overhead returns from the coil. A floodback can
occur.
4. An immersion thermostat to control outdoor-air dampers and
the fan motor is recommended. This control is activated when
the steam supply fails or the condensate temperature drops
below a predetermined temperature, usually 120°F.
5. On low pressure and vacuum systems, the immersion ther-
mostat may be replaced by a condensate drain with a thermal
element. This element opens and drains the coil when the
condensate temperature drops below 165°F. Note the thermal
condensate drain is limited to 5 psig pressure. At greater coil
pressures they will not open.
In spite of the precautions listed above, a coil may still freeze up.
An oversize capacity coil, at partial load, with a modulating steam
control valve will occasionally freeze. Freezing occurs in the 20°F
to 35°F range of entering-air temperatures. A better installation
would be an undersize coil, with an on/off control valve with ther-
mostatic control in the outside air, set at 35°F air temperature, in-
stalled downstream of the first coil; or setting the minimum steam
pressure at 5 psig.
Filters
FILTER SECTIONS
Open or remove filter panel to replace old filter with a new filter.
See physical data Tables 1-4 for filter data.
Lubrication
MOTORS
Lubricate in accordance with nameplate attached to motor or with
manufacturer’s recommendations included with motor.
BEARINGS
Fan Bearings
Lubricate fan bearings in accordance with manufacturer’s recom-
mendations included with blower.
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Productinformatie
| Merk | Carrier |
| Model | 39S |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 10967 MB |
