Carrier 42DH, Руководство пользователя

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Table 7 — Three Phase Electric Heater Availability
LEGEND NOTES:
1. Electric Heating Capacities BTUh)=Heater kW x 3413.
2. Electric Heater Amp. for 3-phase Power = (Heater kW x 1000)/
(Applied Voltage x 1.73).
Water Treatment
Proper water treatment is a specialized industry. Carrier recom -
mends consulting a water treatment expert to analyze water for
compliance with water quality parameters listed below, and to rec -
ommend an appropriate water treatment regimen. Water treatment
experts are able to recommend typical additives such as rust
inhibitors, scaling preventative, antimicrobial growth agents, or
algae preventatives. Anti-freeze solutions may also be used to
lower the freezing point.
Carrier water coil tubes and headers are constructed of
copper. Multiple brass alloys may be present in the valve
package. It is the user’s responsibility to ensure tube and
piping materials furnished by Carrier are compatible with
treated water. (See Table 8.)
Failure to provide proper water quality may affect the fan coil
units' warranty.
Table 8 — Water Quality Parameters
SERVICE
General
Each unit has an individual operating environment and conditions
that dictate its maintenance schedule. A formal schedule of regular
maintenance and an individual unit log should be established and
maintained. This will achieve maximum performance and pre -
serve the service life of each unit.
Observe and adhere to all safety precautions contained in the
preface of this manual during all service and maintenance
operations.
For more detailed information of service operations consult a
Carrier Sales Representative or the factory.
Coils
Coils should be cleaned by brushing the entering air face between
fins with a stiff brush. Brushing should be followed by cleaning
with a vacuum cleaner. If a compressed air source is available, the
coil may also be cleaned by blowing air through the coil fins from
the leaving air face. This should again be followed by vacuuming.
Units equipped with regularly replaced air filters will require less
frequent coil cleaning.
Electric Resistance Heater Assembly
Electric resistance heaters typically require no scheduled mainte -
nance when unit air filters are changed properly. The operation
and service life may be affected by other conditions and equip -
ment in the system. The two most important operating conditions
for an electric heater are proper airflow and proper supply voltage.
High supply voltage and/or poorly distributed or insufficient air -
flow over the element will result in element overheating and possi -
ble limit switch openings. (See Tables 6 and 7.)
kW
ELECTRIC HEATER
AMPS
UNIT SIZE (HEATER STAGES)
THREE PHASE
(1, 2 OR 3 STAGE)
06 08 10 12 16 20/22 30
208v 240v 480v 1 stg 2 stg 1 stg 2 stg 1 stg 2 stg 1 stg 2 stg 3 stg 1 stg 2 stg 3 stg 1 stg 2 stg 3 stg 1 stg 2 stg 3 stg
1.0 2.8 2.4 1.2 X — X — — — — — — — — — — — — — — —
1.5 4.2 3.6 1.8 X — X — X — X — — — — — — — — — — —
2.0 5.6 4.8 2.4 X — X — X — X — — — — — — — — — — —
2.5 6.9 6.0 3.0 X — X — X — X — — X — — — — — — — —
3.0 8.3 7.2 3.6 X — X — X — X — — X — — — — — — — —
3.5 9.7 8.4 4.2 X — X — X — X — — X — — X — — — — —
4.0 11.1 9.6 4.8 X X X X X X X X — X X — X X — — — —
4.5 12.5 10.8 5.4 X X X X X X X X — X X — X X — — — —
5.0 13.9 12.0 6.0 X X X X X X X X — X X — X X — — — —
6.0 16.7 14.4 7.2 X X X X X X X X — X X — X X — X X —
7.0 19.4 16.8 8.4 — — X X X X X X — X X — X X — X X —
8.0 22.2 19.2 9.6 — — X X X X X X — X X — X X — X X —
9.9 27.5 23.8 11.9 — — — — X X X X — X X — X X — X X —
12.0 33.3 28.9 14.4 — — — — — — X X X X X X X X X X X X
14.0 38.9 33.7 16.8 — — — — — — — — — X X X X X X X X X
15.0 41.6 36.1 18.0 — — — — — — — — — X X X X X X X X X
16.0 — 38.5 19.2 — — — — — — — — — X X X X X X X X X
18.0 — — 21.7 — — — — — — — — — — — — X X X X X X
19.9 — — 23.9 — — — — — — — — — — — — X X X X X X
25.0 — — 30.1 — — — — — — — — — — — — — — — X X X
30.0 — — 36.1 — — — — — — — — — — — — — — — X X X
X — Available Option
— — Not Available
WATER CONTAINING REQUIRED CONCENTRATION
SULPHATE Less than 200 ppm
Ph 7.0-8.5
CHLORIDES Less than 200 ppm
NITRATE Less than 100 ppm
IRON Less than 4.5 mg/l
AMMONIA Less than 2.0 mg/l
MANGANESE Less than 0.1 mg/l
DISSOLVED SOLIDS Less than 1000 mg/l
CaCO3 HARDNESS 300-500 ppm
CaCO3 ALKALINITY 300-500 ppm
PARTICULATE QUANTITY Less than 10 ppm
PARTICULATE SIZE 800 micron max