DUOTEC AHV080014 Instrukcja obsługi i instalacji - Strona 12
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Drukuj stronęOWNER'S MANUAL INSTALLATION INSTRUCTIONS
Table 3
3-1
Single-Stage Operation
(no staging - all electric
heat
together)
EHIA05KN
EHIA07KN
EHIA10KN
EHIA15KB
EHIA20KB
EHIA25KB
AIRFLOW CHECK
For proper system operation, the air flow through the indoor coil
should be between 350 and 450 CFM per ton of cooling capacity.
The air flow through the unit can be determined by measuring the
external static pressure to the unit.
1. Set up to measure external static pressure at the supply and
return duct connections. Refer to Figure 16.
2. Drill holes in the ducts for pressure taps, pilot tubes, or other
accurate pressure sensing devices.
3. Connect these taps to a level inclined manometer or draft gauge.
4. Ensure the coil and filter are clean, and all the registers are open.
5. Determine the external static pressure with the blower operating
at maximum airflow.
6. If the external static pressure is 1.2'' w.c. or less, you can refer to
the airflow tables in this manual.
7. If the external static pressure is over 1.2'' w.c., check for
obstructions in the ducts, insufficient return size or clogged air
filter. Resolve and verify the static pressure is under 1.2'' w.c.
Heat Strip Staging
3-2
Two-Stage Capable
EHIA15KB
EHIA20KB
EHIA25KB
Static Pressure Check
Figure 16
Supply
Indoor
Section
TEMPERATURE RISE CHECK
Temperature rise is the difference between the supply and return air
temperatures.
NOTE: The temperature rise can be adjusted by changing the
heating speed tap at the fan control board. Refer to the unit's
Installation Instructions for airflow information.
A temperature rise greater than 60°F (33.3°C) is not
recommended.
1. To check the temperature rise through the unit, place
thermometers in the supply and return air ducts as close to the
unit as possible, avoiding direct radiant heat from the heater
elements.
2. Open ALL registers and duct dampers.
3. Set thermostat Heat-Cool selector to HEAT.
4. Set the thermostat temperature setting as high as it will go.
5. Turn electric power ON.
6. Operate unit AT LEAST 5 minutes, then check temperature rise.
NOTE: The maximum outlet air temperature for all models is 200°F
(93.3°C).
7. Set thermostat to normal temperature setting.
8. Be sure to seal all holes in ducts if any were created during this
process.
10
DUOTEC AIR HANDLER: AHV
Incline
Manometer
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