Magic-Pak HWC8-12, Руководство по установке

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Page 7 of 18 507388-01 Issue 1504
edition) for installations in the U.S. or the Canadian Electrical
Code Part 1, CSA C22.1 (latest edition) for installations in Canada.
See rating plate for correct wire ampacity for the cooling chassis
required, and size wire accordingly.
Thermostat
Install the thermostat according to the directions furnished with
it. The thermostat must be located on an inside wall where it will
not be affected by drafts, sunlight, or any other heat producing
appliances. Connect the thermostat wires to the low voltage
leads on top of the unit following the wiring diagram attached
to the unit. The heat anticipator setting is 0.50 amp.
Air Filter
All indoor return air must be filtered. A permanent-type filter is
furnished with the unit, located directly behind the access panel.
Removing the panel permits access to the filter. See Figure 3.
If an installation is made in which it is more desirable to mount the
filter exterior to the unit, in the return duct work or elsewhere, the
permanent filter can be used or replaced with a disposable filter.
If a disposable filter is used, refer to the information provided in
Table 1 when sizing the disposable filter.
Supply and Return Duct(s)
Provide duct(s) sized sufficiently to handle the larger of the air
volumes for heating or cooling provided by this model.
Connect the supply duct to the top of the unit using canvas
connections or other flexible connections to prevent noise
transmission into the duct system.
To connect the return duct to the system, use a straight piece
of duct 22” wide by 6” deep. Insert the duct into the return
opening in the bottom of the unit and flange the duct over the
existing flanges around the opening inside the unit. Make sure
that all sides of the duct are flanged over to permit removal of
the cooling chassis if required. Use a flexible connection to attach
the remainder of the return duct. The return duct should be
sealed to the unit casing and must terminate outside the space
containing the furnace.
x 3600 x
= Cubic Feet Per Revolution
BTU/HR
INPUT # Seconds Per Revolution
Heating
Value
Adjustments – Heating Section
Temperature Rise
At time of installation, the temperature rise must be adjusted to
be within the range specified on the unit rating plate. See table 2.
Pressure Regulator
he gas input must not exceed the figures shown on the rating plate.
The unit is equipped for rated inputs with manifold pressures of:
3.5” W.C. for natural gas and 10.5” W.C. for propane.
The manifold pressure can be measured by removing the pipe
plug in the automatic gas valve. Connect a water manometer and
measure the pressure.
Only small variations in gas input may be made by adjusting the
regulator. In no case should the final manifold pressure vary
more than 0.3” W.C. for natural gas or 0.7” W.C. for propane.
To adjust the regulator, turn the adjusting screw on the regulator
clockwise to increase pressure and input or counterclockwise to
decrease pressure and input.
For natural gas installations, check the burner rate by observing
the gas meter (making sure that all other gas appliances are
turned off). The test hand on the meter should be timed for
at least one revolution. Note the number of seconds for one
revolution.
Adjustments – Cooling Section (HWC models)
No adjustments are required or should be attempted regarding
any of the components of the cooling chassis. The chassis should
be checked to see that none of the wiring is loose or missing.
Cooling chassis is charged with R410A refrigerant.
Pressure Regulator
Model
Number
Filter Area
(sq. in.)
HWC8-12 300
HWC8-18 480
HWC8-24 480
HWC8-30 480
Minimum Required Surface Area
for Disposable Filters
Table 1