Modine Manufacturing Airedale ClassMate CMD Installation And Service Manual page 7

UNIT LOCATION / INSTALLATION
Preparation
1. Select the unit location. Ensure the wall structure is
adequate for the required mounting provisions as outlined
in the "INSTALLATION" section.
2. Before installation, ensure that the correct electrical power
supply is available for the unit.
3. Each unit requires independent circuit protection and
isolated power supply.
4. If the installation has multiple units, check that unit model
and tagging corresponds with the installation plans. Please
contact the factory immediately if discrepancies are noted.
5. Check to make sure that the units will have adequate
installation clearance around them. Placing the unit within
12 inches (305mm) of a wall on one side may result in
decreased efficiency and increased sound.
6. Note that each unit has a condensate connection at the
rear and suitable provisions should be made for draining.
If multiple units tee into a common drain manifold, the drain
line must be sized to ensure free draining with all the units
in operation.
7. Inspect the wall sleeve installation for gaps that would
allow leakage of outdoor air into the space. All joints and
abutments should be sealed with waterproof sealant.
8. Ensure the wall opening sill height aligns with the outside
air and relief air openings on the back of the classroom
unit. If not, a rear extension is required to provide a sealed
transition. Rear extensions are available for purchase from
the factory.
9. For ground and water source heat pumps (models SMG
and SMW), the installation should be a closed loop
system to avoid potential for heavy scaling or biological
contamination.
10. Due to the slightly flammable nature of R-454B, there are
minimum room size requirements by unit size to ensure
that if there is a refrigerant leak accumulating in the space,
it will not reach a density that can become a risk of ignition.
Refer to Table 8.1 for minimum room sizes, minimum
airflows, and for units installed in a closet, the minimum
ventilation opening size.
11. When a unit is placed in a closet within the room the unit
serves, the ventilation opening that the return air passes
through shall conform to the following requirements:
• Shall be no less than 2.5 sqft in area.
• Shall be no more than 11.81 in (300mm) above the floor.
• At least 50% of the opening area shall be below 7.87in
(200mm) above the floor.
• The bottom of the lowest opening shall not be more than
3.94in (100mm) above the floor.
Drainage
Each unit has an internal condensate drain, terminating
internally to the unit. A 1.5" (38.1mm) with a 1.125" (28.6mm)
condensate drain hole is available on the back side of the
unit (see Figure 20.1, Figure 21.1, and Figure 22.1 for the
location). This must be connected to the main drain system
in accordance with any local codes and general good piping
practice.
Water Quality Standards
Note:


This section only applies to models SMG and SMW.
Water quality is incredibly important to take into account when
selecting and installing a water source heat pump in any
application. The installation should be a closed loop system to
avoid potential for heavy scaling or biological contamination.
All water that passes through a coaxial heat exchanger should
be evaluated for potential scaling, corrosion, and erosion
characteristics as detailed in Table 7.1 below. Scaling issues
should be addressed with a regularly scheduled flushing by a
qualified service technician, as this process requires special
fluids and pumping equipment. If any values fall outside of the
ranges given or a unit is to be installed in a brackish or saltwater
application, a secondary heat exchanger outside of the unit is
required to avoid the unit warranty being voided. Spin down
style water filters are recommended to prevent clogging and to
handle the flow rate required.
Table 7.1 - Water Quality
Water Quality Component Acceptable Range
pH
Calcium and Magnesium
Carbonate
Ryznar Stability Index (RSI)
Langlier Saturation Index (LSI)
Iron Fe2+ (Ferrous)
Bacterial Iron Potential
Iron Oxide
Hydrogen Sulfide
Ammonia
Ammonia Ion Compounds
(Chloride, Hydroxide, Nitrate,
and Sulfate)
Total Dissolved Solids (TDS)
Suspended Solids
(Filter if Necessary)
AIR 2-504.0
Concern
<7.0 Corrosion,
7.0 to 9.0
>7.5 Scaling
<100 ppm Scaling
<6.0 Scaling,
6.0 to 7.0
>7.0 Corrosion
<-0.5 Corrosion,
-0.5 to 0.5
>0.5 Scaling
<0.2 ppm Fouling
<1.0 ppm Fouling
<0.5 ppm Corrosion
<2.0 ppm Corrosion
<0.5 ppm Corrosion
<1000 ppm Corrosion
<10 ppm & <600
micron size particles, Erosion
<6.0 ft/s velocity
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