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14. INSTALLATION INFORMATION
14-3. Precautions for Outdoor unit/Heat source unit
14-3-1. Installation environment
• Outdoor unit with salt-resistant specification is recommended to use in a place where it is subject to salt air.
• Even when the unit with salt-resistant specification is used, it is not completely protected against corrosion.
Be sure to follow the directions or precautions described in Instructions Book and Installation Manual for installation and
maintenance. The salt-resistant specification is referred to the guidelines published by JRAIA (JRA9002).
• Install the unit in a place where the flow of discharge air is not obstructed. If not, the short-cycling of discharge air may occur.
• Provide proper drainage around the unit base, because the condensation may collect and drip from the outdoor units.
Provide water-proof protection to the floor when installing the units on the rooftop.
• In a region where snowfall is expected, install the unit so that the outlet faces away from the direction of the wind, and install a snow
guard to protect the unit from snow. Install the unit on a base approximately 50 cm higher than the expected snowfall.
Close the openings for pipes and wiring, because the ingress of water and small animals may cause equipment damage.
If SUS snow guard is used, refer to the Installation Manual that comes with the snow guard and take caution for the installation to
avoid the risk of corrosion.
• When the unit is expected to operate continuously for a long period of time at outside air temperatures of below 0ºC,
take appropriate measures, such as the use of a unit base heater, to prevent icing on the unit base.
(Not applicable to the PUMY-P-NHMU series)
• Install the snow guard so that the outlet/inlet faces away from the direction of the wind.
• When the snow accumulates approximately 50 cm or more on the snow guard, remove the snow from the guard.
Install a roof that is strong enough to withstand snow loads in a place where snow accumulates.
• Provide proper protection around the outdoor units in places such as schools to avoid the risk of injury.
• A cooling tower and heat source water circuit should be a closed circuit that water is not exposed to the atmosphere.
When a tank is installed to ensure that the circuit has enough water, minimize the contact with outside air so that the oxygen from
being dissolved in the water should be 1 mg/L or less.
• Install a strainer (50 mesh or more recommended) on the water pipe inlet on the heat source unit.
• Interlock the heat source unit and water circuit pump.
• Note the followings to prevent the freeze bursting of pipe when the heat source unit is installed in a place where the ambient
temperature can be 0ºC or below.
• Keep the water circulating to prevent it from freezing when the ambient temperature is 0ºC or below.
• Before a long period of non use, be sure to purge the water out of the unit.
• Salt-resistant unit is resistant to salt corrosion, but not salt-proof.
Please note the following when installing and maintaining outdoor units in marine atmosphere.
1. Install the salt-resistant unit out of direct exposure to sea breeze, and minimize the exposure to salt water mist.
2. Avoid installing a sun shade over the outdoor unit, so that rain will wash away salt deposits off the unit.
3. Install the unit horizontally to ensure proper water drainage from the base of the unit.
Accumulation of water in the base of the outdoor unit will significantly accelerate corrosion.
4. Periodically wash salt deposits off the unit, especially when the unit is installed in a coastal area.
5. Repair all noticeable scratches after installation and during maintenance.
6. Periodically check the unit, and apply anti-rust agent and replace corroded parts as necessary.
14-3-2. Unit characteristics
• When the Thermo ON and OFF is frequently repeated on the indoor unit, the operation status of outdoor units may become un-
stable.
14-3-3. Relevant equipment
• Provide grounding in accordance with the local regulations.
© 2017 Mitsubishi Electric US, Inc.
PQRY-P-T(S)LMU, Y(S)LMU (April 2017 Ver2)
WR2-149
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