This document is a user manual for the Hessaire MC91 evaporative cooler, providing detailed instructions for setup, operation, maintenance, and troubleshooting.
Function Description:
The Hessaire MC91 is an evaporative cooler designed to reduce air temperature through the principle of heat absorption by moisture evaporation. It operates by pulling hot outside air through wet cooling pads, where water evaporates and cools the air before it is discharged from the unit. This process is similar to the cooling sensation experienced when stepping out of a swimming pool or shower. The cooler is intended for use in environments where fresh air can be drawn in and exhausted, providing a constant air change and the benefit of evaporative air cooling.
Important Technical Specifications:
- Power Supply: 115 volts.
- Water Inlet Pressure: Limited to a maximum of 50 PSI. A pressure reducer (25 PSI) is recommended if the valve is overcome.
- Cooling Media: Xel50 Media pads, made from a special resin-impregnated craft paper, designed for evaporative cooling.
- Casters: The unit includes 4 casters, with 2 locking wheels to prevent movement during operation.
- Hardware: Includes 16 bolts and washers for caster installation, and a garden hose adapter.
Usage Features:
- Placement: The cooler must be positioned in front of an open window or door to operate effectively, allowing fresh air to be drawn in. Another open window or door is required for air exhaust from the room.
- Manual Fill: The cooler can be filled manually via a front fill door using a hose or bucket. A water fill indicator helps monitor the water level. The fill door has a spring lock mechanism.
- Auto Fill Connections: The unit can be connected to a continuous water supply using a garden hose, coil hose (customer-supplied), or a direct water line. A supplied hose adapter attaches to the float valve nipple. The float valve is pre-set to fill the cooler to about half capacity in auto-fill configuration.
- Extension Cords: Permissible to use extension cords when needed, though GFCI circuits (common in garages or patios) are not recommended due to potential inadvertent tripping.
- Control Switches (Mechanical Version):
- Rotary Switch/Motor Speed: Has four positions (clockwise from OFF): OFF, LOW Fan Only, MED Fan Only, HI Fan Only.
- Pump Switch: Controls the pump.
- Middle Rocker Switch: Controls the fan oscillation.
- Power Switch: Controls power to the main controls and is illuminated when in the ON position. Other switches will not function if the power switch is OFF.
- Run-Dry Capability: The cooler is designed to operate even if it runs out of water, without causing damage to the pump.
- New Pad Odor: New Xel50 Media pads may have a slight odor initially, which will dissipate with use. Draining the tank frequently during the break-in period can help speed this process.
Maintenance Features:
- Regular Cleaning: The cooler should be shut down and disconnected from the power supply at regular intervals. The water tank should be drained of dirty water, sprayed out with fresh water, and refilled. This prevents calcium buildup on pads and other surfaces.
- Cooling Pad Cleaning: Cooling pads can be sprayed through to wash them out, allowing water to deposit in the tank for draining. The removable panel and media pad can be sprayed on the ground. Light pressure should be used when spraying pads. Crucially, never spray pads with water while the cooler is operating and the fan is running, as this can damage the motor and void the warranty.
- Back Panel Removal: To access the pump, float valve, and water distributor spreaders, remove the three screws from the top of the back panel, lift the panel up, pull it out from the bottom, and then slide it out of the cabinet. This procedure should only be performed after disconnecting the power supply.
- Draining the Cooler Tank: Unscrew the drain cap from the drain assembly to drain water. Tipping the unit carefully to the drain side can assist in draining all water.
- Cooling Media Removal and Replacement:
- With the access panel removed, pull off the pad retainer disc from the pad pin (older models may require pliers to grasp and pull a pushed-on pin; newer models have a threaded disc).
- Remove pins from the pads and carefully remove pads from the fixed side mounting frame. Repeat for the back panel.
- Xel50 pads have a 45/45 flute and can be installed on either side, ensuring the distribution pad is at the top for even water distribution.
- Reinstall pads, insert pins, and attach the retaining disc.
- Reinstall the back panel.
- Pump Maintenance and Replacement: (Disconnect power supply before this procedure.)
- The submersible pump is mounted inside the tank with a retention bracket. Remove the bracket.
- The strainer cap on the bottom of the pump can be cleaned of debris.
- To replace, remove the switch control panel from the top of the cooler by inserting a small screwdriver into the tap slots.
- Disconnect the pump clip from the control and feed the plastic clip through the control box.
- The pump cable is connected by twist clips and potentially cable ties; remove these to free the pump.
- Reinstall the new pump in reverse, ensuring the cable is secured away from the fan blade. Reattach the pump clip and reinstall the control panel.
- Float Valve Replacement or Adjustment: (Disconnect power supply before this procedure.)
- The float valve is on the left side (facing the front grill) and held by a retaining nut and rubber washer.
- Remove any hose adapters.
- Remove the rear panel assembly.
- Remove the retaining nut and rubber washer, then remove the float valve.
- Reinstall in reverse, setting the valve adjustment to around 60 degrees for optimal results. Ensure supply water PSI is within the 50 PSI specification.
- End-of-Season Storage: Before storing for winter:
- Drain the tank and wipe it clean.
- Clean the filter.
- Reassemble and run the cooler on FAN ONLY for 30 minutes to dry out the filter.
- Filter Cleaning: Ensure the filter is kept clean throughout the summer season. At the end of each day, run the cooler on FAN ONLY for 30 minutes to dry out the filter.
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