Preventive Maintenance Guide - Northwind MAC1211 Engineering, Installation And Service Manual

PROBLEM: WATER LEAKING FROM UNIT
1. CAUSE: Leaky drain pan. REMEDY: Locate and repair leak with proper sealant.
2. CAUSE: Loose drain hose connection or hole in hose. REMEDY: Locate hole; replace hose if necessary. Tighten
hose clamp.
3. CAUSE: Did not replace tank after emptying. REMEDY: Replace tank to collect water properly.
4. CAUSE Tank improperly installed. REMEDY: Make sure water collection hole tank is in the UP position.
5. CAUSE: Defective condensate pump or excessive lift on pump. REMEDY: If pump lift exceeds 20 feet, a higher
lift pump will be necessary. Make sure check valve is operative, safety float is not energized, and
discharge line is not plugged or crimped. Change pump if necessary. Pump will operate against 20 feet of
water head pressure. If a combination of vertical height and horizontal drain line exceeds 20 feet of water
pressure drop, problems will occur.
All NorthWind units are designed to last and give maximum performance/reliability with minimum maintenance. To
extend the life of the unit, a few simple procedures must be performed.
1. BLOWER MOTORS
The external rotor motor and blower wheel is a balanced/bolted assembly requiring no maintenance. It is used in the
MAC1211, MAC1811.
Belt drive motors and blowers use pulley set screws and should be checked for tightness whenever the side panel is
removed for cleaning/maintenance. Belts should be inspected twice a year. All bearings are sealed and permanently
lubricated.
2. FILTERS
Every NorthWind unit is equipped with enhanced particle capture electrostatic filters (condenser and evaporator). Anti-
microbial protection is imbedded in the fiber and cannot be washed out. They are impervious to harsh conditions, UV
protected, nonreactive to chemicals/corrosive conditions and nonporous (will not absorb from the environment). How-
ever, they must be kept clean. Clogged filters reduce airflow and the efficiency of the system. Some environments require
filter cleaning every 2 weeks. Others, every 6 weeks. Clean as often as your conditions require.
The evaporator filter is located behind the evaporator grille, in the front panel. The filter and grille can be easily lifted out
of the unit. Once out of the unit, the filter can be sprayed with detergent and hosed off with water. Just shake off the ex-
cessive water and reinstall. The condenser filter is located behind the condenser grille on the left side of the unit. Clean
and reinstall using the same method as with the evaporator filter.
3. CONDENSATE PUMP
Follow these steps when servicing the condensate pump:
1. Disconnect power before servicing pump or any other component.
2. Make sure the floats move up and down freely and smoothly. Listen for the clicks of the switches.
3. Remove tank cover, clean volute and bottom of tank. Warm water, detergent or humidifier cleaner can be used to
remove any mineral deposits.
4. Make sure check valve moves freely and is free from any obstruction, particle or mineral buildup.
5. Inspect drain tubing for obstruction, dirt or kinks that could impede water flow. Clean and correct as necessary.
END OF SEASON STORAGE
1. Remove all water from the condensate tank.
2. Clean evaporator and condenser filters.
3. Remove any water from condensate pump sump and tank.
4. Turn the thermostat dial full counterclockwise (warmest position). Turn the unit on and run
2 hours in constant fan mode to completely dry out the filters and inside components.
5. Roll up the power cord and store in the cord storage box.
6. Store in a dry location.
7. Pack in original carton for extra protection.

PREVENTIVE MAINTENANCE GUIDE

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