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Winter Shutdown Preparation
Dry Layup Shutdown
Rooms where chillers have chance of freezing or coming in
contact with hot water:
1. Close chilled water and condenser water isolation
valves (if available).
2. Drain chilled water and condenser water barrels.
a. If valves were not available both loops will need to
be drained completely.
3. Remove condenser and chilled water bell ends.
a. If chiller is single or three pass, one pipe end should
be removed.
4. Using nitrogen or an air compressor blow out all tubes
to ensure no water is left inside.
Wet Layup Shutdown – Unheated Rooms
Rooms where chillers will have chance of freezing but not
connected to the boiler loop:
1. Close chilled water and condenser water isolation
valves (if available).
a. If valves are not available, they will need to be
installed.
2. Drain chilled and condenser water barrels.
3. Completely fill the barrels with an appropriate amount
of ethylene glycol solution for 15˚F (8.3˚C) below the
expected low ambient condition.
4. Leave the barrels full of the solution until startup.
5. Mark the barrel stating what was left inside for
precautions next season.
Wet Layup Shutdown – Heated Rooms
Rooms that are heated and will not have contact with hot
water:
1. Close chilled water and condenser water isolation
valves (if available).
a. If valves are not available, they will need to be
installed.
2. Talk to local chemical treatment company for correct
chemical treatment for water left in barrel over winter.
a. If treatment needs to be changed, make proper
arrangements.
Maintenance Tasks
The maintenance tasks described herein present the basic,
minimal, steps required to successfully complete a task.
Local policies and protocols may require more elaborate
procedures with additional checks and inspections.
Critical Cleaning Tasks
Coated Coils Cleaning Tasks
WARNING
Hazardous Chemicals!
Failure to follow this safety precaution could result in
death or serious injury. Coil cleaning agents can be
either acidic or highly alkaline and can burn severely
if contact with skin or eyes occurs.
Handle chemical carefully and avoid contact with
skin. ALWAYS wear Personal Protective Equipment
(PPE) including goggles or face shield, chemical
resistant gloves, boots, apron or suit as required. For
personal safety refer to the cleaning agent
manufacturer’s Materials Safety Data Sheet and follow
all recommended safe handling practices.
NOTICE
Coil Fin Damage!
Failure to use proper coil cleaning methods could
cause damage to coil fins, increase airside pressure
drop, reduced unit performance or nuisance unit
shutdowns.
Follow recommended coil cleaning procedures. High
velocity water from a pressure washer or compressed
air should NEVER be used to clean a coil.
Recommended Coil Cleaner
Coil Cleaner or a ph neutral cleaning agent, assuming it is
used in accordance with the manufacturer’s direction on
the container for proper mixing and cleaning, has been
approved for use on coated coils.
Recommended Cleaning of Coated Coil Surfaces
Routine cleaning of all coil surfaces is essential to maintain
optimal performance, extended life of coated coils, and to
maintain warranty coverage of coatings.
The following cleaning procedures are recommended as
part of the routine maintenance activities for Coated Coils.
Note: Documented routine cleaning of coated coils is
required to maintain warranty coverage.
Prior to cleaning the unit, turn off and lock out the main
power switch to the unit and open all access panels.
Perform the following steps.
1. Remove Surface Debris - Surface debris and dirt must
be removed prior to water rinse to prevent further
restrictions of airflow. If unable to back wash the side of
the coil opposite that of the coils entering air side, then
surface debris or dirt should be removed with a vacuum
cleaner. If a vacuum cleaner is not available, a soft non-
metallic bristle brush may be used. In either case, the
tool should be applied in the direction of the fins. Coil
surfaces can be easily damaged (fin edges bent over) if
the tool is applied across the fins.
Maintenance Procedures
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