JOHNSON CONTROLS
53
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
3
SECTION 3 - MAINTENANCE
GENERAL REQUIREMENTS
The maintenance requirements for AHUs are shown
below. The procedure is in the left-hand column, and
the minimum required frequency is marked is de-
scribed in the right-hand column.
Refer to
ANSI/ASHRAE Standard 62.1-2010
for start-
up and maintenance practices related to achieving ac-
ceptable indoor air quality.
ANSI/ASHRAE Standard
TABLE 11 -
MINIMUM / MAINTENANCE REQUIREMENTS ACCORDING TO ASHRAE
PROCEDURE
EVERY 3
MONTHS
EVERY 6
MONTHS
ANNUALLY
EVERY 5
YEARS
Maintain filters and air cleaning devices.*
X
Visually inspect or remotely monitor the outdoor air damp-
ers and actuators for proper function.
X
Clean and maintain humidifiers to limit fouling and microbial
growth.
X
Visually inspect the dehumidification coils for cleanliness
and microbial growth. Clean when fouling is observed.
X
Visually inspect drain pans and other adjacent surfaces
subject to wetting
for cleanliness and microbial growth and
clean when fouling is observed
X
Visually inspect outdoor air intake louvers, bird screens,
mist eliminators, and adjacent areas
for cleanliness and
integrity. Clean, when necessary
X
Verify sensors used for dynamic minimum outdoor air con-
trol accuracy and recalibrate or replace as necessary.
X
Measure the minimum quantity of outdoor air in the AHUs
except for AHUs under 1000 L/s (2000 CFM. If measured
minimum airflow rates are less than 90% of the minimum
outdoor rate in this manual. they shall be adjusted or
modified to bring them above 90% or shall be evaluated to
determine if the measured rates are in conformance with
this ASHRAE standard.
X
Maintain the floor drains located in plenums or rooms that
serve as air plenums to prevent transport of contaminants
from the floor drain to the plenum.*
X
Keep clear the space provided for routine maintenance
and inspection around ventilation equipment for equipment
component accessibility.*
X
Investigate and rectify the visible microbial contamination.*
X
Investigate and rectify the water intrusion or accumulation.*
X
*
Minimum frequencies may be increased or decreased from what is indicated in this table.
62.1-2010
is under continuous maintenance by a Stand-
ing Standard Project Committee (SSPC), for which the
Standards Committee has established a documented
program for regular publication of addenda or revi-
sions, including procedures for timely, documented,
consensus action on requests for change to any part of
the standard as shown in
