Johnson Controls JHETC60H User Manual

6112628-UIM-B-0622
Johnson Controls Ducted Systems 19
Section XIII: Maintenance
Inspect filters at least once per month, and clean or replace them when
they become dirty. The frequency of cleaning depends upon the hours
of operation and the local atmospheric conditions. Clean filters keep
unit efficiency high.
Coil cleaning
If cleaning the coil is necessary, clean with water only.
As an alternative to water, Evap-Green by Nu-Calgon is the only pH
neutral coil cleaner approved for use when it is properly diluted.
Ensure to thoroughly rinse the cleaned coils after using Evap-Green.
Lubrication
The bearings of the blower motor are permanently lubricated.
Condensate drains
During the cooling season, check the condensate drain lines to be sure
that condensate is flowing from the primary drain but not from the sec-
ondary drain. If condensate ever flows from the secondary drain, shut
off the unit immediately and clean the condensate pan and drains to
insure a free flowing primary drain.
Section XIV: Air system adjustment
To check the cubic feet per minute (CFM), measure the external duct
static using a manometer and static pressure tips. To prepare coil for
static pressure measurements, run only the fan to ensure a dry coil.
Drill two holes, one 12 in. away from the air handler in the supply air
duct and one 12 in. away from the air handler in the return air duct
(before any elbows in the ductwork). If the internal filter rack is utilized,
the return air static pressure reading must be taken after the filter but
before the indoor coil. Insert the pressure tips and energize the blower
motor. See Table 13 to determine the airflow and make the necessary
adjustments to keep the CFM within the airflow limitations of the coil.
External duct static
Measure the supply air static pressure. Record this positive number.
Measure the return air static pressure. Record this negative number.
Treat the negative number as a positive, and add the two numbers to-
gether to determine the total external system static pressure. If a filter
rack is installed on the return air end of the air handler or indoor coil sec-
tion, make sure to measure the return air duct static between the filter
and the indoor coil.
Section XV: Installation verification
Before and during the completion of the installation procedures, verify
all tasks are accomplished as indicated in this installation manual.
CAUTION
Ensure adequate precautions are taken to protect electrical compo-
nents from liquid.
NOTICE
See Table 13 for air handling unit airflow data (CFM).
!
Figure 17: Duct static measurements
Thermal expansion valve (TXV) check list
 Is the coil metering device installed correctly?
 Was the correct TXV installed per the outdoor unit Technical Guide?
 Is the TXV bulb positioned correctly?
 Is the temperature bulb insulated?
 Is the equalizer line connected?
Figure 18: Drain traps
Take measurements here if using
a filter rack.
Return air static must be taken
between the filter and indoor coil.
A1704-001
3 in. minimum
Secondary
Primary
Premade traps Handmade traps
A1705-00
1

Johnson Controls JHETC60H Specifications

General

Brand	Johnson Controls
Model	JHETC60H
Category	Air Handlers
Language	English