6
3. Removal of the center support is required on units
with 21” wide cabinet. Remove and retain the two (2)
screws that secure the center support to the cabinet.
Remove the center support.
4.
Position the unit in the downflow position.
5. Remove side drain pan extension if present.
6. Using the drain pan to hold the coil assembly, slide the
coil assembly back into the cabinet on the downflow
brackets as shown in Figure 8.
7. Reinstall the center support (if removed) using the two
(2) screws removed in Step 5.
8. Reinstall the coil access panels and reinstall blower
access panel removed in Step 1 as shown in Figure
10.
9. Drain Connections for Horizontal Right Installation
a. Drain port labeled (B) in Figure 2 is the primary
drain for this application and condensate drain line
must be attached to this drain port. Drain port (b)
is for the secondary drain line (if used).
b. Remove red plugs from side drain pan before
connecting condensate drain pipes. Use removed
plug to close drain ports on vertical drain pan.
NOTE: If removing only the coil access panel from
the unit, the filter access panel
must
be removed first.
Failure to do so will result in panel damage.
6.4 Humid Environment Installations
NOTE: Each service kit mentioned in this instruction
is available through your local distributor. The kits are
not supplied with the air handler and must be used
to assist with condensation management in humid
environment applications. The individual installation
instructions provided with each kit must be followed.
6.4.1 ALL INSTALLATIONS – HUMID ENVIRONMENTS
Installations in areas where the return air environment
sees humidity levels above 65% relative humidity, a High
Humidity Kit (HHK) must be used. See Table 2 for Model
and Kit assignment.
HHK0004
HHK0005
HHK0006
HHK0007
HHK0008
AMST24B
AMST30B
AMST36B
AMST36C
AMST42C
AMST48C
AMST48C AMST48D AMST60D
Table 2
6.4.1.2 Downflow Installations – Humid
Environments
To prevent the coil pan “sweating”, the mandatory
Downflow Kit (DFK) must also be used in addition to the
High Humidity Kit (HHK). See Table 3 for the correct DFK
for each model.
DFKE-02
DFKE-03
AMST24B
AMST30B
AMST36B
AMST36C
AMST42C
AMST48C
AMST48D
AMST60D
Table 3
6.4.1.3 Horizontal Installations – Humid
Environments
In addition to the High Humidity Kit (HHK), in applications
where the air handler is installed in the horizontal position
(Left or Right), and the return air environment sees
humidity levels above 65% relative humidity, a Condensate
Management Kit (CMK) must be used for field application.
Applicable Kit and Model listing can be found in Table 4.
CMK0018 CMK0019 CMK0020
AMST24B
AMST36C
AMST30B
AMST36B
AMST42C
AMST48C
AMST48D
AMST60D
Table 4
UPFLOW
DOWNFLOW
Figure 3
Figure 4
