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Heat Controller, Inc.
Any time the unit is running in the cooling mode,
it will operate at the lower airflow to improve
latent capacity. The "DEHUM" LED will be
illuminated at all times. Heating airflow is not
affected. NOTE: Do not select
dehumidification mode if cooling setting is tap 1.
2. Automatic (Humidistat-Controlled)
Dehumidification Mode: When the
dehumidification mode is selected (via DIP
switch setting) AND a humidistat is
connected to terminal DH, the cooling airflow
will only be reduced when the humidistat
senses that additional dehumidification is
required. The DH terminal is reverse logic.
Therefore, a humidistat (not dehumidistat) is
required. The "DEHUM" LED will be
illuminated only when the humidistat is
calling for dehumidification mode. Heating
airflow is not affected. NOTE: Do not
select dehumidification mode if cooling
setting is tap 1.
Cooling Settings
Tap
Setting
1
2
3
4
ECM BLOWER CONTROL
HTV/HTD/HTH SERIES
Table 5: ECM Board Tap Settings
DIP Switch
Tap
Setting
SW1
SW2
ON
ON
ON
OFF
OFF
ON
OFF
OFF
CFM Adjust Settings
Tap
DIP Switch
Setting
SW7
SW8
Test
ON
ON
-
ON
OFF
+
OFF
ON
Norm
OFF
OFF
Figure 16: ECM Interface Layout
Heating Settings
DIP Switch
SW3
SW4
1
ON
ON
2
ON
OFF
3
OFF
ON
4
OFF
OFF
Dehum Mode Settings
Tap
Setting
Norm
Dehumid
27
30
Aux / Emergency Heat Settings
Tap
DIP Switch
Setting
SW5
SW6
1
ON
ON
2
ON
OFF
3
OFF
ON
4
OFF
OFF
DIP Switch
SW9
ON
OFF
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Troubleshooting
