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All installations and services must be performed by qualified service personnel.
Heat Mode
When a call for heat ("W") is received from the thermostat, if the "Cool" mode is not already
active, the "T-T" terminal is energized and the blower on delay is started. The on-off pattern of
DIP switch SW2 (positions 1 and 2) select one of four blower on delay values (see Table 7).
When the delay time has elapsed, the "HEAT" blower speed is energized. The control remains
in steady heat mode until the thermostat is satisfied. When the call for heat signal is removed, the
"T-T" terminal is de-energized and the blower off delay is started. The on-off pattern of DIP
switch SW2 (positions 3 and 4) select one of four blower off delay values (see Table 7). When
the delay time has elapsed, the "HEAT" blower speed terminal is de-energized.
DIP SWITCH 2 SECTION
1
2
OFF OFF
ON
OFF
OFF
ON
ON
ON
Table 7: ON and OFF Blower Delay Time Switch Settings
Motor Blower Speed
Three interconnected blower speed outputs are provided. A "G" call for fan will provide power
to the LOW speed tap only. A "W" heat call will provide power to the Heat speed tap only. A
"Y" cooling call will provide power to the Cool speed tap only.
In the case of thermostat calls for "Y" and "W" together, blower speed selection will be
determined by the input that was first initiated. In the case where the control is in a cooling mode
with both "Y" and "W" inputs energized and then the "Y" input is removed, the cooling blower
off time will be executed prior to the control switching into a heating mode. In the case where
the control is in a heating mode with both "Y" and "W" inputs energized and then the "W" input
is removed, the heating blower off time will be executed prior to the control switching into a
cooling mode. In the case where a call for fan "G" already exists and either a "W" or a "Y" call
is initiated, the blower speed will switch to the respective "W" or a "Y" speed following the
blower on delay for that call.
STATE
Counter Flow
3
4
ON - SEC
OFF
OFF
ON
OFF
OFF
ON
ON
ON
17
BLOWER DELAY TIMES
ON
-
SEC
15
30
24
60
36
120
48
240
OFF
-
MIN
2
4
6
8
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