Blower Delay

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 1). When the delay time has elapsed, a speed value is read from DIP switch SW1 positions 1 through 3 (see the CFM Tables) and the blower is ramped up to that speed.

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 1). When the delay time has elapsed, the blower is ramped toward zero.

Table 1: ON and OFF Blower Delay Time Switch Settings

DIP SWITCH 2 SECTION				BLOWER DELAY
STATE				TIMES

2	1	4	3	ON - SEC	OFF - MIN
OFF	OFF			30
OFF	ON			60
ON	OFF			120
ON	ON			240
		OFF	OFF		2
		OFF	ON			4
		ON	OFF		6
		ON	ON		8

Factory Set

Motor Blower Speed

Three blower speed outputs are provided. A “G” call for fan will provide the Low speed only. A “W” heat call will provide the Heat speed only. A “Y” cooling call will provide the Cool speed 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.

Six dip switches select Speed values for heat, cool, fan and dehumidification blower speeds (see the CFM Tables).

Blower On and Off Delays

Four Heat blower on and four blower off delays are selected by two dip switches for each function. Refer to Table 1 for specific delay values.

Speed Selection values

Three dip switches select 8 cooling speeds. Dependant fan, and dehumidification speeds are selected by the same switches, their tabular values are enacted when their function is called.

Three additional dip switches select 8 heating speeds which are enacted when heat is called. This allows independent selection of heating and cooling capacity parameters. See the CFM Tables for speeds.