Make-Up Air Installation Manual

01/17/2013 EI902

Temperature Set Point

The inside circuit board contains a screwdriver switch setting marked Ø through 9. This is usable only for Ø

through 7. Unless otherwise specified during the time of order, this unit is equipped with a default “D” chip.

This is a broad range temperature with settings at 12° steps. If you would like a more precise temperature

setting, the “plug-in chip” can be changed for a temperature range selection. Order a specific temperature

range chip code as shown below.

Ø = 40° 4 = 88°

1 = 52° 5 = 100°

2 = 64° 6 = 112°

3 = 76° 7 = 124°

Other Available (Special Order) Temperature Range Chips are as follows:

Switch Position A B C E H

0 90 96 20 68 88

1 100 100 25 72 90

2 110 104 30 76 92

3 120 108 35 80 94

4 130 112 40 84 96

5 140 116 45 88 98

6 150 120 50 92 100

7 160 124 55 96 102

Operational Tips

Monitor Lights

Main Control Board (WarmFlo)

Green Monitor LED - When illuminated the WarmFlo controller is receiving 24 volts at the R and

C terminals. Under all normal operating modes, this should be solid green.

As a secondary function this green LED provides status of the remote sensors. If a sensor is inoperative,

incorrectly wired, or malfunctioning; this monitor light is in a blinking or pulsing mode.

Upper Left, Monitor LED - The three red LED’s next to the output connector, indicate stage 1, 2,

and 3 operation (stage 1 is on the right).

Fuse – The WarmFlo board itself does not contain a traditional fuse, but at the “R” input terminal is

a automatic reset, short current protection device. If there has been a short circuit condition, and the green

LED is off, at least 2 to 3 minutes “cool off time” is required for this “fuse” to reset.

Electric Power Module (EPM)

Red LED – on relay board –

Illuminates when the low voltage hi-limit sensor probe opens. This applies

only after thermostat heat call and WarmFlo controller is stepping on the various element stages. If there

is a hi-limit condition, red LED is illuminated. As soon as the hi-limit cools and snaps back in, red LED

extinguishes.