Nordyne M3RL Series Ventilation, START-UP and Adjustments, Start-Up Procedure

The thermostat must not be installed on an outside wall or any other location where its operation may be adversely affected. Adverse affects include radiant loading from fireplaces, sunlight, or lighting fixtures, and convective loading from warm air registers or electrical appliances.

To check the heat anticipator setting either:

1.Add the current draw of the system com- ponents; or

2.Measure the current flow on the thermostat R-W circuit after the circulating blower motor has started.

Set the heat anticipator according to the ther- mostat manufacturer's instructions for heat anticipator settings.

VENTILATION

Ventilation must be provided for homes built to HUD Manufactured Homes Safety and Con- struction Standards. This ventilation can be sup- plied by the VentilAire III or VentilAire IV acces- sories. (See Table 12). Alternate means to pro- vide the ventilation air must meet the require- ments of all applicable local and federal codes.

For installation of the VentilAire III or IV, follow the instructions provided with the VentilAire kit.

START-UP AND ADJUSTMENTS

General

Prior to start-up, verify that:

1.The line voltage power leads are securely connected, that the polarity of the con- nections is correct, and that the furnace is properly grounded.

2.The thermostat wires (R, W, Y, and G) are securely connected to the correct leads on the terminal strip of the circuit board.

3.The natural gas line service pressure must not exceed 10.0 in. water column (0.36 psig), and must not be less than 4.5 in. water column (0.16 psig). For LP gas the line service pressure must not exceed 14 in. water column (0.51 psig), and must not be less than 11.0 in. W.C. (0.40 psig).

26

A/C Condensing Unit

Condensing Unit

Control Box

COM

Blower Off

60 90

120 180

R

3 Amp

Timing

R

Connect

C

24 V

Fuse

TWIN

Y

R & W

Y

For

G

Flame Signal Light

Heating

G

(Yellow)

Only

W

Room

W

Status Light

9

6

3

(Red)

Thermostat

8

5

2

7

4

1

NOTE: The "Y"

terminal on the

UTEC control board

must be connected

EAC

to the thermostat

for proper cooling

Neutrals

mode operation.

HUM

FIELD WIRING

Unused Motor Leads

6

3

HUM

COOL

HEAT

XFMR EAC

Low Voltage

M3 M2 M1

L1

5

2

Connections

4

1

Figure 28. Low Voltage Field,

Four-wire Heating/Cooling Applications

4.The roll-out and vent safety manual reset switches are closed. If necessary, press the red button to reset a switch. See Figure 26 for location. DO NOT install a jumper wire across a switch to defeat its function. If a switch reopens on start-up, DO NOT reset the switch without identify- ing and correcting the fault condition which caused the switch to trip.

5.The blower door is in place, closing the door switch in the line voltage circuit.

6.The gas line has been purged and all connections are leak tight.

Start-Up Procedure

1.Set the thermostat to the lowest setting.

2.Close the disconnect(s) to provide line voltage to the furnace.

3.Follow the procedures given on the oper- ating instructions label attached to the furnace.

4.Set the thermostat above room tempera- ture and verify the sequence of operation. (See the SEQUENCE OF OPERATION.)