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Table 8 – Color Coding for Indoor Fan Motor Leads

Black = High Speed

Orange = Med---High Speed

Red=MedSpeed

Pink = Med---Low Speed

Blue = Low Speed

Selection of Proper Fan Speeds for Operation

Modes:

NOTE: All models are factory--shipped for nominal high stage

and low stage cooling airflow operation at minimum external static

pressure. Many models are factory--shipped for nominal high stage

and/or low stage gas heating airflow at minimum external static

pressure. Table 10 provides airflow data for higher external static

pressures.

Low Stage Gas Heating: Table 10 shows the suitability of each

speed for a given external static pressure for low stage gas heating.

Any speed/static combination that is outside the rise range is

marked “NA” and must not be used. The unit must operate within

the low stage gas heat rise range printed on the rating plate.

Connect the chosen fan speed wire to “LO HEAT” connection on

theIGCBoard(seeFig.18).

High Stage Gas Heating: Table 10 shows the suitability of each

speed for a given external static pressure for high stage gas heating.

Any speed/static combination that is outside the rise range is

marked “NA” and must not be used. The unit must operate within

the high stage gas heat rise range printed on the rating plate.

Connect the chosen fan speed wire to “HI HEAT” connection on

theIGCBoard(seeFig.18).

Low Stage Cooling/Heat Pump: Using Tables 11, 12, and 13,

and the nominal airflow for low stage cooling (Table 1) find the

external static pressure drops for wet coil, economizer, and filter,

and add them to dry coil measured on the system. Using this total

static pressure, use Table 10 to find the airflows available at the

total static pressure. Connect the chosen fan speed wire to “LO

COOL” connection on the IGC Board (see Fig. 18).

High Stage Cooling/Heat Pump:Using Tables 11, 12, and 13,

find the external static pressure drops for wet coil, economizer, and

filter, and add them to dry coil measured on the system. Using this

total static pressure, use Table 10 to find the airflows available at

the total static pressure. The speed chosen must provide airflow of

between 350 to 450 CFM per ton of cooling. Connect the chosen

fan speed wire to “HI COOL” connection on the IGC Board (See

Fig. 18).

High Stage Enhanced Dehumidification Cooling: Using the

total static pressure for selecting the high stage cooling speed, use

Table 10 to find lower speed/airflows available at that total static

pressure. All airflows highlighted in Table 10 are acceptable for

Dehum speed. The speed chosen must provide airflow of between

320 to 400 CFM per ton of cooling. Connect the chosen fan speed

wire to “DHUM” connection on the IGC Board (see Fig. 18).

To activate the high stage enhanced dehumidification cooling

mode, the shunt jumper in Fig. 18 must be moved from the No DH

to DH selection (See Fig. 18, close up).

Continuous Fan (All models): Continuous fan speed is the same

speed as Low Stage Cooling.

Using the Same Fan Speed for More than One Mode: Some fan

speeds are ideal for more than one mode of operation. It is

permissible to use a field--supplied jumper wire to connect one

speed tap wire to two or more speed connections on the ignition

board (IGC). Jumper wires must use 18 AWG wire with at least

2/64” insulation.

Cooling Sequence of Operation

a. Continuous Fan

(1.) Thermostat closes circuit R to G energizing the

blower motor for continuous fan. The indoor fan is

energized on low speed.

b. Cooling Mode

(1.) Low Stage: Thermostat closes R to G, R to Y1

and R to O. The compressor and indoor fan are

energized on low speed. The outdoor fan is also

energized.

(2.) High Stage: Thermostat closes R to G, R to Y1, R

to Y2 and R to O. The compressor and indoor fan

are energized on high speed. The outdoor fan is

also energized.

c. Heat Pump Mode

(1.) Low Stage: Thermostat closes R to G, R to Y1.

The compressor and indoor fan are energized on

low speed. The outdoor fan is also energized.

(2.) High Stage: Thermostat closes R to G, R to Y1, R

to Y2. The compressor and indoor fan are ener-

gized on high speed. The outdoor fan is also ener-

gized.

d. Defrost Mode

(1.) Outdoor Fan is disabled, thermostat closes R to O

and R to W1. Low stage gas heat tempers the leav-

ing air. When defrost is complete, unit will return

to heating mode. If room thermostat is satisfied

during defrost, unit will shut down and restart in

defrost on next call for heat.

Step 4 — Defrost Control

Quiet Shift

Quiet Shift is a field--selectable defrost mode, which will eliminate

occasional noise that could be heard at the start of defrost cycle and

restarting of heating cycle. It is selected by placing DIP switch 3

(on defrost board) in ON position.

When Quiet Shift switch is placed in ON position, and a defrost is

initiated, the following sequence of operation will occur. Reversing

valve will energize, outdoor fan will turn off, compressor will turn

off for 30 sec and then turn back on to complete defrost. At the

start of heating after conclusion of defrost reversing valve will

de--energize, compressor will turn off for another 30 sec, and the

outdoor fan will stay off for 40 sec, before starting in the Heating

mode.

Defrost

The defrost control is a time/temperature control which includes a

field--selectable time period (DIP switch 1 and 2 on the board)

between defrost cycles of 30, 60, 90, or 120 minutes (factory set at

60 minutes). To initiate a forced defrost, two options are available

depending on the status of the defrost thermostat.

48VR-- A

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