DUOTEC AHV120017 Manuale d'uso e installazione - Pagina 11

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OWNER'S MANUAL INSTALLATION INSTRUCTIONS

F. CONTINUOUS FAN

Select the desired Continuous fan speed when thermostat is set on

continuous fan operation by using the Yellow jumper wire.

NOTE: If installed with a two-stage outdoor unit, do not select HI

speed continuous fan. If HI is selected, low stage compression (low-

speed cooling) will also run HI fan speed possibly resulting in

insufficient dehumidification.

1. LO speed - factory setting, approximately 50% cooling mode

airflow.

2. MED speed - move connector to MED, approximately 65%

cooling mode airflow.

3. HI speed - move connector to HI, approximately 100% cooling

mode airflow.

G. LOW-VOLTAGE CIRCUIT

(FUSING AND REFERENCE)

The low-voltage circuit is fused by a board-mounted 5-amp

automotive fuse placed in series with the transformer SEC2 and the

R circuit. The C circuit of the transformer is referenced to chassis

ground through a printed circuit run at SEC1 connected to metal

standoff marked with ground symbol.

H. QUICK SET UP

(BASIC AIR HANDLER CONFIGURATION)

The following basic configuration of the air handler will provide best

performance of an Air Conditioner:

1. AUX HEAT KW/CFM - Select the heater range for the size

electric heater installed.

2. OUTDOOR UNIT SIZE - Select system size installed.

3. SYSTEM TYPE - Select system type AC.

4. AC/HP CFM ADJUST - Select NOM.

5. ON/OFF DELAY - Select 0/90 profile.

6. CONTINUOUS FAN - Select desired air handler when thermostat

is set to continuous fan.

The following basic configuration of the air handler will provide ARI

rated performance of a Heat Pump:

1. AUX HEAT KW/CFM - Select the heater range for the size

electric heater installed.

2. OUTDOOR UNIT SIZE - Select system size installed.

3. SYSTEM TYPE - Select system type HP-EFF.

4. AC/HP CFM ADJUST - Select NOM.

5. ON/OFF DELAY - Select 0/90 profile.

6. CONTINUOUS FAN - Select desired fan speed when thermostat

is set to continuous fan.

ACCESSORIES

AUXILLIARY TERMINALS

The Fan Control Board contains the following auxiliary terminals,

refer to Figure 6.

HUM1 and AUX1 are in common with SEC1, and thermostat

common.

HUM2 and AUX2 terminals are tied directly to the G terminal from

thermostat, and provide a 24 VAC hot signal whenever the G terminal

is energized.

HUMIDIFIER OPERATION WITH HUMIDISTAT

A standard humidistat can be used to operate a humidifier. The

HUM1 is internally connected to 24V Common (C), and HUM2 is

internally connected to (G). Refer to Figure 12 for typical Humidifier

wiring layout using HUM1 (C), and HUM2 (G).

Alternately, the 24VAC signal may also be sourced from the W1 and

Com (thermostat pigtail) connections when electric heaters are used

as a primary heating source (refer to Figure 13).

NOTE: When using a thermostat with built-in humidity control, the

above auxiliary terminals can be ignored, and the humidifier may be

sourced directly from humidity terminals located on the thermostat

itself.

DEHUMIDIFY CAPABILITY

The J1 jumper should always be removed from the Fan Control

Board for proper airflow operation.

Latent capacities for systems using the AHV are better than average

systems. If increased latent capacity is an application requirement,

the field wiring (thermostat pigtail) connections provides a (Dh) for

use with a standard humidity sensor/control (Refer to Figure 14 for

additional latent control). The AHV will detect a closed contact

between R and Dh (closing on a humidity rise) and reduce its airflow

to approximately 80% of nominal cooling mode airflow. This reduction

will increase the system latent capacity until the humidity falls to a

level which causes the humidity sensor/control to open its contacts.

When the contacts open, the airflow will return to 100% of the

selected cooling airflow. Refer to Figure 15 for Normal Airflow

Operation.

Figure 12

Figure 13

Humidifier Wiring for Electric Heat Primary

Figure 14

Figure 15

HEATER STAGING

The AHV modular fan control board is factory set for single-stage

electric heat operation. Refer to Table 3 for available heaters.

When two-stage electric heat is desired, the J2 jumper must be

removed. Refer to Table 3-2 for two-stage compatible heaters.

Removing J2 will allow second stage control by the indoor wall

thermostat (if multi-stage capable).

DUOTEC AIR HANDLER: AHV

Humidify

Humidifier Wiring

Heating Source

De-Humidify

Additional Latent Control

Normal Airflow Operation