Venstar ACC0431 Dokumentacja Pobierz pdf (Strona 23)

Winter Start Control (part number KAAWS0101AAA) is

required when low ambient operation (cooling below 55_F/13_C)

is required for cooling and heat pump models (018-- 060) that have

a low pressure switch.

The Winter Start Control kit uses a time--delay relay to bypass the

low--pressure switch for three (3) minutes on start--up. the time

delay relay will take the low pressure switch out of the control

circuit to allow the system to build pressure eliminating nuisance

trips. Units with low pr essur e switches: 38HDR/HDF/QRR/QRF

and 538A_B/E_F, 538Q_F.

Crankcase Heater is required for low ambient operation and must

be added. This is a separate accessory to be installed.

These instructions cover the installation of low ambient

temperature control accessory kit on the duct--free cooling and heat

pump condensing units.

The low ambient temperature control (LAC) is a high cycle rate

pressure switch that directly controls the outdoor fan motor.

The low ambient temperature control is designed to maintain a

condensing pressure of 255 to 295 psig on models 38MVC/MVQ

and 321 to 362 psig fo r HDF/HDR and QRF/QRR models by

directly cycling the outdoor-- fan motor. No field adjustments or

calibrations are required.

When unpacking the accessory , carefully inspect for shipping

damage. If damage is evident, return for replacement.

INSTALLATION

For 38HDR/QRR Models

1. Remove access panels and locate pressure tap on liquid

header .

2. Place three drops of compressor oil in the pressure switch

for lubrication.

3. Mount switch as shown in Fig. 1.

4. For heat pump units only, mount isolation relay in control

box.

5. Connect wiring as shown in Fig. 3 or Fig. 4.

6. Coil any excess wire and secure next to the pressure switch.

For 38MVC/MVQ Models

1. All of the components required for the correct installation of

the low ambient control are included in the kit.

2. Remove access panels and locate pressure tap on liquid line.

3. Place three drops of compressor oil in the pressure switch

for lubrication.

4. Mount switch as shown in Fig. 2.

5. For heat pump units only, mount isolation relay in control

box.

6. Determine locations for electrical connections (see Fig. 3 or

Fig. 5).

7. Cut pressure switch leads to correct length and apply the re-

quired terminations from the selection supplied in the low

ambient control kit.

8. For heat pump units only, use the cut off lead and termina-

tions supplied with the kit to make up the required field

wiresasshowninFig.5.

LOW AMBIENT CONTROL

PRESSURE SWITCH

PRESSURE TAP ON

COIL LIQUID HEADER

D06005

Fig. 1 -- Representative of 38HDR/38QRR OR 538A/538B

Models

LOW AMBIENT CONTROL

PRESSURE SWITCH

PRESSURE TAP ON

COIL LIQUID LINE

A08046

Fig. 2 -- Representative of 38MVC/38MVQ Models

53DS-- 900-- -- -- 086, 095

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 36 37

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