CeilAir DX Series Instrukcja Operatora Pobierz pdf (Strona 34)

(Mar, 2012)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

2-23

This method of controlling head pressure allows the

condenser fan to run continuously. While the fan is

running, the ﬂ ooded head pressure control valve

modulates the amount of discharge gas entering the

receiver. As the pressure increases, the valve diverts

more discharge gas to the condenser, allowing more

liquid to ﬂ ow from the condenser to the receiver.

When using this method of head pressure regulation

there must be enough refrigerant in the system to

ensure adequate charge at the lowest expected am-

bient temperature in which the system will be operat-

ing. A receiver is used to store the extra refrigerant

when the condenser is not using it.

NOTE

Systems utilizing air cooled condensers must

not have a refrigerant line pressure drop

greater than 14 psig across the condenser and

the interconnecting piping to the condenser

sections.

2.9.2.6 Flooded Head Pressure Control

(Condenser Model HES-CAA ,- 30°F)

Used for indoor installations where ambient con-

denser air inlet temperatures may fall to -30°F. First,

familiarize yourself with Flooded Head Pressure

Control as discussed in Section 2.8.4.5. Instead of

cycling the fan on and off, the condenser fan speed is

continuous. The head pressure control valve diverts

discharge gas to the receiver causing liquid to back

up in the condenser, as described in Section 2.8.4.5,

while the fan continues to run.

2.9.3 Head Pressure Controls-

Water/Glycol Cooled Systems

In a water/glycol condenser, condensing

temperature is maintained by the liquid ﬂ owing

through a regulating valve and then into a liquid-

cooled condenser. The regulating valve opens to

increase the liquid ﬂ ow as the refrigerant pressure

rises (or closes as the refrigerant pressure falls).

The regulating valve is factory set for the correct

condensing temperature, however, it can be adjusted

to increase or decrease the condensing temperature.

Head pressure regulating valves are available in

2-way or 3-way conﬁ gurations. Refer to the piping

diagram to determine which type of valve is provided.

The location and size of regulating valves varies

with the size and model of the A/C unit. Methods for

adjusting the valves for condensing pressure differ

with the valve types which can be differentiated by

the maximum water pressure rating of the valve,

(150, 350, or 450 psig).

2.9.3.1 150 PSIG Pressure Valves

Adjustment is made by turning the slotted square

stem on top of the valve clockwise to increase

the condensing temperature or decrease water/

glycol ﬂ ow and counterclockwise to decrease the

condensing temperature or increase the water/glycol

ﬂ ow. A directional arrow is stamped on the metal

housing of the valve stem.

2.9.3.2 350 PSIG and 450 PSIG High

Pressure Valves

Adjustment is made by turning the round-holed knob

counterclockwise inside the valve’s metal housing

to increase condensing pressure or decrease water/

glycol ﬂ ow and clockwise to decrease the condensing

temperature or increase the water/glycol ﬂ ow. A

directional arrow is stamped on the metal housing of

the valve stem.

2.9.4 Humidiﬁ er Adjustment

The humidiﬁ er has a capacity adjustment potenti-

ometer on the humidiﬁ er control circuit board. The

capacity potentiometer may need to be ﬁ eld adjusted

if the humidiﬁ er does not supply enough capacity for

the current room conditions.

CAUTION

Adjusting the capacity pot too high may result

in condensation within the system.

It is recommended that if the capacity potentiometer

requires adjustment, the adjustment is made in

small increments and veriﬁ ed. Refer to the humidiﬁ er

manual sent with your unit for the location of the

capacity potentiometer.

2.9.5 Blower Adjustment

2.9.5.1 Belt Drive Blower (see Figure 13)

Systems with belt drive blowers are supplied with

adjustable sheaves to change the blower speed and

adjustable motor bases for belt tensioning. Follow the

following procedure to change the blower speed.

1. Turn system off.

2. Turn off all power to unit at non-fused service

switch, use lock-out tag-out procedure.

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