CeilAir DX Series Operator's Manual Page 34
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CeilAiR OHS Series Installation, Operation & Maintenance Manual
A
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.
- (Mar, 2012) 1
- MODEL NOMENCLATURE 2
- OHS-040-G-FC 2
- TABLE OF CONTENTS 3
- TABLE OF CONTENTS (Continued) 4
- 1.0 Introduction 5
- 1.4 Product Warranty 6
- 1.5 Safety 8
- 1.6 General Design 10
- 2.0 Installation 12
- CAUTION 13
- WARNING 13
- 2.6 Piping Connections 17
- 2.7.3 Optional Equipment 26
- Air Cooled Systems 33
- R22 Refrigerant 37
- R407C Refrigerant 37
- Tables 37
- 3.0 Start-Up / Commissioning 38
- 3.3 Thermostat Programming 39
- Program Schedule 40
- appears on the display 41
- 4.0 Maintenance 45
- 4.3 Field Service 50
- 5.0 Product Support 53
- Appendix A - Forms 55
- Appendix B – Glossary 59
- OCH0006-B; March, 2012 60
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