Quincy Compressor QPHT 20 User manual

HIGH TEMPERATURE REFRIGERATED DRYER
OPERATOR‘S MANUAL
QPHT 20

DATE OF PURCHASE:
MODEL:
SERIAL NO.:
Record above information from nameplate.
Retain this information for future reference.

July 2004
1
TABLE OF CONTENTS
Page
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Receiving – Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Disclaimer of Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Model QPHT-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Model QPHT-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Model QPHT-60/80/100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Maintenance & Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Model QPHT-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Model QPHT-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Model QPHT-60/80/100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2
July 2004
GENERAL INFORMATION
Quincy Models QPHT-20, 40, 60, 80 and 100 High
Temperature Refrigerated Dryers are designed to cool and
remove moisture from compressed air. The units cool air in
two stages. Compressed air enters the system at a
temperature near 180°F and is cooled in an aftercooler by
ambient air. It is further cooled in an air to refrigerant heat
exchanger to about 40°F. Once cooled, the air is sent
through an automatic draining moisture separator and
finally through an oil filter.
When properly installed, the units require little
maintenance or adjustment. A list of service parts is
provided on Page 10. Contact Quincy or your Quincy
distributor for repair or replacement of other parts on
these units.
This manual contains important safety information. Read
THOROUGHLY and follow the Safety Instructions provided
in this manual and posted on the unit. Keep this manual
near the unit and in a safe place. Replace this manual if it
becomes torn or dirty and cannot be properly used.
Please read the Operating Instructions section of this
manual before attempting to operate the unit.
Please read the Maintenance & Adjustments and
Troubleshooting sections of this manual before beginning
any maintenance or service work on this unit.
Contact Quincy or your Quincy distributor before
performing any service or maintenance work NOT
discussed in this manual.
RECEIVING – INSPECTION
Inspect equipment. Any concealed shipping
damage must be reported to the carrier
immediately. Damage claims should be filed by
the consignee with the carrier.
All the equipment shipped F.O.B. factory becomes the
property of the purchaser. In all cases of damage, visible
or suspected, contact your local distributor or Quincy
before attempting to install equipment.
SERVICE INQUIRIES: Provide Model No., Serial No.,
Operating Pressure, Inlet Temperature, Nature of Problem.
See Dryer Specification Tag located on the control panel.
SAFETY INSTRUCTIONS
When using air compressors and compressed air
accessories, basic safety rules and precautions must
always be followed, including the following:
1. READ ALL INSTRUCTIONS FULLY.
2. WIRING & BREAKERS
Wiring, breakers and other electrical equipment
must conform to local and national electrical codes.
Do not operate this unit with damaged wiring or
after the unit or air handling parts have been
dropped or damaged in any manner. Notify
authorized service facility for examination, repair
or other adjustments.
3. COALESCING OIL FILTER – CHANGING AND
REMOVING
Shut off power and discharge all pressure from this
unit and air system before removing or adding parts
or attachments and before maintaining unit.
4. INSPECT HOSES
Regularly inspect hoses and load handling fittings for
signs of damage, deterioration, weakness or
leakage. Do not use if a defect is found. Remove
part from service and repair or discard defective
parts. Keep hoses away from sharp objects,
chemical spills, oil, solvents and wet floors. All of
these can damage a hose.
5. USE SUITABLE PARTS & ACCESSORIES
Do not use air pressurized accessories or parts in the
air system not suitable for the maximum air pressure
used. Be sure maximum pressure specified by the
accessory manufacturer is well above the working
pressure of your compressor.
DO NOT install, operate, maintain, adjust or
service this unit without thoroughly reading
this manual.
Comply with the National Electrical Code,
Federal, State and Local Codes when
installing or operating this unit.

July 2004
3
6. RELEASE AIR PRESSURE SLOWLY
Fast moving air will stir up dust and debris, which
may be harmful. Release air pressure slowly when
depressurizing your system to avoid bodily injury.
7. SECURE DRAIN LINES
Fasten drain lines to floor or drain. Pressurized air
may periodically pass through drain lines, which will
cause an unsecured line to whip and may cause
bodily injury.
To provide safe, breathable air, compressor must be
capable of producing at least Grade D breathing air as
described in Compressed Gas Association Commodity
Specification G7.1-1966. Special filtering, purifying and
associated alarm equipment must be used to convert
compressed air to “Breathing Air.” Other special
precautions must also be taken.
Refer to OSHA 29 CFR 1910.134.
READ THESE INSTRUCTIONS THOROUGHLY BEFORE
USING THIS UNIT.
DISCLAIMER OF WARRANTY
If this unit is used to produce breathing air, the special
equipment and precautions expressed in OSHA 29 CFR
1910.134 for specifications of the necessary equipment
and special precautions to make Breathing Air MUST BE
used or any warranties are VOID and manufacturer
disclaims any liability whatsoever for loss, personal injury
or damage.
IF USED FOR SPRAYING
• Follow all labels and printed instructions provided by
the manufacturer of the material being sprayed.
• Spray in an open area away from flames
and electrical equipment. Fumes are dangerous.
Spray in a well ventilated area to keep fumes from
collecting and causing health and fire hazards.
• Do not spray in vicinity of open flames or other areas
where a spark can cause ignition. Do not smoke when
spraying paint, insecticides, or other flammable
substances. Use a respirator when spraying.
• Always direct paint or other sprayed material away
from compressor and air dryer. Locate these units as
far away from painting area as possible to minimize
accumulation on equipment. Keep other people away
from spraying area.
Air from compressor and from Models
QPHT-20, 40, 60, 80 and 100 High Temper-
ature Refrigerated Dryers, as equipped, is
not safe for human respiration (breathing).

4
July 2004
INSTALLATION INSTRUCTIONS
NOTE: Improper installation methods of air inlet and air
outlet piping that causes internal damage to the air dryer
system will void warranty. Installer should follow proper
pipe installation practices or hire a certified plumber to
install this unit.
NOTE: Before installing the air dryer system, make sure
that the unit has at least 24 inches of clearance around all
sides and at least 24 inches of clearance on top. This is
required to provide proper air circulation to the unit. Also,
a floor drain must be provided for moisture and oil
drainage. The unit must stand above the floor drain by at
least an inch or two for proper drainage. If the floor drain
is located further from the unit than 3 Ft., obtain longer
hoses locally (refer to the installation instruction Step 6 for
proper dimensions). If it is impossible to connect the unit to
a floor drain, a container can be made to collect the
drainage. This container must have a lid to prevent the
pressurized drainage from spraying. This lid must have an
air hole to allow the air inside to escape when the
drainage is discharged.
1. Open carton and locate the coalescing oil filter and
hardware. Remove and set aside.
2. Remove unit from carton and VISUALLY inspect for
damage.
3. To install the coalescing oil filter, thread a pipe
nipple on the air outlet connection. Install the filter to
the pipe nipple with arrow on filter pointing away
from air dryer unit. Use pipe sealer on both ends of
the nipple to facilitate sealing without undue torque
pressure.
4. Connect discharge air line to filter outlet connection.
5. Connect air piping from the air compressor to the air
dryer system inlet connection. Use caution when
connecting piping to the air dryer system to avoid
twisting and damaging the air connection.
NOTE: Install brackets and support fixtures as needed to
eliminate fatigue and vibration in the air system piping.
6. Drain Connection
Models QPHT-20 and QPHT-40 are equipped with a
1/2” OD plastic moisture drain tube. The drain tube
needs to be directed to a proper drain point. A
longer drain tube or extension may be required. Be
sure to provide a secure attachment as the moisture
drain tube will periodically be under pressure.
Models QPHT-60, 80 and 100 are equipped with a
3/8” NPTF drain connection. A plastic drain tube or
copper pipe must be attached and directed to a
proper drain point. Be sure to provide a secure
attachment as the moisture tube or pipe will
periodically be under pressure.
7. Connect the grounded electrical plug to a standard
three-hole grounded outlet. If an extension cord is
necessary, use a 14 Gauge extension cord only.
Wiring must meet local and national electrical
codes.
8. The air dryer system has been tested and shipped
with a full charge of oil and refrigerant. Inspect the
suction pressure gauge located on the front of the
unit. While the unit is idle (not operating) the
Coalescing oil filter must be installed with
direction arrow facing AWAY from the air
dryer system unit. If the oil filter is
installed backwards, discharge air will be
contaminated with oil.
Moisture drain line must be tightly secured
at the drain. This line will periodically con-
tain pressurized air. An unsecured line will
whip around. Failure to secure lines can
cause bodily injury.
Air dryer unit MUST be attached to a prop-
erly wired and grounded outlet. Failure to
properly ground unit can cause electrocu-
tion. Observe all local and national electri-
cal codes.

July 2004
5
refrigerant suction pressure should be within the
following ranges.
Model QPHT-20: 55 to 125 PSIG
Model QPHT-40: 90 to 130 PSIG
Model QPHT-60: 90 to 130 PSIG
Model QPHT-80: 90 to 130 PSIG
Model QPHT-100: 90 to 130 PSIG
If the suction pressure gauge reads 0 PSIG or near 0
PSIG, contact Quincy or your Quincy dealer.
Air dryer unit will not function properly
unless all cabinet panels are in place.
Do not operate unit in an ambient temper-
ature below 40°F (4°C) or above 100°F
(38°C). If the unit has been stored over-
night or longer in temperatures below
40°F (4°C), the unit must sit for at least
eight hours at a recommended tempera-
ture before operating.

6
July 2004
OPERATING INSTRUCTIONS
1. Start the air dryer system by turning the switch to the
ON position. At this time the compressor and
cooling fans will start.
2. After the unit is running, the suction pressure will
begin to drop into the appropriate pressure range
for the particular dryer model. Normal operating
suction pressure ranges are as follows:
Model QPHT-20: 25 to 33 PSIG (Blue Range)
Model QPHT-40: 52 to 64 PSIG (Green Range)
Model QPHT-60: 25 to 33 PSIG (Blue Range)
Model QPHT-80: 25 to 33 PSIG (Blue Range)
Model QPHT-100: 25 to 33 PSIG (Blue Range)
3. Once the suction pressure stabilizes and is
maintained in the proper operating pressure range,
compressed air can be allowed to flow through the
air dryer system. At this point the air dryer system is
delivering dry air to your process.
4. If the refrigerant suction pressure is not in the proper
operating range, a hot gas bypass adjustment may
be required. See Page 9 for hot gas bypass valve
adjustment instructions.
5. Hold the PUSH-TO-TEST button on the drain controls
open for several seconds. This procedure should be
repeated 3 or 4 times in every 8 hour period of
operation.
6. The moisture drain valve operates automatically and
is controlled with the two CYCLE TIME and DRAIN
TIME knobs. Initially both knobs should be turned
counterclockwise to the seven o’clock position.
When using the unit after shipment, check both
knobs and turn to the seven o’clock position if they
have been moved. The controls are now set so that
the unit opens the drain every 1 minute (cycle time)
for a 2 second period (drain time).
After the unit has been running and the suction pressure
indicator arrow is in the blue/green zone, check the
moisture drain line. The line should drain moisture without
expelling air. After the unit has been operating, recheck
the line for proper drainage. If needed, slowly increase
the cycle and drain timings to adjust for an increased load
and to compensate for humid air conditions. Adjust cycle
and drain time if needed for proper drainage without the
loss of any compressed air.
Press the PUSH-TO-TEST button for manual override, and
to periodically clear the moisture drain of sediments or
foreign material.
7. Manually turn the coalescing oil filter drain stem
once every 8 hours of operation, or when the sight
of glass is half full of liquid. Failure to drain may
cause reentrainment.
SPECIFICATIONS
Model QPHT-20
1. Unit Dimensions:
Length: 17.50”
Width: 18.75”
Height: 17.75”
2. Flow:
20 SCFM
3. Inlet Pressure:
175 PSIG (200 PSIG Maximum)
4. Ambient Temperature:
Minimum 40°F (4°C)
Maximum 100°F (38°C)
5. Inlet Temperature:
180°F (82°C) Maximum
6. Dew Pt. Temperature:
40°F±2° (4°C±1°)
7. Refrigerant H.P.:
1/4
8. Heat Exchanger Material:
Copper
9. Automatic Drain:
Installed
10. Refrigerant:
R-134A
11. Electrical Power Supply:
115V, 60HZ, 1 phase
12. Instrumentation:
ON/OFF switch
Power-on light
High temperature light
Refrigerant suction pressure gauge
Drain test button
Drain adjustment controls (2)

July 2004
7
Model QPHT-40
1. Unit Dimensions:
Length: 28”
Width: 18”
Height: 30”
2. Flow:
40 SCFM
3. Inlet Pressure:
175 PSIG (200 PSIG Maximum)
4. Ambient Temperature:
Minimum 40°F (4°C)
Maximum 100°F (38°C)
5. Inlet Temperature:
180°F (82°C) Maximum
6. Dew Pt. Temperature:
40°F±2° (4°C±1°)
7. Refrigerant H.P.:
1/3
8. Heat Exchanger Material:
Copper
9. Automatic Drain:
Installed
10. Refrigerant:
R-22
11. Electrical Power Supply:
115V, 60HZ, 1 phase
12. Instrumentation:
ON/OFF switch
Power-on light
High temperature light
Refrigerant suction pressure gauge
Drain test button
Drain adjustment controls (2)
Model QPHT-60/80/100
1. Unit Dimensions:
Length: 28”
Width: 18”
Height: 40”
2. Flow:
QPHT-60: 60 SCFM
QPHT-80: 80 SCFM
QPHT-100: 100 SCFM
3. Inlet Pressure:
175 PSIG (200 PSIG Maximum)
4. Ambient Temperature:
Minimum 40°F (4°C)
Maximum 100°F (38°C)
5. Inlet Temperature:
180°F (82°C) Maximum
6. Dew Pt. Temperature:
40°F±2° (4°C±1°)
7. Refrigerant H.P.:
QPHT-60: 1/2
QPHT-80: 3/4
QPHT-100: 3/4
8. Heat Exchanger Material:
Stainless Steel & Copper
9. Automatic Drain:
Installed
10. Refrigerant:
R-134A
11. Electrical Power Supply:
115V, 60HZ, 1 phase
12. Instrumentation:
ON/OFF switch
Power-on light
High temperature light
Refrigerant suction pressure gauge
Drain test button
Drain adjustment controls (2)

8
July 2004
MAINTENANCE & ADJUSTMENTS
1. The ON/OFF switch holds a HIGH TEMP light which
will turn on if the unit’s compressor system
malfunctions. If the red HIGH TEMP light on this
switch is illuminated, turn off and unplug the unit for
15 minutes and restart. If the light remains on after
restarting or it continues to turn on afterwards,
contact Quincy or your distributor.
2. Periodic maintenance . The following procedures
should be performed every six months to insure that
the air dryer unit operates properly. These steps
should be performed more frequently if either the air
compressor or the air dryer is exposed to air that is
dirtier or dustier than normal.
a. Clean ambient filter (QPHT-20 models only).
b. Clean coalescing oil filter drain assembly
c. Replace coalescing oil filter element
d. Clean moisture separator drain assembly
e. Clean Particle Strainer
f. Clean condenser/air cooler coil.
3. Ambient filter cleaning (QPHT-20 models
only). Remove ambient filter from the air dryer
system unit and simply flush the filter in a stream of
water to remove any dust and dirt. Allow filter to dry
and spray on a filter coat adhesive to help trap dust
and dirt. If the ambient filter will not come clean,
replace with new filter. Refer to Page 10 to order
ambient filters or the filter spray-on coat adhesive.
Replace ambient filter with the arrow on the filter
pointing towards the unit for proper air flow through
the filter and into the unit.
4. Coalescing oil filter. The filter is equipped with a
pressure differential indicator. The indicator should
be inspected periodically each 24 hour period. If the
indicator is at or above the midpoint on the gauge,
the filter element should be replaced and the drain
assembly cleaned. Filters for models QPHT-20 and
QPHT-40 are equipped with a ball type indicator
gauge. Filters for models QPHT-60, QPHT-80 and
QPHT-100 are equipped with a numeric color type
indicator gauge.
a. Depressurize the air system to release
compressed air from the air dryer system. Shut
down the air compressor AND the air dryer
system, and discharge the air through the sprayer
or other output device. Shutting down the air
compressor or unit only will not depressurize the
air dryer system.
b. Remove the filter bowl, the bottom half of the
assembly, by turning the bowl counterclockwise.
c. Clean the bowl and the drain stem with water
and a mild soap solution.
NOTE: When reinstalling the filter bowl, make sure the O-
ring is in place on the top half of the filter housing and that
the O-ring seats properly. Air leaks may occur if O-ring is
not seated.
d. Inspect the coalescing oil filter every 6 months
and replace element as necessary. Refer to Page
10 to order a filter element.
e. If the drain is clean and the filter still will not
drain, contact Quincy or your distributor to order
a new filter assembly.
5. Moisture separator drain cleaning. If after
using the PUSH-TO-TEST button to clear sediment or
foreign objects from the moisture drain, the drain still
appears to be clogged, depressurize the air system
to release compressed air from the air dryer unit.
Shut down the air compressor AND the air dryer
unit, and discharge the air through the sprayer or
other output device. Shutting down the air
compressor unit only, will not depressurize the air
dryer unit.
a. Remove the screws attaching the left side panel
to the cabinet and remove the panel.
Depressurize air dryer system before
removing coalescing oil filter bowl. Failure
to do so will cause the filter to blow off its
fitting and cause bodily injury and prop-
erty damage.
Depressurize air dryer system before
removing moisture separator bowl. Fail-
ure to do so will cause the separator to
blow off its fitting and cause bodily injury
and property damage.

July 2004
9
b. Remove compression fitting on the elbow
attached to the particle strainer of the separator
assembly by turning the hex head nut on the
fitting. Remove the plastic tubing connecting the
particle strainer and the drain valve solenoid.
c. Close the shut-off valve on the particle strainer,
drain the down stream line of the particle strainer
with the PUSH-TO-TEST button on the auto drain.
Unscrew and clean out screen, replace screen
and open shut-off valve.
d. Remove lower bowl bracket by unfastening the
two machine screws and nuts that hold the lower
bracket to the back panel.
e. Turn the separator bowl counterclockwise to
remove. A pipe wrench may be necessary to
remove the bowl.
NOTE: When reinstalling the separator bowl, make sure
the O-ring is in place on the top of the bowl and that the
O-ring seats properly on the separator housing. Air leaks
may occur if O-ring is not seated.
f. Clean the bowl assembly with a mild soap
solution and cold water.
g. Inspect the drain hoses for any kinks. Remove the
drain hose inside the air dryer system and the
drain hose outside the unit and blow into the line
to clear any sediment or foreign material from the
lines.
h. Reinstall the moisture separator bowl, the lower
filter bracket, the particle strainer assembly, and
the two drain hoses. If the separator still will not
drain, contact Quincy or your distributor to order
a new separator assembly.
6. Condenser coil cleaning. Remove ambient filter
(if equipped). Remove either the right or left side
panel screws and panel. Using compressed air,
blow collected dust and contamination off condenser
from inside to outside.
7. Hot gas bypass valve adjustment. The hot
gas bypass valve adjustment regulates the flow of
refrigerant through the air cooling system to maintain
the proper suction pressure. The suction pressure
must be maintained within the proper range for
normal operation. The needle on the refrigerant
suction pressure gauge should be in the blue or
green zone depending on your air dryer system
model.
a. Hot gas bypass valve adjustments must be made
while the unit is operating. DO NOT TURN THE
UNIT OFF.
b. Remove the left side panel on the cabinet. The
hot gas bypass valve adjustment nut is located on
the refrigerant discharge line near the
compressor.
c. For Model QPHT-40: If the suction pressure
gauge indicator arrow is below 52 PSIG, turn the
adjusting nut CLOCKWISE. If the suction pressure
gauge indicator needle is above 64 PSIG, turn
the adjusting nut COUNTERCLOCKWISE. Let the
unit operate for a few minutes and read the
suction pressure gauge again. Continue to adjust
the valve until the indicator arrow is in the
GREEN ZONE between 52 PSIG and 64 PSIG.
Adjust only 1/4 of a turn at a time. ALLOW 4 – 5
MINUTES BETWEEN ADJUSTMENTS.
d. For Models QPHT-20, QPHT-60, QPHT-80,
QPHT-100: If the suction pressure gauge
indicator arrow is below 25 PSIG, turn the
adjusting nut CLOCKWISE. If the suction pressure
gauge indicator needle is above 33 PSIG, turn
the adjusting nut COUNTERCLOCKWISE. Let the
unit operate for a few minutes and read the
suction pressure gauge again. Continue to adjust
the valve until the indicator arrow is in the BLUE
ZONE between 25 PSIG and 33 PSIG. Adjust
only 1/4 of a turn at a time. ALLOW 4 – 5
MINUTES BETWEEN ADJUSTMENTS.
The air dryer system will not operate
properly unless all panels are reinstalled
after any maintenance work.

10
July 2004
SERVICE PARTS
Model QPHT-20
1. Coalescing oil filter element
C-25-10-A
2. Coalescing oil filter manual drain valve
VA-000761
3. Moisture separator auto drain valve
VA-003111 (115V)
4. Drain timer board
EC-000486 (115V)
5. ON/OFF switch power-on & high temp light
RF-001983
6. Refrigerant suction pressure gauge
GM-000318
7. Condenser fan motor
RF-001280 (115V)
8. Condenser fan blade
RF-000538
9. Ambient filter (1 set)
RF-000811
10. Ambient filter Coat Adhesive
RF-000874
Model QPHT-40
1. Coalescing oil filter element
C-25-10-A
2. Coalescing oil filter manual drain valve
FH-000494
3. Moisture separator auto drain valve
VA-000285
4. Drain timer board
EC-000486
5. ON/OFF switch power-on & high temp light
RF-001983
6. Refrigerant suction pressure gauge
GM-000318
7. Condenser fan motor
RF-000794
8. Condenser fan blade
RF-000774
Model QPHT-60/80/100
1. Coalescing oil filter element
C-60-15
2. Coalescing oil filter manual drain valve
FH-000149
3. Moisture separator auto drain valve
VA-000285
4. Drain timer board
EC-000486
5. ON/OFF switch power-on & high temp light
RF-001983
6. Refrigerant suction pressure gauge
GM-000318
7. Condenser fan motor
RF-000794
8. Condenser fan blade
RF-000774

July 2004 11
TROUBLESHOOTING
Table 1 — Troubleshooting Guide
Symptoms Cause Remedy
A. Moisture downstream. 1. Refrigeration compressor not
running.
2. Suction pressure reads above
blue/green zone.
3. Moisture separator auto drain
malfunction.
a. Check electric power supply.
b. If red light is on, call for factory
service.
a. Clean the air cooled condenser
(see Page 8).
b. Adjust hot gas bypass valve (see
Page 9).
c. Check for defective fan motor and
replace.
a. Check the auto drain operation
(see Page 8).
b. Check for clogged drain line from
auto drain outlet to floor drain.
c. Check the electronic timer for
loose wires or evidence of burn
out.
B. Oil downstream. 1. Oil filter malfunction.
2. Filter element dirty.
a. Check the drain operation.
b. Clean the drain if stuck or
clogged.
c. Check the drain manual valve for
clogging.
a. Replace element (see Page 8).
C. Low air pressure downstream. 1. Suction pressure below blue/
green zone. This causes freeze-up
in the air systems.
a. Adjust hot gas bypass valve (see
Page 9).
b. Low on refrigerant. Call for
service.
c. To confirm freeze-up, shut off the
unit for 15 minutes. Air pressure
should come back to line pressure.
D. Continuous air flow through the
moisture drain line.
1. Foreign materials lodged on the
valve seat.
2. Short-circuited timer board.
3. Short-circuited PUSH-TO-TEST
switch.
4. Defective solenoid valve.
a. Press the PUSH-TO-TEST switch
several times.
b. Disconnect the drain lines to the
solenoid valve and blow
compressed air from outlet while
pressing the PUSH-TO-TEST
switch.
a. Replace.
a. Replace.
a. Replace.

12 July 2004
E. Moisture is not draining. 1. Clogged solenoid valve.
2. Defective timer board.
3. Defective solenoid valve.
4. Clogged drain lines.
a. Press the PUSH-TO-TEST switch
several times.
b. Disconnect the drain lines to the
solenoid valve and blow
compressed air from outlet while
pressing the PUSH-TO-TEST
switch.
a. Replace.
a. Replace.
a. Clean or replace.
F. Oil filter not draining. (Oil level
seen above half way point through
the bowl sight glass.)
1. Defective drain valve.
2. Plugged drain valve.
a. Replace.
b. Clean in soap and water or
replace.
Table 1 — Troubleshooting Guide
Symptoms Cause Remedy