Greenheck DGX User manual

1
Packaged DX Module for Make-Up Air
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble,
install, operate or maintain the product described. Protect yourself and others by observing all safety
information. Failure to comply with instructions could result in personal injury and/or property damage!
Only qualified personnel should install and maintain
this system. Personnel should have a clear
understanding of these instructions and should
be aware of general safety precautions. Improper
installation can result in electric shock, possible injury
due to coming in contact with moving parts, as well as
other potential hazards. Other considerations may be
required if high winds or seismic activity are present.
If more information is needed, contact a licensed
professional engineer before moving forward.
1. Follow all local electrical and safety codes, as
well as the National Electrical Code (NEC), the
National Fire Protection Agency (NFPA), where
applicable. Follow the Canadian Electric Code
(CEC) in Canada.
2. Unit must be securely and adequately grounded.
3. Verify that the power source is compatible with
the equipment.
4. Never open access doors to the unit while it is
running.
General Safety Information
DANGER
• Always disconnect power before working on or
near this equipment. Lock and tag the disconnect
switch or breaker to prevent accidental power up.
• If this unit is equipped with optional gas
accessories, turn off gas supply whenever power
is disconnected.
CAUTION
This unit is equipped with a compressed refrigerant
system. If a leak in the system should occur,
immediately evacuate and ventilate the area. An
EPA Certified Technician must be engaged to make
repairs or corrections. Refrigerant leaks may also
cause bodily harm.
CAUTION
When servicing the unit, the internal components
may be hot enough to cause pain or injury. Allow
time for cooling before servicing.
Recognized Component
®
®
Part #474681
Packaged DX Module
As used in Greenheck models
•DGX
•IGX
•MSX

2Packaged DX Module for Make-Up Air Unit
Receiving
This Packaged DX Module is installed as a component
of a make-up air unit and does not require any special
handling. Refer to the Receiving portion of the unit
IOM for complete instructions on receiving, unpacking
and handling.
Unpacking
The Packaged DX unit is shipped as a complete
installed unit. Protective coverings have been installed
on the face of the condenser coil that should be left in
place until installation of the unit is complete. The only
item that was shipped loose with the unit is the P Trap
kit (see below right). Verify that the P Trap kit has been
received. Refer to Unpacking instructions in unit IOM.
Handling
Units are to be rigged and moved by the lifting
brackets provided. Do not forklift. Refer to the
Handling portion of the unit IOM for complete
instructions on handling.
Hoisting
All units equipped with a Packaged DX Module are
provided with either four or six lifting lugs. When the
unit is being hoisted, all of the provided lugs must
be used for support. Four lifting lugs are on the four
corners of the unit, located at the base. In addition,
there may be two more lifting lugs located at the top
of the unit. The locations of those two top lugs varies
somewhat from unit to unit. Use spreader bars to
prevent damage to the cabinet.
Use spreader bars as shown to prevent damage to the
cabinet. If top-mounted lifting lugs are present, they
must be used in conjunction with the bottom-mounted
lifting lugs when hoisting the unit.
Use lifting lugs on
all four corners.
Lifting Details
Table of Contents
Receiving ...................................2
Unpacking...................................2
Handling ....................................2
Hoisting.....................................2
Storage .....................................3
Inspection and Maintenance During Storage .......3
Models and Capacities ........................3
Model Number ...............................3
Installation Issues
Provide and Install Switch S4 .................3
Install Condensate Drain (P Trap) ..............3
Service Clearances..........................3
Additional Clearances for Packaged DX Units ....3
Product Overview.............................4
Compressed Refrigerant .....................4
Safety Listing ..............................4
Supplemental Installation, Operation and
Maintenance Manuals .......................4
Subassemblies ...............................4
Coils .....................................4
Dampers ..................................4
DX System ................................4
Factory Installed Refrigeration System
Components ...............................5-6
Compressor Compartment Components ..........7
Additional Control Components ...............7
Typical Wiring Diagram ......................8-9
Component Locations ........................10
Sequence of Operation .......................10
Control Sequence..........................10
Control Sequence/Variable Air Volume (optional). 11
Pre Start-Up
Pre Start-Up Checklist ......................11
Special Tools Required: .....................11
Start-Up Checklist ......................11-12
Electrical Start-Up Checklist .................12
Refrigeration System Start-Up Checklist .......12
Troubleshooting - Refrigeration Circuit........13-16
Routine Maintenance .........................17
Monthly ..................................17
Annually .................................17
Maintenance Log .........................18-19
Warranty ...................................20
®

3
Packaged DX Module for Make-Up Air Unit
Storage
Units are protected against damage during shipment.
If the unit cannot be installed and operated
immediately, precautions need to be taken to prevent
deterioration of the unit during storage. The user
assumes responsibility of the unit and accessories
during storage. The manufacturer will not be
responsible for damage during storage. The following
suggestions are provided solely as a convenience to
the user.
Inspection and Maintenance During
Storage
While in storage, inspect units once per month. Keep
a record of inspection and maintenance performed. If
moisture or dirt accumulations are found on the parts,
the source should be located and eliminated. At each
inspection, rotate all moving parts by hand ten to
fifteen revolutions to distribute lubricant on motor and
bearings. If paint deterioration begins, consideration
should be given to touch-up or repainting. Units with
special coatings may require special techniques for
touch-up or repair.
Machined parts coated with rust preventative should
be restored to good condition promptly if signs of
rust occur. Immediately remove the original rust
preventative coating with petroleum solvent and clean
with lint-free cloths. Polish any remaining rust from the
surface with crocus cloth or fine emery paper and oil.
Do not destroy the continuity of the surfaces. Wipe
clean thoroughly with Tectyl® 506 (Ashland, Inc.) or
the equivalent. For hard to reach internal surfaces or
for occasional use, consider using Tectyl® 511M Rust
Preventative or WD-40® or the equivalent.
Models and Capacities
The Packaged DX Module for Make-Up Air Units is
manufactured in three different platform sizes, each
of which has several
different output tonnage
options. Examine
shipping documents to
verify correct model of
the module as received.
Model Number
A metal plate is located on the fixed panel access
to the control center. The plate is marked with the
Platform Type and Tonnage (for example, H12-6).
Record the model number here:
Installation Issues
Provide and Install Switch S4
Each Packaged DX unit requires an On/Off switch to
enable the unit to run. This is a user supplied switch
that may be a toggle switch mounted in a 2 x 4 inch
electric box (mounted in a position chosen by the
user), or it may be a simple jumper or even a control
switch installed in a remote control panel supplied by
the factory. See also “Additional Control Components”
on page 7 of this manual.
Install Condensate Drain (P Trap)
The only installation step that
is specific to the DX module is
installation and priming of the
engineered P trap. Locate the
P trap kit that was shipped
with the unit and install the
kit in accordance with the
enclosed instructions.
Service Clearances
All make-up air units require minimum clearances on
all sides for routine maintenance. Filter replacement,
drain pan inspection and cleaning, fan bearing
lubrication and belt adjustment are all examples of
routine maintenance that must be performed. Blower
and motor assemblies and coil and filter sections
are always provided with a service door or panel for
proper component access. Clearances for component
removal may be greater than the service clearances.
Refer to submittal drawings for these clearance
dimensions. See also Page 4 of this manual.
Additional Clearances for Packaged DX
Units
Packaged DX units require additional service
clearance because they must have unrestricted
air movement around the condenser coil and
condenser fans. Hot air is being discharged from
the condenser fans during operation and the more
clearance available, the better the chance of avoiding
recirculation or coil starvation. This unit should never
be placed under an overhang or inside a building. A
minimum of 48 inches above the condenser fans is
recommended. See Page 4 of this manual.
Platform Tonnage
H12 3,5,6,8
H22 7,9,10
H32 10,12,16
®

4Packaged DX Module for Make-Up Air Unit
Clearances (continued)
Product Overview
The Greenheck Packaged DX Module for make-up
air is a horizontally configured unit that is installed as
a package in make-up air units and is designed for
outdoor installations. The Packaged DX Module is
used to temper the air that is supplied to the building.
The make-up air unit is designed to provide sufficient
air to replace air that is exhausted from the building
and this module is designed to provide necessary
cooling.
The DX system comes fully charged with R-410A
refrigerant from the factory and is ready for operation
upon arrival.
Units may be supplied with one or two compressors
based on required cooling capacity. All units
with multiple compressors allow for staging of
compressors to meet a wider range of outdoor
air loads while reducing the number of cycles per
compressor.
Compressed Refrigerant
All packaged DX modules are charged with
environmentally friendly R-410A compressed
refrigerant. Do not use tools or parts designed for
other refrigerants on this unit.
Safety Listing
Make-up air units are listed per ANSI/UL 1995, Heating
and Cooling Equipment and are ETL Certified.
Supplemental Installation, Operation and
Maintenance Manuals
Refer to the Installation, Operation and Maintenance
manual for the Make-Up Air unit for additional
information.
Subassemblies:
Coils
Every module is supplied with a single DX evaporator
coil. If there is only one cooling circuit, then the
DX coil is not divided. If two cooling circuits are
specified, then the DX coil will be a split-face. A
single condensor coil is attached to the exterior of the
module. If more than one cooling circuit is present,
that condensor coil will be of split-face configuration.
Dampers
There is only one damper that may be installed in a
PDX module. That is an inlet damper and it will only
be found when the module is installed in either a
Greenheck model IGX or MSX that was not ordered
with an inlet damper module.
DX System
The DX system in the module is a complete, sealed
unit with compressed R-410A refrigerant. It consists of
one or two compressors, evaporator and condenser
coils and the following integral components:
• expansion valves
• liquid line lter-drier
• service / charging valves
• moisture indicating sight glass
• crankcase heater on each compressor
Each DX system incorporates the following:
• high pressure manual reset cutout
• low pressure auto-reset cutout
Outdoor
Air Intake
Unit Control Center
Condenser Fans
and
Condenser Coil
Indirect Gas-Fired
Furnace
42 inches clearance
42 inches clearance
48 inches clearance
36 inches clearance
End view of make-up air unit
with Packaged DX
END VIEW OF MAKE-UP AIR UNIT
WITH PACKAGED DX
Minimum 48 inches clearance
Minimum 42 inches
clearance
Condenser Coil
Condenser Fans
®

5
Packaged DX Module for Make-Up Air Unit
Factory Installed Refrigeration System Components
1. Thermostatic Expansion Valve (TXV)
Each unit is equipped with a Thermal
Expansion Valve on each refrigerant
circuit. The valve controls the flow
of liquid refrigerant entering the
evaporator coil by maintaining a
constant, factory set superheat of
10°F. The valve is adjustable and is
located on the side of the evaporator
coil and can be accessed through the
coil panel access door.
2. Refrigerant Distributor
Attached to the TXV is a refrigerant distributor.
The refrigerant distributor evenly distributes the
refrigerant to each circuit of the evaporator coil to
provide optimum performance.
3. Evaporator Coil
The coil is located in the supply airstream. In the
DX system, the liquid refrigerant is expanded in the
TXV and it then flows through the evaporator coil.
The refrigerant enters the coil as a low temperature
liquid/gas where it eventually boils into a low
temperature, low pressure gas prior to going
into the compressor. As the refrigerant passes
through the evaporator coil, it absorbs heat from
the airstream. To ensure proper operation, the coil
surface must be cleaned so that air movement over
the coil provides the necessary heat transfer.
4. Low Limit Pressure Switch
The unit includes a low limit pressure switch
(located in the compressor compartment). The
switch is installed in the suction line and shuts off
the DX system when the suction pressure drops to
50 psi for R-410A. The switch has a built in auto-
Evaporator Coil
Condenser Coil
1
2
3
4
11
5
10
13
9
8
12
7
6
Service Valve for Subcooling Gauge/
High Side Pressure Drop
Circuit A
Service Valve for
Superheat and Low
Side Pressure
Pressure Port for
Troubleshooting
Reheat Valves
High Side
Pressure Drop
reset, which will close the circuit and allow the
system to run when the pressure increases back to
90 psi for R-410A.
5. Compressors
Each unit will have either one or two high-efficiency
scroll-type compressors. The scroll in each
compressor compresses the refrigerant in a
gaseous state to a high temperature, high pressure
gas.
Compressor Protective Devices:
Thermal Overload: Each compressor is
equipped with an auto reset thermal overload.
High Temp Protection: Internal devices within
the compressor protect it against excessively
high discharge gas temperatures.
Crankcase Heater: Liquid refrigerant is
incompressible. Therefore, a crankcase heater is
installed around each compressor to boil off any
liquid refrigerant that may be absorbed into the
oil during idle periods. System power energizes
the heater; the heater should be allowed to run
24 hours prior to compressor start-up. See Start-
Up Checklist, page 9.
6. Condensing Coil
Each unit contains a condensing coil mounted
on the exterior of the unit. High temperature, high
pressure gas from the compressor enters the coil
and is eventually cooled into a high temperature,
high pressure liquid. The condensing fans move
air over the coil which pulls the heat out of the
refrigerant. To ensure proper operation, the coil
must be cleaned so that air movement over the coil
provides the necessary heat transfer.
®

6Packaged DX Module for Make-Up Air Unit
Factory Installed Components
(continued)
7. Condenser Fans
The unit is equipped with one, two or three
direct-drive condensing fans. The fans provide
the necessary airflow to cool the refrigerant in
the condensing coil. The motors are equipped
with sling protection to guard against water
penetration, and are thermally protected. The
thermal overloads shut down the condensing
fans and will automatically reset.
8. High Limit Pressure Switch
To safely shut down the DX
system in case of an increase
in refrigerant pressure,
a high limit pressure
switch is included. The switch is located in
the compressor compartment. It trips when
refrigerant pressure increases to 575 psi for
R-410A in the discharge line and can only be
manually reset when the pressure drops below
420 psi. Typically, if the high pressure limit switch
trips, a failure in the system has occurred and
more investigation is needed to determine the
underlying problem.
9. Liquid Line Filter-Drier
The liquid line filter-drier prevents moisture and
foreign matter from entering the expansion valve.
10. Moisture Indicating Sight Glass
Moisture in a DX system can freeze in the
system or dilute the compressor oil. A moisture
indicating sight glass is
provided for each refrigerant
circuit. During normal
operating conditions, the sight
glass should typically be liquid. Some gas is
acceptable, but excessive bubbles may indicate
improper charge or a leak in the system. A
green dot means that moisture is below a safe
operation level in the refrigerant, while a yellow
dot indicates moisture has been introduced into
the system and needs to be dealt with.
11-13. Access Ports
For easy measurement and charging access,
several ports are provided through the
system. These can be used to measure
system pressure and also charge or evacuate
the system. Most ports are located in the
compressor compartment for easy access.
®

7
Packaged DX Module for Make-Up Air Unit
Compressor Compartment
Components
Each Packaged DX module has a complete set of
compressor contactors, condenser fan contactors,
relays and certain integral safety controls located in
the module.
1. Power Distribution Block - field-supplied power
from main disconnect switch is terminated here.
2. Phase Monitor has jumpers going to power
distribution block)
3. Transformer provides 24 VAC to various low
voltage devices including the Phase Monitor
and to Low Voltage Terminal Strip in compressor
compartment.
4. Relays RC1 and RC2 are wired to the control
center in the compressor compartment.
5. Low Voltage Terminal Strip - Switch S4
terminates here.
6. Thermostat TS5 monitors outdoor air temperature
and turns the DX unit on or off.
7. Inlet Air Sensor monitors the incoming air
temperature and will disable the DX unit if ambient
temperatures are too low.
Additional Control Components
In addition to the control components located in the
PDX module, various high- and low-voltage circuits
are found in the Make-Up Air Unit control center. See
the unit-specific wiring diagram (found in the unit
control center) for complete information.
Phase Monitor constantly checks for
loss of a phase, phase unbalance or
phase reversal. It requires 24 VAC to
operate. When a fault is detected, it
cuts off the power supply to the low
voltage terminal strip, disabling all
motors. It has two LED indicator lights,
showing “on” and “fault”.
Switch S4 (not shown) is terminated
on Low Voltage Terminal Strip 5 above.
S4 is field-supplied and field-installed
unless ordered from the factory. See the
unit specific wiring diagram.
Thermostat TS5 monitors outdoor air
temperature. It is field-adjustable. If
there is more than one cooling circuit,
an additional controller for the second
stage will be provided.
Typical PDX Compressor Compartment
Typical Unit Control Center
Electrical Components
1. High Voltage Terminal Strip
2. Compressor Relays
3. Condenser Fan Contactor
4A. Compressor Contactor (Circuit A)
4B. Compressor Contactor (Circuit B)
5. Low Voltage Terminal Strip
6. High Limit Safety Control – Direct Gas-Fired
units only
Refrigeration Components
7A. Compressor (Circuit A)
7B. Compressor (Circuit B)
8A. High Pressure Sensor (Circuit A, Manual Reset)
8B. High Pressure Sensor (Circuit B, Manual Reset)
9A. Thermostatic Expansion Valve (TXV) (Circuit A)
9B. Thermostatic Expansion Valve (TXV) (Circuit B)
10A. Refrigerant Distributor (Circuit A)
10B. Refrigerant Distributor (Circuit B)
11. Condensate Drain (P trap here)
®

8Packaged DX Module for Make-Up Air Unit
CAUTION
UNIT SHALL BE GROUNDED IN ACCORDANCE WITH N.E.C.
POWER MUST BE OFF WHILE SERVICING.
NOTES
USE COPPER CONDUTORS ONLY
60° C FOR TERMINALS RATED LESS THAN 100 AMPS.
75° C FOR TERMINALS RATED 100 AMPS OR MORE.
FIELD CONTROL WIRING RESISTANCE SHOULD
NOT EXCEED 0.75 OHM.
FIELD WIRED
FACTORY SUPPLIED AND WIRED
LEGEND
WIRE COLOR CODE
GD11N601A013C10NM08
Wiring Diagram Code:
BK BLACK BL BLUE BR BROWN
GY GRAY LT BL LIGHT BLUE O ORANGE
PK PINK PR PURPLE R RED
W WHITE Y YELLOW
Wiring Template: M07
AMP AMPLIFIER
CC# COMPRESSOR CONTACTOR
CF1 CONDENSER FAN CONTACTOR
CH# CRANK CASE HEATER
D1 INLET DAMPER
DB1 DISTRIBUTION BLOCK
DS1 MAIN DISCONNECT SWITCH
FSC FIRE SYSTEM CONTACT
FSG FLAME SAFE GUARD
FU# FUSE
HLC# HIGH LIMIT CONTROL
HPS# HIGH PRESSURE SWITCH
LPS# LOW PRESSURE SWITCH
MOD MODULATING VALVE
M# MOTOR
OL# MOTOR OVERLOAD
PM PHASE MONITOR
PS2 AIR PROVING SWITCH
R10 COMP#1 INTERLOCK RELAY
R11 COMP#2 INTERLOCK RELAY
RC# COOLING STAGE RELAYS
RF FAN RELAY
RH HEAT RELAY
S2 SUPPLY FAN SWITCH
S4 HEAT AND COOL SWITCH
ST# MOTOR STARTER
TR# TRANSFORMER
TS1 OUTDOOR AIR SENSOR
TS2 DISCHARGE AIR SENSOR
TS4 INLET AIR SENSOR
TS5 OUTDOOR AIR SENSOR
TS9 LOW DISCHARGE TEMP SENSOR
V2 MAIN VALVE
X
TR1
75 VA
DS1
L1
SUPPLY FAN
M1
MAIN POWER
TO UNIT - 460V
R X
UNIT CONTROL
G
4
3
5
®
R10
A1A2
BL BL W
56
HPS1
55
LPS1
54
RC1
1411
PDX CONTROL
CC1
A2 A1
W
11
R10
14
COMPONENTS LOCATED IN COMPRESSOR COMPARTMENT
COMPONENTS LOCATED IN COOLING COIL MODULE CONTROL CENTER
O O O
R11
A1A2
WBL
58
HPS2
57
LPS2
CC2
A2 A1
W
11
R11
14
13
CC2
14
RC2
1411
R R
BR BR BR
CF1
A2 A1
W
13
CC1
14
R R
R X
HLC1 FSG
PS2
252423
C
27
NCNO C
PS2
SENSOR
TH
GND
S1
RH
11
22
V1 37
HV
SPARK
V2
V2
21
14 26
DG FURNACE CONTROL
R
BL
TR2
BL Y
Y
RO
BK W
24 VAC
40 VA
BK
R
R
TR5
24 VAC
50 VA
3839
BK BK
112 111
BL
Y
1
7AMP
2 3
TS2
12
4 5
MOD
6
8
DISCHARGE STAT.
BL BLBK W
10 SEC
INT
HLC1 LOCATED
IN COOLING MODULE
CONTROL CENTER
BK
BK
111
112
L2
L3
OL
ST1
T1
T3
T2L2
L3
L1
BK
BK
BK
DB1
L1
L2
L3
CC1
COMPRESSOR #1
M6
CONDENSER FAN #1
M8
L1
L2
L3
CF1
CONDENSER FAN #2
M9
CH1CH2
L1
L2
L3
COMPRESSOR #2
M7
142
141
T1
T2
T3
T1
T2
T3
T1
T2
T3
CC2
L3
L2
L1
C
PM
X
R
24 VAC
Y
PM
Y-OUT
FSC
S2
9695
ST1OL
BK
ST1
A2 A1
R W
RF
RF
A1
A2
14
11
O
WO
Y
BK
D1
2 1
TS4(1)
R B PKPK
S4
RH
W1 A1A2
W
Y1
BL
S4
21 24
RF
RF
11 14
PK
CCC NONONO
Jumper=Cool
Diff=5 Off=10
RC2
OW
A2 A1
RC1
PR W
A2 A1
TS5
CC
CNONONO
COM W
Jumper=Cool
Diff=5
TS5
SENSOR BK
O
24VAC
Typical Wiring Diagrams
®

9
Packaged DX Module for Make-Up Air Unit
CAUTION
UNIT SHALL BE GROUNDED IN ACCORDANCE WITH N.E.C.
POWER MUST BE OFF WHILE SERVICING.
NOTES
USE COPPER CONDUTORS ONLY
60° C FOR TERMINALS RATED LESS THAN 100 AMPS.
75° C FOR TERMINALS RATED 100 AMPS OR MORE.
FIELD CONTROL WIRING RESISTANCE SHOULD
NOT EXCEED 0.75 OHM.
FIELD WIRED
FACTORY SUPPLIED AND WIRED
LEGEND
WIRE COLOR CODE
GD11N601A013C10NM08
Wiring Diagram Code:
BK BLACK BL BLUE BR BROWN
GY GRAY LT BL LIGHT BLUE O ORANGE
PK PINK PR PURPLE R RED
W WHITE Y YELLOW
Wiring Template: M07
AMP AMPLIFIER
CC# COMPRESSOR CONTACTOR
CF1 CONDENSER FAN CONTACTOR
CH# CRANK CASE HEATER
D1 INLET DAMPER
DB1 DISTRIBUTION BLOCK
DS1 MAIN DISCONNECT SWITCH
FSC FIRE SYSTEM CONTACT
FSG FLAME SAFE GUARD
FU# FUSE
HLC# HIGH LIMIT CONTROL
HPS# HIGH PRESSURE SWITCH
LPS# LOW PRESSURE SWITCH
MOD MODULATING VALVE
M# MOTOR
OL# MOTOR OVERLOAD
PM PHASE MONITOR
PS2 AIR PROVING SWITCH
R10 COMP#1 INTERLOCK RELAY
R11 COMP#2 INTERLOCK RELAY
RC# COOLING STAGE RELAYS
RF FAN RELAY
RH HEAT RELAY
S2 SUPPLY FAN SWITCH
S4 HEAT AND COOL SWITCH
ST# MOTOR STARTER
TR# TRANSFORMER
TS1 OUTDOOR AIR SENSOR
TS2 DISCHARGE AIR SENSOR
TS4 INLET AIR SENSOR
TS5 OUTDOOR AIR SENSOR
TS9 LOW DISCHARGE TEMP SENSOR
V2 MAIN VALVE
X
TR1
75 VA
DS1
L1
SUPPLY FAN
M1
MAIN POWER
TO UNIT - 460V
R X
UNIT CONTROL
G
4
3
5
®
R10
A1A2
BL BL W
56
HPS1
55
LPS1
54
RC1
1411
PDX CONTROL
CC1
A2 A1
W
11
R10
14
COMPONENTS LOCATED IN COMPRESSOR COMPARTMENT
COMPONENTS LOCATED IN COOLING COIL MODULE CONTROL CENTER
O O O
R11
A1A2
WBL
58
HPS2
57
LPS2
CC2
A2 A1
W
11
R11
14
13
CC2
14
RC2
1411
R R
BR BR BR
CF1
A2 A1
W
13
CC1
14
R R
R X
HLC1 FSG
PS2
252423
C
27
NCNO C
PS2
SENSOR
TH
GND
S1
RH
11
22
V1 37
HV
SPARK
V2
V2
21
14 26
DG FURNACE CONTROL
R
BL
TR2
BL Y
Y
RO
BK W
24 VAC
40 VA
BK
R
R
TR5
24 VAC
50 VA
3839
BK BK
112 111
BL
Y
1
7AMP
2 3
TS2
12
4 5
MOD
6
8
DISCHARGE STAT.
BL BLBK W
10 SEC
INT
HLC1 LOCATED
IN COOLING MODULE
CONTROL CENTER
BK
BK
111
112
L2
L3
OL
ST1
T1
T3
T2
L2
L3
L1
BK
BK
BK
DB1
L1
L2
L3
CC1
COMPRESSOR #1
M6
CONDENSER FAN #1
M8
L1
L2
L3
CF1
CONDENSER FAN #2
M9
CH1CH2
L1
L2
L3
COMPRESSOR #2
M7
142
141
T1
T2
T3
T1
T2
T3
T1
T2
T3
CC2
L3
L2
L1
C
PM
X
R
24 VAC
Y
PM
Y-OUT
FSC
S2
9695
ST1OL
BK
ST1
A2 A1
R W
RF
RF
A1
A2
14
11
O
WO
Y
BK
D1
2 1
TS4(1)
R B PKPK
S4
RH
W1 A1A2
W
Y1
BL
S4
21 24
RF
RF
11 14
PK
CCC NONONO
Jumper=Cool
Diff=5 Off=10
RC2
OW
A2 A1
RC1
PR W
A2 A1
TS5
CC
CNONONO
COM W
Jumper=Cool
Diff=5
TS5
SENSOR BK
O
24VAC
CAUTION
UNIT SHALL BE GROUNDED IN ACCORDANCE WITH N.E.C.
POWER MUST BE OFF WHILE SERVICING.
NOTES
USE COPPER CONDUTORS ONLY
60° C FOR TERMINALS RATED LESS THAN 100 AMPS.
75° C FOR TERMINALS RATED 100 AMPS OR MORE.
FIELD CONTROL WIRING RESISTANCE SHOULD
NOT EXCEED 0.75 OHM.
FIELD WIRED
FACTORY SUPPLIED AND WIRED
LEGEND
WIRE COLOR CODE
GD11N601A013C10NM08
Wiring Diagram Code:
BK BLACK BL BLUE BR BROWN
GY GRAY LT BL LIGHT BLUE O ORANGE
PK PINK PR PURPLE R RED
W WHITE Y YELLOW
Wiring Template: M07
AMP AMPLIFIER
CC# COMPRESSOR CONTACTOR
CF1 CONDENSER FAN CONTACTOR
CH# CRANK CASE HEATER
D1 INLET DAMPER
DB1 DISTRIBUTION BLOCK
DS1 MAIN DISCONNECT SWITCH
FSC FIRE SYSTEM CONTACT
FSG FLAME SAFE GUARD
FU# FUSE
HLC# HIGH LIMIT CONTROL
HPS# HIGH PRESSURE SWITCH
LPS# LOW PRESSURE SWITCH
MOD MODULATING VALVE
M# MOTOR
OL# MOTOR OVERLOAD
PM PHASE MONITOR
PS2 AIR PROVING SWITCH
R10 COMP#1 INTERLOCK RELAY
R11 COMP#2 INTERLOCK RELAY
RC# COOLING STAGE RELAYS
RF FAN RELAY
RH HEAT RELAY
S2 SUPPLY FAN SWITCH
S4 HEAT AND COOL SWITCH
ST# MOTOR STARTER
TR# TRANSFORMER
TS1 OUTDOOR AIR SENSOR
TS2 DISCHARGE AIR SENSOR
TS4 INLET AIR SENSOR
TS5 OUTDOOR AIR SENSOR
TS9 LOW DISCHARGE TEMP SENSOR
V2 MAIN VALVE
X
TR1
75 VA
DS1
L1
SUPPLY FAN
M1
MAIN POWER
TO UNIT - 460V
R X
UNIT CONTROL
G
4
3
5
®
R10
A1A2
BL BL W
56
HPS1
55
LPS1
54
RC1
1411
PDX CONTROL
CC1
A2 A1
W
11
R10
14
COMPONENTS LOCATED IN COMPRESSOR COMPARTMENT
COMPONENTS LOCATED IN COOLING COIL MODULE CONTROL CENTER
O O O
R11
A1A2
WBL
58
HPS2
57
LPS2
CC2
A2 A1
W
11
R11
14
13
CC2
14
RC2
1411
R R
BR BR BR
CF1
A2 A1
W
13
CC1
14
R R
R X
HLC1 FSG
PS2
252423
C
27
NCNO C
PS2
SENSOR
TH
GND
S1
RH
11
22
V1 37
HV
SPARK
V2
V2
21
14 26
DG FURNACE CONTROL
R
BL
TR2
BL Y
Y
RO
BK W
24 VAC
40 VA
BK
R
R
TR5
24 VAC
50 VA
3839
BK BK
112 111
BL
Y
1
7AMP
2 3
TS2
12
4 5
MOD
6
8
DISCHARGE STAT.
BL BLBK W
10 SEC
INT
HLC1 LOCATED
IN COOLING MODULE
CONTROL CENTER
BK
BK
111
112
L2
L3
OL
ST1
T1
T3
T2
L2
L3
L1
BK
BK
BK
DB1
L1
L2
L3
CC1
COMPRESSOR #1
M6
CONDENSER FAN #1
M8
L1
L2
L3
CF1
CONDENSER FAN #2
M9
CH1CH2
L1
L2
L3
COMPRESSOR #2
M7
142
141
T1
T2
T3
T1
T2
T3
T1
T2
T3
CC2
L3
L2
L1
C
PM
X
R
24 VAC
Y
PM
Y-OUT
FSC
S2
9695
ST1OL
BK
ST1
A2 A1
R W
RF
RF
A1
A2
14
11
O
WO
Y
BK
D1
2 1
TS4(1)
R B PKPK
S4
RH
W1 A1A2
W
Y1
BL
S4
21 24
RF
RF
11 14
PK
CCC NONONO
Jumper=Cool
Diff=5 Off=10
RC2
OW
A2 A1
RC1
PR W
A2 A1
TS5
CC
CNONONO
COM W
Jumper=Cool
Diff=5
TS5
SENSOR BK
O
24VAC
®

10 Packaged DX Module for Make-Up Air Unit
Sequence of Operation
The compressors are energized by an outdoor air
thermostat TS5, located in the unit control center. The
thermostat sensor is located in the intake airstream
upstream of the DX coil. The thermostat can be a
single or dual stage thermostat depending on the
number of compressors. The first stage of cooling
will energize when the outdoor air temperature rises
above the thermostat set point plus the differential.
The thermostat is factory set at 80°F with a differential
of 5°F but can be field adjusted. The second
stage of cooling will energize when the outdoor air
temperature rises above the second stage offset plus
the differential. The second stage offset is factory set
at 10°F and the second stage differential is set at 5°F.
See the chart below for a graphical representation of
the control operation.
To summarize the
cooling controls,
the first stage of
cooling will turn
on at 85°F and the
second stage of
cooling will turn
on at 95°F. The
second stage of
cooling will turn
off at 90°F and
the first stage of
cooling will turn
off at 80°F.
Control Sequence
1. Heating/Cooling switch (S4) is closed between
terminal R and Y1.
2. N.O. contact on fan relay (RF) is energized and
closed.
3. When the outdoor air temperature is above the
set point plus the differential power passes
through N.O. contacts on outdoor air thermostat
(TS5) and energizes the cooling relay (RC1).
4. When the pressure switches LPS (refrigerant
low pressure switch) and HPS (refrigerant
high pressure switch) are in their normal state
relay R10 will energize. Starting the first stage
compressor contactor.
5. When the outdoor air temperature is above the
second stage offset plus the differential power
passes through N.O. contacts on outdoor air
thermostat (TS5) and energizes the cooling relay
(RC2).
6. When the pressure switches LPS and HPS
(refrigerant high pressure switch) are in their
normal state relay R11 will energize, starting the
second stage compressor contactor.
Model DGX Make-Up Air Unit
Outdoor
Air Intake
Model DGX Make-Up Air Unit
Unit Control Center
Condenser Fans
and Condenser Coil
Evaporator Coil
Direct Gas-Fired Burner
Model IGX Make-Up Air Unit
Outdoor
Air Intake
Model IGX Make-Up Air Unit
Unit Control Center
Condenser Fans
and Condenser Coil
Evaporator Coil
Indirect Gas-Fired
Furnace
Model MSX Make-Up Air Unit
with Electric Heat
Outdoor
Air Intake
Model MSX with Electric Heat
Unit Control
Center
Condenser Fans
and Condenser Coil
Evaporator Coil
Setpoint
Temperature
(factory set at 80° F)
Adjustable
Differential
Adjustable
Differential
OFF
OFF
ON
OFFSET
(factory set
at 10° F)
(+5° F)
(+10° F)
FIRST
STAGE
COOLING
SECOND
STAGE
COOLING
ON
Make-Up Air Units showing
Component Locations
Sequence of Operation
The compressors are energized by an outdoor air
thermostat TS5, located in the unit control center. The
thermostat sensor is located in the intake airstream
upstream of the DX coil. The thermostat can be a
single or dual stage thermostat depending on the
number of compressors. The first stage of cooling
will energize when the outdoor air temperature rises
above the thermostat set point plus the differential.
The thermostat is factory set at 80°F with a differential
of 5°F but can be field adjusted. The second
stage of cooling will energize when the outdoor air
temperature rises above the second stage offset plus
the differential. The second stage offset is factory set
at 10°F and the second stage differential is set at 5°F.
See the chart below for a graphical representation of
the control operation.
To summarize the
cooling controls,
the first stage of
cooling will turn
on at 85°F and the
second stage of
cooling will turn
on at 95°F. The
second stage of
cooling will turn
off at 90°F and
the first stage of
cooling will turn
off at 80°F.
Outdoor
Air Intake
Model DGX Make-Up Air Unit
Unit Control Center
Condenser Fans
and Condenser Coil
Evaporator Coil
Direct Gas-Fired Burner
Outdoor
Air Intake
Model IGX Make-Up Air Unit
Unit Control Center
Condenser Fans
and Condenser Coil
Evaporator Coil
Indirect Gas-Fired
Furnace
Outdoor
Air Intake
Model MSX with Electric Heat
Unit Control
Center
Condenser Fans
and Condenser Coil
Evaporator Coil
Setpoint
Temperature
(factory set at 80° F)
Adjustable
Differential
Adjustable
Differential
OFF
OFF
ON
OFFSET
(factory set
at 10° F)
(+5° F)
(+10° F)
FIRST
STAGE
COOLING
SECOND
STAGE
COOLING
ON
Make-Up Air Units showing
Component Locations
®

11
Packaged DX Module for Make-Up Air Unit
Control Sequence - Variable Air Volume
(optional)
1. Heating/Cooling switch (S4) is closed between
terminal R and Y1.
2. N.O. contact on fan relay (RF) is energized and
closed.
3. When the outdoor air temperature is above the
set point plus the differential power passes
through N.O. contacts on outdoor air thermostat
(TS5) and energizes the cooling relay (RC1).
4. When the pressure switches LPS (refrigerant
low pressure switch) and HPS (refrigerant
high pressure switch) are in their normal state
relay R10 will energize. Starting the first stage
compressor contactor.
5. When the outdoor air temperature is above the
second stage offset plus the differential power
passes through N.O. contacts on outdoor air
thermostat (TS5) and energizes the cooling relay
(RC2).
6. When the pressure switches LPS and HPS
(refrigerant high pressure switch) are in their
normal state relay R11 will energize, starting the
second stage compressor contactor.
7. When the discharge air temperature drops below
the low temperature set point (TS9) factory set
at 55°F, the second stage compressor contactor
will de-energize, turning off the second stage
compressor.
8. The second stage compressor will re-energize
when the discharge air temeprature rises above
75°F.
Pre Start-Up
Pre Start-Up Checklist
(Complete prior to application of power)
Verify proper drain trap installation. Refer to
Condensate Drain in Installation Concerns section.
Fill drain with water.
Look over the piping system. Inspect for oil at
all tubing connections. Oil typically highlights a
leak in the system. If a leak is present, refer to the
maintenance section in this manual.
Inspect all coils within the unit. Fins may get
damaged in transit or during construction. Carefully
straighten fins with a fin comb.
Check condensing fans for any damage or
misalignment. Spin the blades and make sure they
are free turning without any resistance.
Each compressor has a crankcase heater which
must have power supplied to it at least 24hours
prior to start-up. If start-up is scheduled in
24hours, unlock the power disconnect and
energize the unit without applying power to
terminal Y1.
Start-Up Checklist
The unit will be in operational mode during start-up.
Use necessary precautions to avoid injury. All data
must be collected while the unit is running. In order to
measure volts and amps, the control center door must
be open and the unit energized, using an adjustable
wrench to turn the disconnect handle.
After power has been applied
for 24 hours, verify that all
crankcase heaters are heating
properly. Either check the amp
draw on each heater or touch the
compressor near the top to verify
that the heater is warming the
compressor.
WARNING
Do not touch the heater. It will cause severe burns!
See image of crackcase heater.
Crankcase Heater
(silver colored band)
SPECIAL TOOLS REQUIRED
• Voltage Meter (with wire probes)
• Amperage Meter
• Pressure Gauges (refrigerant)
• Thermometer
• Tachometer
• Incline Manometer or equivalent
®

12 Packaged DX Module for Make-Up Air Unit
Start-Up Checklist
(continued)
CIRCUIT A
Compressor:
_______ L1 amps
_______ L2 amps
_______ L3 amps
_______ Crankcase Heater
Superheat _______Deg. F.
Should be between 8º and 12ºF.
Subcooling _______Deg. F.
Should be between 12º and 18ºF.
Discharge Pressure ________ PSIG
Discharge Line Temperature _______Deg. F.
Suction Line Pressure ________ PSIG
Suction Line Temperature _______Deg. F.
Moisture Indicating Sight Glass located on copper
tube liquid line
Bubbles Visible Yes / No
If bubbles are visible in sight glass, stop the start-up
process. Refrigerant charge may not be adequare.
Consult factory.
Color of Center Dot Green / Yellow
CIRCUIT B - if present
Compressor:
_______ L1 amps
_______ L2 amps
_______ L3 amps
_______ Crankcase Heater
Superheat _______Deg. F.
Should be between 8º and 12ºF.
Subcooling _______Deg. F.
Should be between 12º and 18ºF.
Discharge Pressure ________ PSIG
Discharge Line Temperature _______Deg. F.
Suction Line Pressure ________ PSIG
Suction Line Temperature _______Deg. F.
Moisture Indicating Sight Glass located on copper
tube liquid line
Bubbles Visible Yes / No
If bubbles are visible in sight glass, stop the start-up
process. Refrigerant charge may not be adequare.
Consult factory.
Color of Center Dot Green / Yellow
Compressors
Each DX unit is equipped with either one or two
compressors. Each compressor is part of a separate
refrigeration circuit.
NOTE
Refrigeration System Start-Up Checklist must be
performed by a Qualified Refrigeration Technician.
Outdoor Air Temperature __________ Deg. F.
Wet Bulb Reading or Dew Point or Outdoor Air
Relative Humidity (indicate which) ___________ % RH
Condensing Fan 1:
_______ L1 amps
_______ L2 amps
_______ L3 amps
 Condensing Fan 2:
_______ L1 amps
_______ L2 amps
_______ L3 amps
 Condensing Fan 3:
(if present)
_______ L1 amps
_______ L2 amps
_______ L3 amps
Apply power to terminal Y1 on the terminal strip. If
necessary, adjust thermostat TS5 to call for maximum
cooling.
Electrical Start-Up Checklist
Crankcase Heaters Working Yes / No
Check line voltage at unit disconnect
_______ L1-L2 volts
_______ L2-L3 volts
_______ L1-L3 volts
Correct fan rotation direction
Condenser Fans Yes / No
Refrigeration Start-Up Checklist
All motor(s) / compressor(s) have been checked for
rotation. If blower rotation is incorrect, wiring must
be changed at the disconnect to ensure all motor(s) /
compressor(s) are corrected.
CAUTION
Operation of scroll compressor(s) in this unit is
directional and the compressors will be damaged if
run in the wrong direction.
®

13
Packaged DX Module for Make-Up Air Unit
Symptom Possible Cause Corrective Action
Compressor will not
run or does not start
Open disconnect switch or circuit breaker. Close switch and/or breaker.
Compressor contactor not closing.
Check voltage to contactor coil,
transformer, slave relay, system. Replace
parts as necessary.
Blown fuse or tripped breaker. Check for reason and repair. Replace fuse
after correcting problem.
Low line voltage.
Check line voltage. If more than 10%
from compressor marking, correcting is
necessary.
Compressor motor protector open.
Motor thermal protector automatically
resets. Allow time (2 hrs) for compressor to
cool down so protector will reset. Restart
and check for reason overheat occurred.
Compressor defective.
Check motor for open circuit, short
circuit, grounded windings or burn
out. Compressor may be seized;
check refrigerant. If necessary, replace
compressor.
High or low pressure switch open or
defective.
If manual reset (high pressure), reset
switch. (Switch opens at 600 psi and will
not reset above 420 psi for R-410A). If auto
reset (low pressure) does not reset and
everything else is okay, replace switch.
Open room thermostat or control (no
cooling required).
Check room temperature. If temperature is
proper, wait for thermostat to close.
Loose wiring. Check all wire terminals and tighten as
necessary.
Compressor starts
but cuts out on low
pressure.
Low pressure switch
activates at 50 psig
Low or loss of refrigerant charge. Check refrigerant pressures.
Airflow restricted.
Check for dirty evaporator coil, dirty filters,
dampers closed, iced evaporator coil,
improper belt, check motor amps, check
duct design.
Restriction in refrigerant line.
Check refrigerant pressure, check and
adjust thermal expansion valve. If not
functioning properly, check for pressure
drop across the filter-drier.
Always have a completed Pre Start-Up Checklist, Unit Start-Up Checklist and Optional Accessories Checklist
prior to requesting parts or service information.
NOTE: Unit is equipped with a phase loss/phase reversal control. If system does not start, check phase of
electrical supply.
The first step in troubleshooting a refrigeration circuit is to examine the DDC and Digital Scroll
compressor controller (if present) and see if there is a fault code. The next step is to check airflow
conditions. (e.g. improper ductwork, atypical wet bulb / dry bulb, etc.) After these steps have been
eliminated, proceed with troubleshooting by following this guide:
Troubleshooting – Refrigeration Circuit (optional)
TROUBLESHOOTING NOTE
Before any components are changed on the
refrigeration system, the cause of the failure must be
determined. Further problems will exist unless the
true cause or problem is identified and corrected.
IMPORTANT
Do not release refrigerant to the atmosphere! If
required service procedures include the adding or
removing of refrigerant, the service technician must
comply with all federal, state and local laws. The
procedures discussed in this manual should only be
performed by a qualified EPA Certified Technician.
®

14 Packaged DX Module for Make-Up Air Unit
Troubleshooting – Refrigeration Circuit (continued)
Symptom Possible Cause Corrective Action
Compressor starts
but cuts out on high
pressure switch.
High pressure
activates at 600 psig
Refrigerant overcharge. Check pressures, charge by subcooling.
Condenser fan motor defective. Check fan motor.
Condenser coil inlet obstructed or dirty. Check coil and inlet clearances.
Air or non-condensables in system. Check high side equalized pressures,
check thermal expansion valves.
Defective high pressure switch. Replace.
Restriction in discharge or liquid line.
Check refrigerant line pressures, check
thermal expansion valves, replace any
defective component.
Condensing fan relay not pulling in. Replace.
Reheat valve and bypass valve not
opening. Check valves or valve circuit board.
Compressor cuts out
on thermal overload
Low voltage. Check voltage.
Sustained high discharge pressure.
Check running amperage and conditions
described under “low suction pressure”
symptoms.
High suction and discharge pressures.
Check thermal expansion valve setting,
check for air in system. Check air
conditions and cfm.
Defective compressor overload.
If compressor is hot, allow compressor
to cool for two hours. Recheck for open
circuit.
Improper refrigerant charge. Check subcooling.
Improperly wired. Review wiring schematics.
Loose wiring. Check all connections.
Defective start relay. Replace relay.
Motor windings damaged. Verify amp draw.
Compressor hums,
but will not start
Improperly wired. Review wiring schematics.
Low line voltage. Check voltage.
Loose wiring. Check all connections.
Defective start relay. Replace relay.
Motor winding damaged. Verify amp draws. Replace compressor if
necessary.
Internal compressor mechanical damage. Replace.
Compressor noisy or
vibrating
Refrigerant overcharge. Check pressures and subcooling.
Liquid floodback. Check thermal expansion valve setting.
Check for refrigerant overcharge.
Tubing rattle.
Dampen tubing vibration by taping or
clamping. Carefully bend tubing away from
contact where possible.
Scroll Compressor rotating in reverse
(3-phase). Rewire for opposite rotation.
Worn or damaged compressor. Replace the compressor.
Improper mounting on unit base. Check that compressor is properly
isolated.
Always have a completed Pre Start-Up Checklist, Unit Start-Up Checklist and Optional Accessories Checklist
prior to requesting parts or service information.
®

15
Packaged DX Module for Make-Up Air Unit
Symptom Possible Cause Corrective Action
High suction
pressure
Excessive load on evaporator coil. Check for high entering wet bulb
temperature, check for excessive air.
Compressor is unloaded (Digital Scroll). Check Digital Scroll controller signal and
solenoid valve.
Expansion valve sensing bulb not secured
to suction line.
Check the thermal expansion valve, ensure
bulb is insulated.
Check superheat. If superheat is high, then
valve is choking refrigerant flow.
• Check bulb for contact.
• Adjust valve for superheat. ~10°F
• Replace valve power head or valve.
Thermostatic expansion valve pressure
limit feature incorrect or inoperative.
Overfeeding.
Check bulb location and clamping. Adjust
superheat. Replace expansion valve power
head.
Room load too large. Reduce the load or add more equipment.
Overcharged. Check pressures and subcooling.
High discharge
pressure
Thermal expansion valve setting. Check thermal expansion setting and
calibrate superheat / subcooling.
Air inlet to condenser dirty or obstructed. Check for proper clearances and possible
air recirculating.
Condenser fan motor defective. Check condenser fan motor.
Too much refrigerant. Remove excess refrigerant.
Non-condensable in system. Remove non-condensable from system.
Dirty condenser coil. Clean condenser coil.
Condenser fan not running or running
backwards.
Check electrical circuit and fuse. Check
fan cycling controls.
High load conditions. Add more equipment or reduce load.
Low suction
pressure
Refrigerant undercharge/loss of refrigerant
charge. Check pressures and subcooling.
Blower running backward. Interchange any two wires from 3 phase
disconnect.
Loose blower, pulley or belts. Check drive pulley alignment, belt tension.
Low entering air temperature (low load
conditions). Check entering air wet bulb conditions.
Refrigerant leak. Check system for leaks. Repair leaks and
add refrigerant.
Evaporator dirty or iced up or airflow
restricted.
Clean the coil. Check fan operation. Check
airflow.
Plugged liquid line filter-drier. Replace filter-drier, check psi across filter.
Improper Hot Gas Bypass setting. Check setting and correct as required.
Expansion valve defective, superheat too
high or valve too small.
Adjust valve for proper superheat or
replace the expansion valve if too small or
defective.
Moisture in system, check sight-glass. Reclaim refrigerant, check for leaks,
recharge.
Always have a completed Pre Start-Up Checklist, Unit Start-Up Checklist and Optional Accessories Checklist
prior to requesting parts or service information.
Troubleshooting – Refrigeration Circuit (continued)
®

16 Packaged DX Module for Make-Up Air Unit
Symptom Possible Cause Corrective Action
Low discharge
pressure
Insufficient refrigerant charge. Check subcooling, check for leak. Repair
leak and add refrigerant.
Defective or improperly adjusted
expansion valve.
Check superheating and adjust thermal
expansion valve.
Low suction pressure. See “low suction pressure”.
Faulty condenser temperature controls.
(Condensing fan cycle switch).
Check condenser controls and reset to
obtain desired condensing temperature.
Compressor short
cycles
Thermostat location or controls
malfunction.
Check thermostat, check heat anticipator
setting.
Improper refrigerant charge. Check subcooling, verify superheat.
Defective high or low pressure control. Check high or low pressure switch.
Liquid floodback. Possible tight bearings, see above.
Defective expansion valve. Check thermal expansion valve and
superheat.
Poor air distribution. Check ductwork for recirculating.
High discharge pressure. See “high discharge pressure”.
Leaking discharge valves in compressor. See “high suction pressure”.
Low airflow at evaporator(s). Check blower operation and airstream
restrictions.
Incorrect unit selection (oversized). Contact factory.
Always have a completed Pre Start-Up Checklist, Unit Start-Up Checklist and Optional Accessories Checklist
prior to requesting parts or service information.
®

17
Packaged DX Module for Make-Up Air Unit
This unit requires minimal maintenance to operate
properly. To ensure proper operation and longevity,
the following maintenance schedule should be
followed. The items in this list assume a relatively
clean air environment, and may require attention more
frequently in a dusty or dirty area. If this unit contains
an indirect gas-fired heater, refer to the Installation,
Operation and Maintenance manual provided with
the unit for maintenance purposes. An EPA Certified
Technician should complete all refrigeration systems
checks.
Maintenance Frequency:
Monthly
1. Condensate Drain
Inspect and clean. Refill with water or glycol.
Annually
It is recommended that the annual inspection and
maintenance occur at the start of the cooling season.
After completing the checklist, follow the unit start-up
checklist provided in the manual to ensure the
refrigeration system operates in the intended manner.
1. Door Seal
Check if intact and pliable.
2. Wiring Connections
Check all connections for tightness.
3. Cabinet
Check entire cabinet, inside and out, for dirt
build-up or corrosion. Remove accumulated
dirt, remove any surface corrosion and coat
the area with appropriate finish.
4. Evaporator Coil Maintenance
Check for cleanliness. Clean if required.
5. Condenser Coil Maintenance
Check for cleanliness. Clean if required.
6. Condensate Drain
Inspect and clean. Refill with water.
7. Condensing Fan Blades and Motors
Check for cleanliness.
Check all fasteners for tightness.
Check for fatigue, corrosion and wear.
DANGER
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to the unit
to OFF at disconnect switch(es). Unit may have
multiple power supplies.
CAUTION
Use caution when removing access panels or other
unit components, especially while standing on a
ladder or other potentially unsteady base. Access
panels and unit components can be heavy and
serious injury may occur.
Routine Maintenance Maintenance Procedures:
Lubrication
Check all moving components for proper lubrication.
Apply lubricant where required. Any components
showing excessive wear should be replaced to
maintain the integrity of the unit and ensure proper
operation.
Dampers
Check damper (if present) to ensure it opens and
closes properly and without binding. Apply power to
motorized dampers to ensure the actuator opens and
closes the damper as designed.
®

18 Packaged DX Module for Make-Up Air Unit
Maintenance Log
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®

19
Packaged DX Module for Make-Up Air Unit
Maintenance Log
Date __________________ Time _____________ AM/PM
Notes:___________________________________________
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®

20 474681 • Packaged DX for Make-Up Air Units, Rev. 1, September 2011 Copyright 2011 © Greenheck Fan Corporation
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the
shipment date. Any units or parts which prove to be defective during the warranty period will be replaced at our option
when returned to our factory, transportation prepaid. Motors are warranted by the motor manufacturer for a period of one
year. Should motors furnished by Greenheck prove defective during this period, they should be returned to the nearest
authorized motor service station. Greenheck will not be responsible for any removal or installation costs.
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.
®
Phone: [phone] • Fax: [phone] • E-mail: [email protected] • Website: www.greenheck.com
Warranty
AMCA Publication 410-96, Safety Practices for Users and Installers of Industrial and Commercial Fans, provides additional
safety information. This publication can be obtained from AMCA International, Inc. at www.amca.org.