Quest Engineering IQ Evolution Series User manual

Evolution
OPERATION AND MAINTENANCE MANUAL
QuestClimate.com
IQ SERIES
GROW ROOM HVAC

Table of Content
General Information ..............................................................................................................2
Document Scope........................................................................................................................................2
Contact Us..................................................................................................................................................2
Operating Safety (Warnings, Cautions, and Notes)...................................................................................2
Basic Information.......................................................................................................................................4
Air Conditioning Option –Dry Coolers (OAFC). .........................................................................................6
Equipment Specific Data............................................................................................................................8
Layout and Components ........................................................................................................9
Dehumidifier Main Components ...............................................................................................................9
Control System.........................................................................................................................................10
Dry Coolers Layout and Components. .....................................................................................................12
Sequence of Operation ........................................................................................................14
Set Points .................................................................................................................................................14
Ventilation ...............................................................................................................................................14
Space Heating ..........................................................................................................................................14
Air Conditioning and Dehumidification. ..................................................................................................14
Economiser Option (Eco-Coil)..................................................................................................................16
Basic Maintenance ..............................................................................................................17
Maintenance and Safety..........................................................................................................................17
Maintenance Key Points..........................................................................................................................17
Routine Maintenance Program ...............................................................................................................18
Specific Components Maintenance.........................................................................................................19
Equipment Warranty ...........................................................................................................21

Quest IQ Evolution OMM 2September 2020
General Information
Document Scope
This manual provides operation and maintenance information about the Quest IQ Evolution Series HVAC system
and its operation.
Additional information regarding installation, maintenance, and equipment commissioning and auxiliary devices
(dry cooler, communication interfaces, etc.) is provided with the HVAC system and can also be obtained from the
manufacturer.
Contact Us
Quest
QuestClimate.com
For immediate assistance:
Phone: [phone] (Canada), 1-877-420-1330 (USA)
For unit commissioning, miscellaneous inquirieis, parts requests and warranty:
Email: [e-mail]
Operating Safety (Warnings, Cautions, and Notes)
FOR YOUR SAFETY: READ BEFORE PERFORMING ANY OPERATIONS, MAINTENANCE OR SERVICE TASKS!
Only qualified technicians should install, operate, maintain or service mechanical equipment such
as this HVAC system.
Read this manual before performing any tasks to familiarize yourself with the equipment as well
as with any potential hazards. Always exercise caution!
Beware of electrical power and high electrical voltage!
•Follow proper safety procedures –lockout, tagout, and other respective procedures
•Failure to follow safety procedures can result in serious injury or death
Beware of moving parts and hot surfaces!
•Make sure to stop all moving parts (fans, blowers, etc.) before accessing the equipment’s
internal compartments
•Be aware of hot surfaces (hot refrigeration, space heating pipes, coils, heaters, etc.)
Beware of high pressures and chemicals!
•HVAC systems, equipped with compressors, contain refrigerant under high pressure; oil is
also contained in the compressor and refrigeration circuit(s)
•Some HVAC systems may also contain other liquids such as glycol mixtures

September 2020 3Quest IQ Evolution OMM
The following warnings, cautions, and notes appear throughout this manual and referenced documentation
whenever special care must be taken to avoid potential hazards that could result in equipment malfunction or
damage, personal injury, or death.
WARNING
Indicates a potentially hazardous
situation which could result in
serious injury or death if handled
improperly.
CAUTION
Indicates a potentially hazardous
situation which could result in
moderate injury or equipment
damage if handled improperly.
Note
Indicates a situation that could
result in equipment damage or
improper/ineffective operation if
handled improperly.
Attention: Installation and Service Contractors
WARNING! Any work (installation, start up, service, maintenance, repair, etc.) on any mechanical
equipment (HVAC system, dry cooler, etc.) must be performed in accordance with manufacturer’s
recommendations as well as submittal documentation, local Codes and Regulations, and appropriate field
practices. Failure to do so could result in personal injury, equipment damage or malfunction, and will void
equipment warranty. Only qualified and properly trained individuals should perform tasks on this equipment.
Attention: Maintenance Team
CAUTION. To ensure equipment longevity and proper and efficient operation, the HVAC system and its
auxiliary systems and devices (e.g. dry cooler) should be maintained properly and regularly. Failure to do so could
negatively affect premise comfort levels and people’s health. It could also lead to equipment damage,
malfunction, premature tear and ware and may void equipment warranty.

Quest IQ Evolution OMM 4September 2020
Basic Information
HVAC system View and Options
Standard Quest IQ Evolution Series HVAC system general view and options * are shown on Pic.C.1.
* All available options (tonnage, ductwork connections, AC options etc.) are shown. Refer to
the submittal and other relevant documentation for your equipment specific options, dimensions etc.
Pic. C.1
Air/Ductwork Connections
•Return Air (RA) ductwork options -
horizontal.
•Supply Air (SA) ductwork options –top,
bottom, horizontal*.
•Outdoor Air (OA, not shown) –top, side
Piping Connections*
③
AC –Water-Cooled (water/glycol)
⑤
Condensate Drain
⑥
Electrical/control
** Economiser Coil optional
**

September 2020 5Quest IQ Evolution OMM
Options:
•Indoor models (see Dehumidifier Optional Arrangement below for more details):
oTwo-compressor option, 4 to 32 ton cooling capacity (appx.) - models AG204 to AG232;
o4-compressor design pending, 20 to 32 tons –models AG220, AG224, AG228, AG232 - future
•Airflow and ductwork connection options (Return and Supply Air) - see Pic. C.1.
oNormally Outdoor Air, if/when required, is introduced via different/separate equipment; however,
such option (OA intake) is also available with the dehumidifier –consult manufacturer, as needed.
•Optional Space Heating - hot water coil, electric or gas heater. For specific details on space heating (hot water,
gas, electric) option, refer to the submittal and other documentation:
oGas-fired duct heater , available as an attached module to the supply air opening.
oElectric heater is externally mounted on the SA opening.
oHot water coil, internally mounted.
oRefer to your dehumidifier’s submittal documentation.
•Air Conditioning (AC) –external water cooling via dry cooler.
•Optional Economiser Coil (only available with water-cooled AC option).
HVAC System External Systems Connection
Pic. C.1 shows provisions for external systems connections, including ductwork, electric power and control wires
and various piping connections.
•Except for the condensate, all other piping systems are feature-dependent and may not be present.
•Air Conditioning (AC) Connection. Normally, only one AC option –water-cooled –is present with each
dehumidifier.
o“Water In/Water Out” on Pic.C.1 indicate water-cooled piping connection for dehumidifier equipped
with Economizer Coil option.
•Gas line. If the dehumidifier is equipped with a gas heater for space heating purposes, the gas line connection
is to be brought to the gas heater directly.
NOTE. Dehumidifier MUST be equipped with a P-trap at the condensate connection for proper operation! If
dehumidifier is requested/provided from the factory without P-trap, one MUST be installed on site prior to
dehumidifier being commissioned. Refer to the dehumidifier stickers and Installation Manual for details.
CAUTION! Current manual shows general/default connections’ location. For details regarding specific
equipment connections (actual location, piping sizes and position dimensions, circuit type and flow direction
etc.), refer to the equipment submittal documentation as well as its labels and stickers.
Attention! Equipment Clearances and Dimensions!
CAUTION! For equipment proper operation, maintenance and service, respective clearances should be
maintained. Generally, 30” clearances to the equipment must be kept for the maintenance and service purposes.
For the specific required clearances information, as well as dehumidifier overall dimensions, distances to pipe
connections, duct connections etc., refer to the submittal documentation.
WARNING! Gas Line. The gas line must be installed in accordance with respective device documentation
(boiler, furnace, etc.) and local codes and regulations.

Quest IQ Evolution OMM 6September 2020
Dehumidifier Optional Arrangement.
Two-Compressor Arrangement
Standard Quest IQ Evolution Series HVAC system normally has two compressors.
•Two-Compressor (or “Double-Decker”) dehumidifier (shown on Pic. C.2). It is composed of two identical
single-compressor dehumidifiers, one installed on top of
another and controlled as a single dehumidifier (each deck
is equipped with one compressor/refrigeration circuit).
Two-Compressor Arrangement –Dehumidifier Model
Dehumidifier typical arrangement, total capacity, and number of
compressors are reflected in its model (for specific dehumidifier
model refer to its Main Label –see Specific Data Info below), as
illustrated in example below:
•AG204 - double-deck two-compressor dehumidifier (composed
of two identical dehumidifiers AG002).
Most often, “Double-Decker” dehumidifier comes as two horizontal
“decks”, one “stacked” on the top of another; however it could also
be composed of two “decks”, installed side by side or separately,
still being controlled as one dehumidifier.
Air Conditioning Option –Dry Coolers (OAFC).
Basic views of standard air conditioning option is shown below on Pic. C.3 (coolers, NG models); standard
combinations of the dehumidifier and respective air conditioning option (based on their capacities) are shown in
Table C.1.
* Table C.1 shows standard dehumidifier and cooler
combination; depending on number of factors, dehumidifier
may have different cooler provided with it - refer to the
dehumidifier’s submittal documentation for more details.
** The pump package is optional - the dry cooler may
be provided without it.
In some cases, multiple dehumidifiers could be served by one common larger dry cooler.
Such common fluid cooler would normally be sized based on accumulative capacity of the dehumidifiers and,
respectively, could be comprised of multiple NG-V-12 fluid coolers, all operating as one.
Table C.1. Dehumidifier-AC Combination*
Dehumidifier –Fluid Cooler
Fig.#
AG204
NG-Z-1
4
AG206 –AG208
NG-V-0
5
AG208 –AG212
NG-V-11
6
AG214 - AG232
NG-V-12
7
AG228 –AG232
NG-V-22
8
Pic. C.2
Attention! Equipment Clearances!
Proper clearances should be maintained for adequate airflow and heat rejection! Generally, up to 36” side and
96” top clearances are required. For more information on clearances as well as equipment dimensions and other
details, refer to the submittal documentation.

September 2020 7Quest IQ Evolution OMM
Pic. C.3

Quest IQ Evolution OMM 8September 2020
Equipment Specific Data
Specific information for individual HVAC systems is provided in the following methods:
Nameplate (Pic. C.5):the manufacturer tag
attached to the front of the system includes
the system’s most critical data:
General data including:
oSerial number
oHVAC system model
(nomenclature)
oDesign room conditions (air
temperature and humidity)
Operational data, including:
oRefrigeration (refrigerant type,
charge, etc.)
oElectrical/airflow (HVAC system
voltage, CFM, etc.)
oOther applicable data
(space/auxiliary heating features,
etc.)
Labels and Stickers: attached when applicable
to the exterior and interior of the HVAC
system to show:
External systems connections
location/direction
(space heating, cooling circuits,
condensate)
Air filter locations, quantity, and size.
Additional Info (warning, caution stickers, etc.)
Wiring Diagrams: attached to the interior side of the
HVAC system, depict HVAC system control and power
wiring.
Remotely installed cooler would have its specific information provided in similar manner (labels etc.).
Attention! Glycol Circuits.
Unless otherwise indicated, equipment fluid circuits (except for refrigeration fluid circuit) such as compressor
glycol loop, dry cooler etc., are filled/to be filled with water/glycol mixture; normally, rust inhibitor-infused food-
grade propylene glycol is used.
Glycol mixture concentration is normally shown on Main Label –refer as needed.
Note: The main label shown above is just an example.
Pic. C.5

September 2020 9Quest IQ Evolution OMM
Layout and Components
The general layout and components’ location is the same for all dehumidifiers of current type, however some may
vary, based on the dehumidifier’s specific options –refer to submittal documentation. Pic. D.1-A below shows
most available options, some of which may not be present on your dehumidifier:
•Pic. D.1-A shows a single-compressor dehumidifier layout.
•Economizer coil option is shown separately on Pic. D.1-B.
Dehumidifier Main Components
•Main Blower (1) is in the main blower compartment next to the Main Electric Panel (2) and Compressor
Compartment (3).
2
1
3
4
7
8
9
11
10
13
14
N/A
18
17
16
Pic. D.1-A

Quest IQ Evolution OMM 10 September 2020
•Outdoor Air (OA) Intake option (opening, damper and filter (4)) is available, although very rarely used.
•Refrigeration coils - Evaporator (7) and Reheat (internal condenser) (8) - are located directly downstream of
the Main Filter Rack (9).
oEvaporator Bypass Damper (10) is located next to the evaporator coil. It helps to control compressor
suction pressure by adjusting the amount of air, bypassing the evaporator.
•Space heater (11) location, if the dehumidifier is equipped with one, may vary:
oHot water coil is usually located directly downstream of the reheat coil;
oElectric heater is externally mounted directly on the dehumidifier’s supply air duct connection.
oGas heater (duct heater or boiler package) normally is installed externally.
•Compressor (13), Receiver (14) and other components are located within the Compressor Compartment (3).
oSome larger compressors may have VFD (variable frequency drive), located in Main Electric Panel.
oDehumidifier with water-cooled air conditioning option (equipped with dry cooler or connected to
external water-cooling source) would have plate heat exchanger (16) as a part of compressor circuit.
•Main Electric Panel contains Main Control Board (17), Operator Panel (18) and other electrical components.
Economiser Option.
Pic. D.1-B shows
dehumidifier, equipped
with Economizer Coil
option:
•Additional
Economizer
Section (91) is
located between
Evaporator coil
and Main Filter
Rack. Section
includes
Economizer Coil
(92) and three-
way Mixing
Valve (93):
oEconomizer coil and mixing valve are piped with plate heat exchanger and external AC water-
cooled equipment (dry cooler etc.)
Control System
The dehumidifier control system is composed of sensors, spread throughout the dehumidifier, Main Control
Board, Operator Panel and other electric components, located in the Main Electric Panel.
91
92
93
Pic. D.1-B

September 2020 11 Quest IQ Evolution OMM
Temperature Sensors (Pic. D.2):
a) Temperature sensors (thermistors) are used to monitor
various temperatures (air, water, compressor, etc.);
b) Combo sensor is used to monitor air temperature and
humidity.
Compressor operation is monitored with pressure sensors (Pic. D.3):
c) Pressure Transducers (as main operational control and safety) and
d) Pressure Switches (fast-reacting backup safety).
Depending on the dehumidifier option, it could be equipped with some other sensors and safeties as well. Sensors
and safeties approximate location is shown on Pic. D.4 .
•RA Combo Sensor (21) measures temperature and humidity of the grow room air (Return Air), entering the
dehumidifier. It is located at the main filter rack.
•If dehumidifier is equipped with OA opening option, OA Temperature Sensor (22) would be also present to
measure outdoor air temperature; it’s located at the OA filter rack.
b
a
c
d
Pic.D.3
Pic. D.2
Pic. D.4
21
23
24
22
N/A
27
N/A
28

Quest IQ Evolution OMM 12 September 2020
oAs an option, the combo sensor (instead of regular thermistor) can be installed at the OA intake to
measure both the temperature and humidity of the outdoor air.
•ET (EvapT) Temperature Sensor (23) measures the temperature of air leaving evaporator coil. It’s located
directly downstream of the evaporator.
•SA temperature sensor (24) measures the temperature of the air leaving the dehumidifier (supplied to the
premise). It must be located downstream of the space heater:
oIn some cases, where the space heater is external to dehumidifier, the sensor will be provided with
the dehumidifier to be field-mounted into the supply air ductwork downstream of the space heater.
•The compressor’s discharge line (high pressure side) is equipped with Temperature and Pressure sensors set -
Discharge Temperature Sensor, High Pressure Transducer and High Pressure Switch (27) - to protect the
compressor and control its operation. A similar function is performed by Suction Temperature, Low Pressure
Transducer and Switch (28) located at compressor’s suction line (low pressure side).
•Main Electric Panel, apart from devices listed above (control board, OP, etc.) also contains Voltage Monitor;
some optional control sensors and devices such as an air pressure differential sensor, current sensor(s). It may
also be located in main electrical panel or in the dehumidifier in general.
Dry Coolers Layout and Components.
The general layout of AC options (water-cooled) is shown on Pic.D.5-A below with the dry cooler NG-V-0 as an
example. While layout and main components are similar for all applicable AC options, there are some deviations
(number of fans, coil sizes, composition, etc.). Refer to AC Options (Basic Information chapter) for additional
information.
•Cooling (AC) coil (31) (where heat from refrigerant
in the outdoor condenser or glycol mixture in dry
cooler is rejected to the ambient air) is mounted
onto metal frame/air box upstream (before) the fan
(32), that pulls the air through the coil to absorb the
heat.
oCondenser/cooler piping connections (33)
are identified respectively (IN –OUT, Hot
gas –Liquid etc.);
In some cases, dry cooler piping
connection(s) may be located
within pump package box (37), if
dry cooler is provided with one.
Piping connection location may
vary –refer to particular
cooler/condenser labels, stickers,
submittal and other
documentation.
oDepending on the type, size and
installation, outdoor condensers may be provided with different set of legs/supports (34), which are
required assembly on-site –refer to the Installation manual.
oDepending on the size and capacity, condenser or cooler may have multiple fans or coils.
•Electric power is normally to be brought to disconnect (35) (if cooler/condenser is equipped with such), which
feeds it to the electrical box (36), that contains condenser or cooler power and control apparatuses.
oDepending on type of dry cooler, location of electrical box may slightly differ.
32
36
35
33
37
31
NG-V-0
Pic. D.5-A

September 2020 13 Quest IQ Evolution OMM
Dry Cooler Serving Multiple Dehumidifiers.
In some cases, group of
dehumidifiers could be served by
one single large dry cooler. Such
dry cooler would normally be
comprised of multiple NG-V-12
blocks (shown on Pic. D.5-B,
Fig.1), all connected together and
operated as one single dry cooler.
The more capacity is required by
the dehumidifiers, the more (up
to six) blocks could be combined.
Pic. D.5-B Fig.2 shows single dry
cooler NG-V-32, comprised of
three such blocks. Each block could be equipped with its own pump package.
Dry Cooler Pump Package
Dry Coolers, if equipped with such option, would have a pump package box. Pic.D.6 below shows general layout of
pump packages, used for NG-Z (left) and NG-V (right) dry coolers. Note that the package used with NG-V coolers
could be mounted onto the dry cooler directly (standard) or provided separately.
•Pump (38) establishes glycol mixture circulation through the dry cooler and dehumidifier.
•Expansion tank (39) compensates for temperature-based glycol volume fluctuation;
•The pump package electrical sub-panel (40) contains the pump package electrical power and control
apparatuses.
oDue to the compact design of the dry cooler NG-Z, the electrical sub-panel includes power and
control apparatuses for the dry cooler and the pump package itself.
•The pump package manifolds are usually equipped with pressure gauges, automatic air venting valve, draining
and other valves.
40
38
39
38
40
39
Pic. D.6
NG-Z
NG-V
Pic. D.5-A

Quest IQ Evolution OMM 14 September 2020
Sequence of Operation
The HVAC system’s ventilation system establishes the required airflow through the HVAC system. The control
system compares air temperature and humidity to their desired values (set points) and proceeds to dehumidify,
cool or heat the recirculating air.
Set Points
The control system is constantly adjusting HVAC system operation to achieve and maintain said parameters within
couple degrees/percent of the set point.
•Grow room temperature and humidity set point may vary based on the pre-set schedule (“lights on”,
“lights off” etc.).
Note: Refer to the HVAC system’s main label for the design value of control parameters.
Ventilation
The main blower runs continuously, establishing required airflow. The main blower speed is pre-set via adjustable
variable signal.
HVAC system can control the outdoor air intake (OA1) damper and the external minimum exhaust fan (EF1) (to
bring outdoor fresh air in and to directs portion of return air outdoors, respectively).
•If such option is used, exhaust fan speed would be controlled, like the main blower, via adjustable (pre-set)
variable signals: the exhaust fan speed may vary depending on scheduled ventilation mode.
•Note. Externally installed Exhaust Fan(s) and Outdoor Air damper(s) could be also controlled by the HVAC
system control system for Exhaust/Purge purposes.
Space Heating
When premise air temperature drops below the set point, the HVAC system control system issues a call for Space
Heating Mode and engages space heater (electric heater, hot water coil with valve, etc.) by sending space heating
signal, respective to space heater control type - on/off, variable (0-10VDC), etc.
Air Conditioning and Dehumidification.
When premise air temperature goes over (exceeds) its set point, the dehumidifier control system issues a call for
Air Conditioning Mode. Respectively, when premise air humidity goes over (exceeds) its set point, the dehumidifier
control system issues a call for Dehumidification Mode. In some instances, these calls may co-exist.
To execute Dehumidification or Air Conditioning (Cooling) mode, control system, depending on current conditions,
would resort to available means of cooling or dehumidification –compressor(s), as main/default one, and
economiser (if dehumidifier is equipped with such and when conditions warrant).
Compressors
Whenever the compressor operates, the evaporator is always dehumidifying and cooling the return air. The heat
removed from the air at the evaporator, as well as the heat from the compressor's action, must be rejected to one
of three heat sinks: grow room (premise) air or outdoors. The control system will direct the heat to where it is
needed based on grow room air temperatures:
•If room air is needed to be warmed up –more heat is diverted towards reheat coil;
•Rest of the heat (if any) is diverted towards outdoors (dry cooler)

September 2020 15 Quest IQ Evolution OMM
Compressor Circuit Operation
Piping schematic for compressor circuit is shown on Pic. E.1.
When a demand requires the compressor to operate, the following sequence occurs:
-Once blower operation, related safeties and timers are confirmed by the control system, the pump down
solenoid valve opens and once pressure stabilizes, the compressor starts.
-Reheat valve diverts portion of hot gas into the reheat coil. Remainder of the hot gas goes into respective AC
heat exchanger (outdoor condenser coil –for air-cooled option, or plate heat exchanger paired up with dry
cooler or external chilled water sourse –for water-cooled option).
oDry cooler fan is engaged only if hot gas is diverted to outdoor heatsink and compressor pressure is
higher than pre-set level (see Outdoor Dry Cooler Operation below).
-Once demand for the compressor’s operation is removed (respective call is satisfied), the pump down solenoid
valve closes; once the compressor suction pressure reaches the pre-set pressure, the compressor stops.
Pic. E.1

Quest IQ Evolution OMM 16 September 2020
Outdoor Dry Cooler Operation.
Respective signal(s) are sent by control system to engage EC-type fans via a variable 0-10VDC signal (proportional
to the compressor head pressure level). Refer to the wiring diagram if/when needed.
If the dry cooler is equipped with the built-in pump package (to establish cooling fluid flow between HVAC system
and the dry cooler or to serve as additional/booster pump), the said pump is also engaged along with dry cooler
fans –pump would stay engaged while fans are engaged (regardless of the fans’ speed).
Economiser Option (Eco-Coil).
HVAC system, equipped with eco-coil and dry cooler, can take an advantage of economiser option and use outdoor
air to cool the premise without resorting to compressor operation.
Piping schematic, shown on Pic. E.1, includes Eco-coil paired up with outdoor dry cooler:
•When Air Conditioning (cooling) mode is requested and outdoor air conditions warrant (outdoor air and,
respectively, cooling media in the dry cooler are cool enough), ECV (eco-coil mixing valve) would divert
cool media from dry cooler into eco-coil, thus cooling recirculating air without running the compressor.

September 2020 17 Quest IQ Evolution OMM
Basic Maintenance
Although equipment is built for minimal service downtime, periodic preventative maintenance is required to
ensure maximum reliability, safety, and operating efficiency.
Maintenance and Safety
Only qualified/properly trained personnel should attempt to perform respective maintenance tasks.
•When it is necessary to work with live electrical components, have a licensed electrician or other qualified
professional perform the required task.
•Be properly trained and equipped. Some maintenance tasks may involve usage of power tools, chemicals, etc.
Refer to such tools and materials data (manuals, MSDS, etc.). Personnel performing such maintenance tasks
should be:
oProperly trained to handle such tools and materials safely
oEquipped with proper personal protective equipment
•Turn the power off. Before performing any maintenance, disconnect all electrical power, including remote
disconnect, and discharge all energy storing devices (VFDs, etc.) before servicing. Follow proper lockout
procedures to ensure that power cannot be accidentally restored. Failure to follow provided safety warnings
and labels could result in serious injury or death.
•Be aware of potential hazards. The equipment contains moving mechanical parts, components under high
refrigerant pressures and surfaces with high temperatures. Before entering the HVAC system and/or
performing any equipment maintenance work, make sure that all moving parts are stopped, and it is safe to
perform required task.
Maintenance Key Points
Here are some basic/key maintenance considerations, pertinent to all HVAC systems and their auxiliary systems:
•HVAC system in mechanical room. No chemicals should be stored in the same mechanical room where the
HVAC system is installed. Chemical fumes/off-gas can cause premature deterioration of the equipment.
oStore chemicals in a separate, well-ventilated room.
•Access to the Equipment. Ensure that the equipment is accessible (minimum clearances are maintained):
approaches to the HVAC system are not restricted/limited with materials in mechanical room (indoor
installed) or with snow (outdoor installed HVAC systems, OACC and OAFC).
•“MUST DO”maintenance task. Although all other maintenance tasks are as important, these two maintenance
tasks are the most common and most helpful:
oMaintain clean air filters (return, outdoor air filters, etc.). Make sure to replace dirty filters regularly.
oMaintain clean air-side coils (especially Dry Cooler). Make sure to clean coils regularly.
WARNING! To ensure equipment longevity and proper and efficient operation, the HVAC system and its
auxiliary systems and devices (e.g. dry cooler) must be maintained properly and regularly. It is recommended to
create a facility-specific Routine Maintenance Program.
Failure to maintain the equipment properly and regularly could result in personal injury, equipment damage or
malfunction and will void the equipment warranty.

Quest IQ Evolution OMM 18 September 2020
Routine Maintenance Program
Creating facility-specific routine maintenance program and following it is vital to equipment longevity and efficient
operation.
The suggested general maintenance operations and their frequency/intervals, listed in the table M-1 below, can be
used to create such a program. For more detailed maintenance recommendations related to specific components,
refer to the respective component manufacturer’s manual.
Table M.1. Recommended Maintenance Tasks and Intervals
Interval
Maintenance Task
Weekly
Observe the equipment for any changes in running conditions and unusual noise
Quarterly
Air filters: Industry recommendation is to change air filters every process cycle (at minimum)
Verify that all set-points are correctly programmed as specified by the facility operator
Semi-
Annually
Inspect and clean the drain pan(s)
Tighten electrical connections, if required
Check and tighten, if required, hose clamps and sensor mounts
Inspect all airside coils (dry cooler, HVAC system coils – evaporator, etc.) for dirt, cobweb build-up,
etc.; clean as needed
Check that the P-trap is primed (filled with water). It is good practice to pour some water into the
drain pan to ensure that the P-trap is primed and operational
Check the louvres and dampers (as applicable) for accumulation of dust and clean as required
Inspect the equipment’s cabinet for corrosion or other deterioration. If any damage is found, clean
and repaint the affected surface with a rust-resistant primer
Annually
Clean the fan wheel(s). Exercise caution not to disturb balance weights/clips, if any.
Check dampers operation (linkage/actuator is not loose, damper opens/closes properly etc.)
Inspect electrical components, wiring and insulation
Rotate the fan wheel(s) and check for obstructions and rubbing
Check gasket condition on all doors to ensure an airtight seal
Check bolts on compressors, motor mounts, HVAC system bases and coils and tighten if required
Verify that the airflow around the remote condenser or dry cooler is unobstructed

September 2020 19 Quest IQ Evolution OMM
Specific Components Maintenance
Actual maintenance plan may vary from installation to installation, yet there are several key components from
maintenance prospective.
If needed, contact respective component manufacturer for additional maintenance information.
Filters
•Ensure air filters are clean. Dirty air filters will negatively affect HVAC system performance and lifetime
•Frequency of filters replacement will vary based on air quality, HVAC system usage, facility type, etc. Make
sure to replace filters regularly
•Replace with filters of equivalent size and rating –refer to HVAC system details (compartment stickers, etc.)
Insulation
Inspect HVAC system insulation, exposed to airstream for microbial growth (i.e., mold). If there is evidence of
microbial growth on the interior insulation, the insulation should be removed and replaced prior to operating the
HVAC system.
Air-Side Coils
•Warning: Hazardous chemicals! Cleaning agents can be highly acidic or alkaline. Handle all chemicals carefully
and use appropriate personal protective equipment (PPE). Refer to the cleaning agent manufacturer's Materials
Safety Data Sheet (MSDS) for safety and handling information. Failure to follow all safety instructions could
result in serious injury or death.
•Warning: Hazardous pressures! Coils containing refrigerant under pressure must not be cleaned using a
solution over 150 ºF. Failure to follow these safety precautions could result in coil bursting, which could result
in serious injury or death.
To clean the coil
•Disconnect all electrical power to the equipment
•Use a soft brush to remove loose debris from the coil
•Mix a high-quality coil cleaning detergent with water according to the manufacturer's instructions
•Clean coil according to detergent instructions
•Thoroughly rinse both sides of the coil and the drain pan with, clean water
•Straighten any coil fins that have been bent during the cleaning process
•Confirm the drain line is clear
•Replace all panels and parts and restore electrical power to the equipment