DryAIR 300GTS User manual

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Service Manual
PN# 003-702872
Apr-2016
Version 1.0
DRYAIR Manufacturing Corp.
400 Service Road,
St. Brieux, SK, Canada, SOK 3V0
Tel: [phone]
Fax: [phone]
[email protected]
DRYAIR Manufacturing Corp.
P.O Box 264
Bradner, Ohio 43406
Cell: 419-467-9902 1-888-750-1700
[e-mail]
[e-mail]

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Table of Contents
1. Warranty Policies& Claim Procedures...................................................................................1-1
Warranty Policies................................................................................................................................1-1
Basic warranty policy.................................................................................................................................... 1-1
Extended warranty policy............................................................................................................................. 1-1
Exceptions to the warranty policies ............................................................................................................. 1-2
Warranty Claim Procedure .................................................................................................................1-3
2. Safety Concerns.........................................................................................................................2-1
General Safety Guidelines ..................................................................................................................2-1
Water Heater Module..........................................................................................................................2-2
Trailer Safety ......................................................................................................................................2-2
Heat Transfer Fluid.............................................................................................................................2-2
MSDS Information..............................................................................................................................2-2
3. Generic Information .................................................................................................................3-1
Recommended Maximum Hose Lengths............................................................................................3-1
Formulas & General Information........................................................................................................3-2
Fuel Consumption...............................................................................................................................3-4
Heat Transfer Fluid (HTF)..................................................................................................................3-4
Brands ........................................................................................................................................................... 3-4
Fluid Maintenance ........................................................................................................................................ 3-4
Concentration Testing .................................................................................................................................. 3-5
Solution pH Testing....................................................................................................................................... 3-5
System Flushing ............................................................................................................................................ 3-5
Mixing Ratios ................................................................................................................................................ 3-6
Adjusting Solution Concentration................................................................................................................. 3-7
Heat Exchanger (CME) Volumes.......................................................................................................3-7
Portable Heat Exchanger Volumes.....................................................................................................3-8
4. DRYAIR Components ..............................................................................................................4-1
Heat Exchangers .................................................................................................................................4-1
Elevation Concerns ....................................................................................................................................... 4-1
Setting up for Higher Elevations ................................................................................................................... 4-1
Reconditioning Procedures.................................................................................................................4-3
Water Heater’s Heat Exchanger Cleaning Procedure.........................................................................4-4
SERVICE TIPS...................................................................................................................................4-6
SMOKE TESTING............................................................................................................................................ 4-6
FUEL PUMP ................................................................................................................................................... 4-6
NOZZLES........................................................................................................................................................ 4-6

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DRAFT ........................................................................................................................................................... 4-7
STACK TEMPERATURE CONDITIONS............................................................................................................. 4-7
Riello F40 Trouble Shooting Chart....................................................................................................4-9
Hose Reel..........................................................................................................................................4-10
Reconditioning Procedure .......................................................................................................................... 4-10
Plate Heat Exchanger........................................................................................................................4-10
Reconditioning Procedure .......................................................................................................................... 4-10
Mixing/Booster.................................................................................................................................4-11
Reconditioning Procedure .......................................................................................................................... 4-11
Portable Heat Exchangers.................................................................................................................4-11
Reconditioning Procedure .......................................................................................................................... 4-11
Manifolds..........................................................................................................................................4-11
Reconditioning Procedure .......................................................................................................................... 4-11
Hoses.................................................................................................................................................4-12
Reconditioning Procedure .......................................................................................................................... 4-12
5. Plumbing Components..............................................................................................................5-1
Y-Strainer............................................................................................................................................5-1
Safety Relief Valve.............................................................................................................................5-2
Pressure Bypass Valve........................................................................................................................5-3
Drain Valve.........................................................................................................................................5-3
Cold Start Fluid Pre-Heater (if equipped)...........................................................................................5-4
Thermostatic Control Valve................................................................................................................5-4
Automatic Air Bleed Vent..................................................................................................................5-4
Flow Reverser Valves.........................................................................................................................5-5
6. Electrical Components..............................................................................................................6-1
Flow Reverser.....................................................................................................................................6-1
Aquastats.............................................................................................................................................6-4
Flame Roll-Out Switch (Figure 6-17).................................................................................................6-7
Flow Switch (Figure 6-18)..................................................................................................................6-8
High Limit Control (Manual Reset) (Figure 6-20) .............................................................................6-9
High Limit Control (Automatic Reset) (Figure 6-21).........................................................................6-9
High Pressure Switch............................................................................Error! Bookmark not defined.
Ignition Module (Figure 6-22)..........................................................................................................6-10
Low Pressure Switch.........................................................................................................................6-10
Low Water Cut-Off...........................................................................................................................6-10
Main Gas Valve (2 Stage) (Figure 6-25) ..........................................................................................6-12
Micro Switch (Figure 6-26)..............................................................................................................6-13
Pilot Valve (Figure 6-27)..................................................................................................................6-13

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Proportional Temperature Control (Figure 6-28) .............................................................................6-13
Pumps (Figure 6-29) .........................................................................................................................6-14
Redundant Valve 100% Shut Off .....................................................................................................6-14
Solenoid Valve 100% Shut Off.........................................................................................................6-14
Thermostat (Figure 6-32)..................................................................................................................6-15
Transformer.......................................................................................................................................6-15
Valve Actuator (Figure 6-33)............................................................................................................6-15
Adjustable FrequencyDrive..............................................................................................................6-16
7. Optional Equipment..................................................................................................................7-2
Generators...........................................................................................................................................7-2
8. Appendix....................................................................................................................................8-1
Electrical Schematics..........................................................................................................................8-1
Model GTS 2100-0300 .................................................................................................................................. 8-1
Model GTS 2100-0600, 2100-0900............................................................................................................... 8-3
Model 2100-0900 FLEX................................................................................................................................. 8-4
Model CHU 2000-1200 ................................................................................................................................. 8-5
Model CHU 2100-0400, 2100-0600, 2100-0900, 2100-1200 ....................................................................... 8-8
Model Steam Plate –HESF 1000................................................................................................................... 8-9
Model HE80 Fan Coil................................................................................................................................... 8-14
Model HE200 Fan Coil................................................................................................................................. 8-13
Model HE600 Fan Coil................................................................................................................................. 8-15
Model MAXCOIL.......................................................................................................................................... 8-16
Model Hose Reel HR2250 ........................................................................................................................... 8-17
Model Hose Reel HR6000 ........................................................................................................................... 8-18
Model Hose Reel HRA series....................................................................................................................... 8-19
Model Mixing Booster ................................................................................................................................ 8-20
Model Pump Booster Mixing Valve ............................................................................................................ 8-21
Model Plate Heat Exchanger Glycol to Glycol ............................................................................................ 8-16
Model Humidistat Fan Coil Control ............................................................................................................ 8-17
9. Weights and Dimensions...........................................................................................................9-1
10. MATERIAL SAFETY DATA SHEET..................................................................................10-1
11. Operator Notes ........................................................................................................................11-1

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Table of Figures
Figure 2-1 Safety Decals.................................................................................................................................Error! Bookmark not defined.
Figure 3-1 One Way........................................................................................................................................Error! Bookmark not defined.
Figure 3-2 Two Way........................................................................................................................................Error! Bookmark not defined.
Figure 3-3 Manifold to Portable Heat Exchanger...........................................................................................Error! Bookmark not defined.
Figure 3-4 Ground Thaw Loops......................................................................................................................Error! Bookmark not defined.
Figure 3-5 Refractometer............................................................................................................................................................................3-5
Figure 3-6 pH Tester...................................................................................................................................................................................3-5
Figure 4-1 Smoke Scales .............................................................................................................................................................................4-1
Figure 4-2 2000-1200 Orifices....................................................................................................................................................................4-1
Figure 4-3 Spot Smoke Tester .....................................................................................................................................................................4-1
Figure 4-4 Flue Gas Analyzer.....................................................................................................................................................................4-1
Figure 4-5 2000-1200 Exploded..................................................................................................................................................................4-4
Figure 4-6 2100-0300 Exploded..................................................................................................................................................................4-5
Figure 4-7 2100-xxxx Exploded...................................................................................................................................................................4-5
Figure 5-1 Strainer Screen..........................................................................................................................................................................5-1
Figure 5-2 'Y'- Strainer................................................................................................................................................................................5-1
Figure 5-3 Safety Relief Valve.....................................................................................................................................................................5-2
Figure 5-4 Pressure Bypass Valve ..............................................................................................................................................................5-3
Figure 5-5 Drain Valve...............................................................................................................................................................................5-3
Figure 5-6 Cold Start Fluid Pre-Heater......................................................................................................................................................5-4
Figure 5-7 Thermostatic Control Valve.......................................................................................................................................................5-4
Figure 5-8 Automatic Air Bleed Vent..........................................................................................................................................................5-4
Figure 5-9 Flow Reverser Schematic ..........................................................................................................................................................5-5
Figure 5-12 Flow Reverser Schematic ........................................................................................................................................................5-8
Figure 6-1 Flow Reverser Actuator Wiring.................................................................................................................................................6-1
Figure 6-2 Electrical Panel.........................................................................................................................................................................6-1
Figure 6-3 Transformer Wiring...................................................................................................................................................................6-2
Figure 6-4 Short Electrical Strip.................................................................................................................................................................6-2
Figure 6-5 Timer Wiring .............................................................................................................................................................................6-2
Figure 6-6 Flow Reverser Actuator Wiring.................................................................................................................................................6-2
Figure 6-7 Electrical Panel.........................................................................................................................................................................6-3
Figure 6-8 Transformer Wiring...................................................................................................................................................................6-3
Figure 6-9 Short Electrical Strip.................................................................................................................................................................6-3
Figure 6-10 Timer Wiring ...........................................................................................................................................................................6-3

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Figure 6-11 A421 ........................................................................................................................................................................................6-4
Figure 6-12 Long Electrical Strips..............................................................................................................................................................6-4
Figure 6-13 A419 ........................................................................................................................................................................................6-5
Figure 6-14 Johnson (A350A/B) Electronic Temperature Control..............................................................................................................6-6
Figure 6-15 Johnson (S350C Temperature Slave Stage Module)................................................................................................................6-6
Figure 6-16 Flame Roll Out Switch.............................................................................................................................................................6-7
Figure 6-17 Flow Switch.............................................................................................................................................................................6-8
Figure 6-18 Flow Switch Power Connections.............................................................................................................................................6-8
Figure 6-19 High Limit Control (Manual Reset).........................................................................................................................................6-9
Figure 6-20 High Limit Control (Automatic Reset).....................................................................................................................................6-9
Figure 6-21 Ignition Module....................................................................................................................................................................6-10
Figure 6-22 Model –Safgard 650.............................................................................................................................................................6-11
Figure 6-23 Model - Guard Dog (PS-851-M-120)....................................................................................................................................6-11
Figure 6-24 Honeywell (V8944B) & (V8944C).........................................................................................................................................6-12
Figure 6-25 Micro Switch BZE6-2RN2.....................................................................................................................................................6-13
Figure 6-26 Basotrol H91WG-1................................................................................................................................................................6-13
Figure 6-27 Johnson A350PS-1C..............................................................................................................................................................6-13
Figure 6-28 Goulds Pumps........................................................................................................................................................................6-14
Figure 6-29 Honeywell V88A....................................................................................................................................................................6-14
Figure 6-30 Honeywell V5055...................................................................................................................................................................6-14
Figure 6-31 Johnson A19ABA...................................................................................................................................................................6-15
Figure 6-32 Honeywell ML7984 ...............................................................................................................................................................6-15
Figure 6-33 Penta Power (KBVF).............................................................................................................................................................6-16
Figure 6-34 ATV11....................................................................................................................................................................................6-16
Figure 8-1 Model GTS 2100-0300 ..............................................................................................................................................................8-1
Figure 8-2 Model GTS 2100-0600, 2100-0900 ...............................................................................................Error! Bookmark not defined.
Figure 8-3 Model 2100-0900 FLEX................................................................................................................Error! Bookmark not defined.
Figure 8-4 Model CHU 2000-1200.................................................................................................................Error! Bookmark not defined.
Figure 8-5 Model CHU 2100-0400, 2100-0600, 2100-0900, 2100-1200........................................................Error! Bookmark not defined.
Figure 8-6 Model Steam Plate –HESF 1000..............................................................................................................................................8-9
Figure 8-7 Model HE80 Fan Coil.............................................................................................................................................................8-14
Figure 8-8 Model HE200 Fan Coil...........................................................................................................................................................8-13
Figure 8-9 Model HE600 Fan Coil...........................................................................................................................................................8-15
Figure 8-10 Model MAXCOIL ..................................................................................................................................................................8-16
Figure 8-11 Model Hose Reel HR2250 .....................................................................................................................................................8-17

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Figure 8-12 Model Hose Reel HR6000 .....................................................................................................................................................8-18
Figure 8-13 Model Hose Reel HRA series.................................................................................................................................................8-19
Figure 8-14 Model Mixing Booster...........................................................................................................................................................8-20
Figure 8-15 Model Pump Booster Mixing Valve.......................................................................................................................................8-21
Figure 8-16 Model Plate Heat Exchanger Glycol to Glycol .....................................................................................................................8-16
Figure 8-17 Model Humidistat Fan Coil Control......................................................................................................................................8-17
Table of Tables
Table 3-1 Fuel Consumption.......................................................................................................................................................................3-4
Table 3-2 pH................................................................................................................................................................................................3-5
Table 3-3 Mixing Ratios..............................................................................................................................................................................3-6
Table 3-4 Heat Exchanger Volumes............................................................................................................................................................3-7
Table 3-5 Hose Volumes..............................................................................................................................................................................3-7
Table 3-6 Potable Heat Exchanger Volumes...............................................................................................................................................3-8
Table 4-1 Flue Gas Analyzer Results.............................................................................................................................................................4-2
Table 4-2 Service Tips.................................................................................................................................................................................4-6
Table 6-1 A421 Settings...............................................................................................................................................................................6-5
Table 6-2 A419 Setting................................................................................................................................................................................6-5
Table 6-3 Sensor Readings..........................................................................................................................................................................6-7
Table 6-4 VFD Trouble shooting...............................................................................................................................................................6-16
Table 9-1 Weights and Dimensions.............................................................................................................................................................9-1

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Version 0.0
PN 003-702872
Warranty Policies& Claim Procedures 1-1
1.Warranty Policies& Claim Procedures
DRYAIR MANUFACTURING CORP.(referred to within as DRYAIR) warranties its new
,
unused equipment to be free of defects in material and workmanship at the time of delivery to the
original retail purchaser.
Warranty Policies
Basic warranty policy
•DRYAIR will repair or replace, at its option, without charge, any defective part of the
equipment for a period of twelve (12) months from delivery to the first retail purchaser,
F.O.B St. Brieux, SK., Canada or Bowling Green, Ohio.
•Any parts that are covered by an extended warranty published by DRYAIR are an exception
to the Basic Warranty policy and are to be warranted as per the details of the Extended
Warranty Policy.
•Labor is covered as per DRYAIR flat labor rate.
•The Warranty Policy, terms and conditions, may change from time to time without prior
notice.
•Warranty terms and conditions are transferable in the event of the sale to a second owner.
•Replacement parts will be warranted for 90 days from the repair date. Bill of sale must
accompany the warranty claim.
•The terms of this Warranty Policy are subject to provincial and state legislation. DRYAIR
reserves the right to make modifications in accordance with provincial and state legislation
without prior notice or obligation.
Extended warranty policy
Heat
exchanger
•An extended warranty is available on the heat exchanger unit of the water heater assembly.
The available warranty for a part, under the extended warranty policy, is prorated by 20% per
year.
•(Shipment date is the date to be used for the commencement of the warranty period).
•Coverage schedule
Year 1 - 100%
Year 2 - 80%
Year 3 - 60%
Year 4 -40%
Year 5 - 20%

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Warranty Policies& Claim Procedures 1-2
Exceptions to the warranty policies
•Under no circumstance shall the owner be entitled to recover costs for incidental, special or
consequential damages such as, but not limited to: loss of profit or revenue, other
commercial losses, inconvenience and/or replacement equipment rental cost.
•Maintenance, repair or service items not related to warrantable defects.
•Loss or damage during shipping.
•Failure resulting from lack of or improper maintenance.
•Damage caused by operator abuse, negligence or improper operation.
•Damage resulting from improper voltage supply.
•Damage from improper installation. Installation done by other than the manufacturer.
•Non-defective items replaced at the request of the customer.
•Damage due to accidents.
•Damage resulting from improper fuel supply (i.e. pressure or contamination).
•Damage resulting from cracked or broken lines occurring during transport.
•Damage resulting from use of inadequate or improper fluids (i.e. Glycol or oil).
•Mileage is not covered.
•Glycol is considered a consumable and will not be covered under warranty policy.
•Generators carry their own warranty coverage through their own manufactures. Please refer
generator issues to the OEM. Contact information may be found in the Service & Operators
Manual under Optional Equipment.
Owner obligations
•It is the responsibility of the owner, at the owner's expense, to transport the equipment to the
service facility of an authorized DRYAIR distributor/dealer or alternately to reimburse the
distributor/dealer, for any traveling expenses incurred in fulfilling this warranty.
•The terms of this Warranty Policy are subject to provincial and state legislation. DRYAIR
reserves the right to make modifications in accordance with provincial and state legislation
without prior notice or obligation.
•It is the responsibility of the owner to read, understand and implement the maintenance, safety
and operational guidelines as laid out in the Operation and Maintenance Guide.
•All parts to be tagged with warranty claim number and shipped prepaid to DRYAIR within 30
days.
Manufacture obligations
•DRYAIR reserves the right to continually improve the product’s parts or specifications at any
time without notice or obligation.
•The terms of this Warranty Policy are subject to provincial and state legislation. DRYAIR
reserves the right to make modifications in accordance with provincial and state legislation
without prior notice or obligation.

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Warranty Policies& Claim Procedures 1-3
Warranty Claim Procedure
•All warranty credits must be processed with the DRYAIR Warranty Claim Form.
•All warranty parts, unless otherwise specified, are to be returned to DRYAIR along with a
completed Warranty Claim Form.
Note: Prior to returning warranty parts, please call for an authorization number and
shipping instructions from the Warranty department in Canada.
Location of Warranty Depots
USA
DRYAIR Manufacturing
Corp.
410 Douglas Rd
Bradner. Ohio
43406
Ph. 419-467-9902
Canada
DRYAIR Manufacturing Corp.
400 Service Road
Box 126
St. Brieux, SK
S0K 3V0
Ph. 1 [phone]
•Each warranty claim should only refer to one Serial or Production Schedule numbered unit.
•Warranty parts are to be tagged with warranty claim number.
•When claiming for warranty labor, the allowable warranty labor rate will be $85.00/hour. The
factory reserves the right to adjust the number of hours claimed where deemed necessary.
•The factory may at times specify allowable labor for certain warranty procedures.
•Mileage and travel time, to and from the customer are not eligible for warranty credit.
•Freight charges for warranty parts are not eligible for warranty credit.
•Labor flat rates for component changes
•Electrical Components -0.5hr
•Relays
•Switches
•Thermostats
•Breakers
•Electric Motor Changes -1hr
•Hose Reel
•Plumbing Components -1hr
•Flow Reverser
•Flow Switch
•Valves
•Glycol Pump Changes -2hrs
Note: Other labor charges will be at the discretion of DRYAIR

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Safety Concerns 2-1
2.Safety Concerns
General Safety Guidelines
•Make certain that the operator reads and understands all the information in this manual.
•All unauthorized people must be kept away from the equipment when in operation.
•Maintain instructional and safety decals. Replace
damaged decals (Figure 2-1).
•All guards must be in place when the equipment
is in operation.

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Safety Concerns 2-2
Water Heater Module
CAUTION! The water heater is a heating appliance.
•When dealing with any heating appliance, observe all posted warnings and cautions.
•Keep children and pets away from all piping and fuel
accessories.
•The water heater housing panels must be kept closed when the system is operating.
This prevents drafts from affecting water heater operation.
•It strongly recommended
Trailer Safety
• Ensure that all the tires are inflated to the manufactures specification.
• Check the tire tread on all tires for indications of wear, or misalignment.
• Test the signal lights, brake lights, and park lights for proper operation.
• All Dryair trailers are equipped with electric brakes that require a controller in
the tow vehicle.
o The operator must make sure that the brakes are functioning
correctly.
• Before towing the operator of the tow vehicle must ensure that the trailer is
hooked correctly to the tow vehicle including;
o Safety chains
o Brake away cable
o Lights
• Reduce your speed.
Heat Transfer Fluid
Absolutely NO use of ethylene glycol or automotive
antifreeze. Warranty will be voided if use of improper heat
transfer fluid. Must use PROPLYENE GLYCOL ONLY.
For complete "heat transfer fluid" information, refer to the Material Safety Data Sheets for
“Dowfrost HTF” & "Boss Chill PG" in this section.
MSDS Information
For MSDS information regarding Glycol please see the appendix.

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Generic Information 3-1
3.Generic Information
Recommended Maximum Hose Lengths
“Central Heating Unit”to “Manifold”
•One way –300 feet (Figure 3-1)
•Two way –400 feet each way (Figure 3-2).
“Manifold” to “Portable Heat Exchanger”
•100 feet (Figure 3-3).
Ground Thaw Loops
•500 foot loops
•Max up to 1000
feet by using
two hoses
together (Figure
3-4).

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Generic Information 3-2
ADD DIAGRAM OF UNIT GOING UP 70 FT THEN ALSO GOING UP WITH PLATE HEAT EXCHANGER.
Formulas & General Information
Hose length required for ground thaw or concrete curing.
Where: L
H
= Hose Length required to cover area.
SF= Area of ground to be thawed or concrete to cure.
H
SP
= Hose spacing in feet;
• 1.5’ Ground Thawing @ 84 BTU/ft typically
• 2’ Curing Concrete @ 50 BTU/ft typically
Example:
An area of 7500ft
2
to be thawed.
WhatsizeofGTSwouldberequired?
ft
BTU
ftBTU
ft
BTU
ftMachine
ft
BTU
LMachine h
845000000,420
845000
84
=
=
=
ThisindicatesthataGTS600woulddothejob.Howeverextrahosesmayberequired.
Glycolweightcalculation;
Where: WG=WeightofGlycol
SG=SpecificGravityofGlycol
(FromtheMSDSofthe
Glycolproduct)
SP
HH
SF
L=
ftft
LH5.1
7500 2
=
ftft
ft 5.1
7500
5000 2 =
USGallon
lbs
SGW
liter
Kg
SGW
G
G
345.8
1
=
=

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Generic Information 3-3
This section will cover a typical setup
using a complete DRYAIR system.
Because this is a closed system it is
possible to go vertically up to 70ft from
the heat source. This makes it ideal in a
multi-story construction application.
Connections to the primary side are
accomplished by 2in camlock style
fittings.

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Generic Information 3-4
Fuel Consumption
Table 3-1 Fuel Consumption
Model #
btu/hr
input
gallons/hour
liters/hour
cuM/hour
cuF/hour
2000-1200 Natural Gas
1,233,000
N/A
N/A
34.86
1,233
2000-1200 Propane
1,134,360
12.4
46.9
N/A
N/A
2000-0250 NG
248,000
N/A
N/A
7
248
2000-0250 Propane
248,480
2.7
10.3
N/A
N/A
2100-0300 Oil Fired
223,000
1.75
6.6
N/A
N/A
2100-0600 Oil Fired
620,200
4.4
16.7
N/A
N/A
2100-0900 Oil Fired
896,000
6.4
24.2
N/A
N/A
200 GTS Oil Fired
212,800
1.52
5.75
N/A
N/A
400 GTS Oil Fired
348,000
2.45
9.13
N/A
N/A
650 GTS Oil Fired
620,200
4.4
16.7
N/A
N/A
Heat Transfer Fluid (HTF)
Brands
The HTF is a 60/40 mixture of Propylene Glycol and pure water.
• Dowfrost (Propylene Glycol)
• Boss Chill PG (Propylene Glycol)
Fluid Maintenance
The HTF solution must be checked at least once a year in accordance with the manufacturer’s
recommendations. A baseline analysis should be performed within two to four weeks of
initial mixing. This measurement will be used to verify that the fill was completed properly,
and will serve as a reference point for comparison with future test results. As a bare
minimum, the solution should be analyzed for glycol concentration, solution pH and general
quality. Dryair recommends that a complete flush and HTF replacement every five years.

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Generic Information 3-5
Concentration Testing
The refractometer (Figure 3-5) is used to check the freeze point of the HTF.
Concentration can be easily and accurately checked using a handheld
refractometer. Most quality instruments will test glycol concentrations from
0 to 55% directly, are portable, and require no complicated adjustments for
temperature. System concentration should not vary significantly from test to
test.
Solution pH Testing
While high quality HTF solutions may last in excess of 20 years, hard use, improper
maintenance or chemical contaminants will significantly shorten fluid life. Fluid pH serves as a
good barometer for the condition of the HTF and is best measured with
a field pH meter. This method is significantly more accurate than
litmus paper tests. The pH tester (Figure 3-6) is used to check the pH
level of the heat transfer fluid. Below is a pH chart. For Dryair product,
anything below 7 is unacceptable.
Table 3-2 pH
System Flushing
Should the system require
cleansing after removing old or damaged HTF, flush the
system with a heated 1-2% solution of trisodium
phosphate for 2 to 4 hours, then drain and rinse
thoroughly. Flushing the system after any plumbing
repair/replacement is also highly recommended in order
to remove excess pipe dope and cutting oils.
pH
Description
< 5.5
=
=
=
=
=
=
=
=
=
Strongly acid
5.5 - 5.9
Medium acid
6.0 - 6.4
Slightly acid
6.5 - 6.9
Very slightly acid
7
Neutral
7.1 - 7.5
Very slightly alkaline
7.6 - 8.0
Slightly alkaline
8.1 - 8.5
Medium alkaline
> 8.5
Strongly alkaline
Figure 3-1 Refractometer
Figure 3-2 pH Tester

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Generic Information 3-6
Mixing Ratios
Table 3-3 Mixing Ratios
Percent Propylene Glycol
Freezing Point
By Mass
By Volume
°F
°C
0.0
0.0
32.0
0.0
10.0
9.6
26.1
-3.2
20.0
19.4
17.9
-7.8
30.0
29.4
6.7
-14.0
40.0
39.6
-8.1
-22.3
50.0
49.9
-28.9
-33.8
60.0
60.0
-54.9
-48.3