WaterFurnace TruClimate 700, Installation Manual

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TRUCLIMATE 700 90-140 TON  INSTALLATION MANUAL 

Water Quality

1.0. Minimum Fluid Volume

A.  Water-to-water heat pumps require a minimum amount 

of source and load side fl uid volume to ensure accurate 
and stable temperatures during system operation. 
For normal air conditioning type applications, it is 
recommended to use at least 7 gallons/ton. 

B.  Applications that require more precise temperature 

control or low loading will occur the minimum 
fl uid volume shall be no less than 10 gallons/ton. 
Installation of a buff er tank that will properly mix the 
fl uid is recommended. 

1.1. Water-to-Water Heat Pump Sizing

A.  Heat pumps should be adequately sized for optimal 

system effi

  ciency and run time. Oversizing by more 

than 15% can diminish performance resulting in higher 
power consumption, short cycling of compressors, and 
unstable conditioning temperatures.

B.  In applications where the minimum load is signifi cantly 

less than the design condition, it is better to install 2 
smaller heat pumps for load matching rather than a 
single large heat pump.

1.2. Heat Pump Piping

A.  Multiple heat pumps can be installed in series or 

parallel confi gurations. The preferred system design is 
to pipe the equipment in parallel due to its simplicity 
and fl exibility. In parallel systems, the heat pump 
equipment can vary in size as long as fl ow rate and 
system volume are accounted for. 

B.  Piping equipment in series is not desired; however, 

it can be done if proper guidelines are followed. 
Always observe proper temperature and fl ow rate 
requirements for each unit. Sometimes this method is 
desired to achieve larger temperature diff erences. 

1.3. Strainers

A.  All brazed-plate heat exchangers shall have a 

strainer within 8 ft of the water/brine inlet. It is highly 
recommended to use a minimum of 60 mesh in order 
to provide maximum fi ltration. In any case, the strainers 
should never have a mesh size less than 20.

B.  Failure to install proper stainers and perform regular 

service can result in serious damage to the unit, and 
cause degraded performance, reduced operating life 
and failed compressors. Improper installation of the 
unit (which includes not having proper strainers to 
protect the heat exchangers) can also result in voiding 
the warranty. 

C.  Strainers should be selected on the basis of acceptable 

pressure drop, and not on pipe diameter. The strainers 
selected should have a pressure drop at the nominal 
fl ow rate of the units; low enough to be within the 
pumping capacity of the pump being used.

1.4. Flow Sensing Devices

A. A 

fl ow switch or equivalent must be installed on the 

evaporator for each unit to be installed. If the unit is to 
operate as both modes (heating/cooling), a fl ow switch 
is needed on both heat exchangers. 

B. A 

diff erential pressure switch can be used in place of a 

fl ow switch. The diff erential switch must be capable of 
pressure range as indicated in the pressure drop tables.

1.5. Water Quality

A. 

General:

 Reversible chiller systems may be successfully 

applied in a wide range of commercial and industrial 
applications. It is the responsibility of the system 
designer and installing contractor to ensure that 
acceptable water quality is present and that all 
applicable codes have been met in these installations.

B. 

Water Treatment: 

Do not use untreated or improperly 

treated water. Equipment damage may occur. The 
use of improperly treated or untreated water in this 
equipment may result in scaling, erosion, corrosion, 
algae or slime. The services of a qualifi ed water 
treatment specialist should be engaged to determine 
what treatment, if any, is required. The product 
warranty specifi cally excludes liability for corrosion, 
erosion or deterioration of equipment.

The heat exchangers in the units are 316 stainless steel 
plates with copper brazing. The water piping in the 
heat exchanger is steel. There may be other materials 
in the building’s piping system that the designer may 
need to take into consideration when deciding the 
parameters of the water quality.

If an antifreeze or water treatment solution is to be 
used, the designer should confi rm it does not have a 
detrimental eff ect on the materials in the system.

C. 

Contaminated Water:

 In applications where the 

water quality cannot be held to prescribed limits, the 
use of a secondary or intermediate heat exchanger 
is recommended to separate the unit from the 
contaminated water.

The following table outlines the water quality 
guidelines for unit heat exchangers. If these conditions 
are exceeded, a secondary heat exchanger is required. 
Failure to supply a secondary heat exchanger where 
needed will result in a warranty exclusion for primary 
heat exchanger corrosion or failure.

WARNING: Must have intermediate heat exchanger 
when used in pool applications.