AUX EL Series Instrukcje Operacyjne Pobierz pdf (Strona 9)

09/11/2014 7 NI401

Figure 1

Horizontal Closed Loop

Mechanical Installation Overview

This NorthStar Series unit cannot correct airflow problems inherent within the duct work system. The following

items should be carefully considered and properly followed for all installations:

Examination of the existing forced air furnace – Prior to starting this installation, examine the total furnace

system and make necessary comments or recommendations to the homeowner. Remember, if a marginal

condition exists within the existing duct work system, the installation of a geothermal heat pump will not cure

PRE-EXISTING conditions. Consider such items as adequate cold air return and adequate supply duct and

room register (1 register per 100 CFM) etc.

Heating capacity – Size the geothermal heat pump according to the normal heating requirements as the

building exists today. Do not necessarily match to the existing furnace nameplate because it may be oversized.

Do not oversize the geothermal heat pump.

Other plenum equipment – Auxiliary equipment such as humidifiers, zone plenum dampers, etc., located

within the plenum which may cause a non-uniform airflow issues may have to be removed if they cause

excessive reduction to system airflow. Zone dampers within the trunk line at least 12" (30.5 cm) from the coil

typically pose no problems. When horizontal zone dampers are involved, perform all check-out functions with

smallest zone open first.

Comment – zone dampers cause back pressure on the blower and overall reduced airflow. Reduced

airflow can cause the geothermal unit to perform poorly or in some cases cause icing or freeze ups in

the geo loop or air coil.

Insufficient cold air return capacity – Installation experience indicates this is a major concern. In fact, it

could represent a problem in as many as 60% of the installations, especially if there is a requirement to increase

airflow when the existing cold air return capacity is already undersized or restricted. Check the static pressure

within the return cabinet or the suction at the filter cabinet door. Do not assume because there is a register on

the wall, the hole behind the register or the passageways are equal to this register. Sharp offsets and transitions

in the cold air return system often cause severe restrictions. Expect to add additional registers or a relief register

in the main cold air return duct.

Closed Loop Applications – Closed loop system re-circulates the same water/antifreeze solution through a

closed system of underground high-density polyethylene pipe. As the solution passes

through the pipe it collects heat (in the heating mode) that is being transferred

from the relatively warm surrounding soil through the pipe and into the

relatively cold solution. The solution is circulated back to the heat pump that

extracts its heat and then returns to the ground to absorb more heat from the

earth. Earth loops must be sized properly for each particular geographic area

and individual capacity requirements.

The NorthStar Series heat pumps are designed to operate on either vertical

or horizontal closed loop applications. (Figures 1 & 2) Vertical loops are typically

installed with a well drilling rig up to 200 feet (61 meters) deep or more. Horizontal

systems are typically installed with excavating or trenching equipment approximately

six to eight feet deep, depending on geographic location and length of pipe used.

Lake or Pond Loops – Closed loop systems may also be used in lakes or rivers

to supply a heat source to the heat pump. Typically a loop consisting of

geothermal pipe can be designed and placed in an area not much deeper than

15ft (4.5 meters) with some water currents present. In any lake or pond,

municipal and area codes must be observed in regards to a lake or pond loop.

The use of an environmentally friendly loop fluid like ethanol should be

considered should damage ever occur to the loop. Consult an IGSHPA or CGC

certified installer for proper lake or pond loop design.

Figure 2

Vertical

Closed Loop

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