Bard GVDM-26 installation instructions General, Description, Location, Electrical Connection

GENERAL

The pump module kit should only be installed by trained technicians. These instructions serve as a guide to the technician installing the pump module kit. They are not intended as a step-by-step procedure with which the mechanically inclined owner can install the unit.

DESCRIPTION

The system is designed to heat domestic water using heat recovered from a water source unit’s hot discharge gas.

LOCATION

There are two options for the mounting location of the GVDM-26 Domestic Hot Water Desuperheater Module. First, there are pre-punched mounting holes for it on the side of the geothermal heat pump beneath the filter rack. Factory supplied in the kit are interconnect tubes that connect the pump module to the water source unit (See Figure 1).

The second is to locate the GVDM-26 on a wall adjacent to the geothermal unit or storage tank/water heater. (See Figures 3 and 4.)

Because of potential damage from freezing or condensation, the unit must be located in a conditioned space, therefore the GVDM-26 must be installed indoors. Locate the storage tank as close to the geothermal heat pump and pump module as the installation permits. Keep in mind that water lines should be a maximum of 25 feet long measured one way. Also, the vertical lift should not exceed 20 feet. This is to keep pressure and heat losses to a minimum.

ELECTRICAL CONNECTION

The GVDM-26 is equipped with a standard 115V 3-prong plug. The unit is rated at .9 amps and can normally be plugged into any convenient electrical outlet.

NOTE: Make sure outlet is grounded, and that the circuit will handle the added load. If any concerns in this regard you should run a separate grounded circuit to the main panel.

SOLDERING TUBING

NOTE: The “inlet” and “outlet” thermistors should be removed from the tubes prior to soldering/ brazing operation so they are not damaged. They are clipped onto the “DSH COIL INLET” and from “DSH OUTLET” tubes of the GVDM- 26 Module. Once soldering operations are complete, and the tubes have cooled, reattach the sensors and wrap with provided insulation.

INSTALLATION PROCEDURE – GENERAL

Before beginning the installation, turn off all power supplies to the water heater and unit, and shut off the main water supply line.

TWO TANK – In order to realize the maximum energy savings from the heat recovery system, it is recommended that a second water storage tank be installed in addition to the main hot water heater. Fossil fuel fired water heaters must be a two-tank installation. Tanks specifically intended for hot water storage are available from water heater manufacturers (solar hot water storage tanks). A well insulated electric water heater without the electric heating elements will also make a suitable storage tank.

The size of storage tank should be as large as space and economy permit but in no event should it be less than one-half of the daily water requirements for the occupants. As a guide in estimating the daily family water requirements, The Department of Energy recommends a figure of 16.07 gallons of hot water per day per individual. For example, a family of four would require 64.3 gallons per day (4 x 16.07).

ONE TANK – The single hot water tank may be a new hot water heater (sized to 100% of daily water requirements) or the existing water heater in the case of a retrofit installation. The existing water heater should be drained and flushed to remove all loose sediment. This sediment could damage the circulating pump. The bottom heating element should be disconnected.

NOTE: Make sure water heater thermostats are set below 125° on One Tank Unit.

WATER PIPING – All water piping must adhere to all state and local codes. Refer to piping diagrams for recommended one and two tank installations. Piping connections are 1/2 inch nominal copper plumbing.

A cleanable “Y” type strainer should also be included to collect any sediment.

WARNING

Never alter or plug factory installed pressure relief valve on water heater or auxiliary tank.

Manual	2100-517
Page	3 of 11