14
18-GL07D1-4
2GN SPLIT INSTALLER’S GUIDE
Figure 11: Hot Water Generator Installation in Preheat Tank
Figure 10: Typical Hot Water Generator Installation
Drain Valve
In
P/T Relief
Valve
Cold
Water In
Hot
Water Out
DHW
Water In
DHW
Water Out
Venting Waste Valve
or Vent Coupling
3/4˝ x 3/4˝ x 1/2˝ tee
Drain Valve
Drain Valve
In
P/T Relief
Valve
Venting Waste Valve
or Vent Coupling
DHW
DHW
3/4˝ x 3/4˝ x 1/2˝ tee
Water In
Hot
Water Out
Cold
Water In
Water Out
P/T Relief
Valve
HOT WATER GENERATOR
CONNECTIONS
The heat reclaiming hot water generator coil is of vented
double-wall copper construction and is suitable for potable
water. To maximize the benefi ts of the hot water generator a
minimum 50-gallon water heater is recommended. For higher
demand applications, use an 80-gallon water heater or two
50-gallon water heaters connected in a series as shown below.
A geo storage tank should not be used in this application
unless it is plumbed in series with an electric water heater. The
geo storage tank is equipped with a single 4500 Watt element
and will not be able to provide adequate water heating if used
as a standalone water heater. Electric water heaters are
recommended. Make sure all local electrical and plumbing
codes are followed when installing a hot water generator.
Residential units with hot water generators contain an internal
circulator and fi ttings. A water softener is recommended for
hard water applications (greater than 10 grains or170 ppm
total hardness.
Note:
Under certain conditions, 2GN Series dual capacity
units operate with very low refrigerant discharge temperatures,
producing little or no water heating capability. This scenario
occurs when the unit is operating with cold entering source
water (loop or well). Allowing the hot water generator pump
to operate during these conditions actually removes heat
from the DHW circulating through the unit. To overcome this,
2GN Series unit microprocessors have been programmed
to disengage the hot water generator pump during such
conditions. (During low capacity cooling operation, the pump
will operate only if the DHW temperature entering the unit is
less than the liquid line temperature plus 35º F. During high
capacity cooling operation, the pump will operate only if the
DHW temperature is less than the liquid line temperature
plus 60º F.) Using a preheat tank, as shown in Figure 11, will
maximize hot water generator capabilities.
Water Tank Preparation
To install a unit with hot water generator, follow these
installation guidelines.
1. Turn off the power to the water heater.
2. Attach a water hose to the water tank drain connection
and run the other end of the hose to an open drain or
outdoors.
3. Close the cold water inlet valve to the water heater
tank.
4. Drain the tank by opening the valve on the bottom of
the tank, then open the pressure relief valve or hot
water faucet.
5. Flush the tank by opening the cold water inlet valve to
the water heater to free the tank of sediments. Close
when draining water is clear.
6. Disconnect the garden hose and remove the drain
valve from the water heater.
7.
Refer to Plumbing Installation and Hot Water Generator
Startup.
CAUTION
!
Elements will burn out if energized dry.
Содержание 2GN Series
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