Unit Installation
To ensure against leaks and possible heat exchanger fouling,
use an appropriate thread sealant when connecting water
piping connections to the unit.
DO NOT overtighten the connections.
Install ball valves in the supply and return lines for unit isolation
and unit water flow balancing.
EC units are supplied with a copper or an optional cupronickel
conden
ser. Copper is adequate only for ground water that is not
high in mineral content. (Refer to Table 8 on page #22.)
NOTICE
Proper testing is required to ensure the well water quality is
suitable for use with water source equipment.
In conditions anticipating moderate scale formation or in
brackish water, a cupronickel heat exchanger is recommended.
(Refer to the Water Quality Table on page #22.) Water quality
must meet the standards stated in the table.
Both the supply and discharge water lines will sweat if
subjected to low water temperature. Insulate lines to prevent
damage from condensation.
All manual flow valves used in the system must be ball valves.
Globe and gate valves must not be used due to high-pressure
drops and poor throttling characteristics.
Pressure/temperature ports are recommended in both the
supply a
nd return lines for system flow balancing and
determining the system capacity versus rated conditions. The
water flow can be accurately set by measuring the
water-to-refrigerant heat exchangers water-side pressure drop.
See the
unit specification sheets for the water flow and pressure
drop information.
NOTICE
DO NOT expose water piping to freezing ambient
temperatures.
NOTICE
Never exceed the recommended water flow rates as serious
damage or erosion of the water-to-refrigerant heat exchanger
could occur.
Always check carefully for water leaks and repair appropriately.
5.9.1 Installation of Pressure Regulating Valves
Pressure regulating valves are used to increase or decrease water
flow thr
ough the heat pump in response to refrigerant pressure.
In some cases, more water may be required in heating than in
cooling, or vice versa. With the EC heat pumps, these valves are
not required. However, if installed, a pair of valves are required
for proper operation, one valve for cooling (direct acting) and
another valve for heating (indirect acting).
5.9.2 Discharge Water
The discharge water from the heat pump is not contaminated in
any man
ner and can be disposed of in various ways depending on
local building codes (for example: discharge well, dry well, storm
sewer, drain field, stream or pond, etc.) Most local codes forbid
the use of a sanitary sewer for disposal. Consult your local
building and zoning department to insure compliance in your
area.
5.9.3 Antifreeze
NOTICE
Antifreeze solution is required for all closed-loop applications.
Sufficient antifreeze solution is required to protect against
extreme conditions and equipment failure. Frozen water coils
are not covered under warranty.
In areas where entering loop temperatures drop below 40°F or
where piping will be routed through areas subject to freezing,
antifreeze is needed. Alcohols and glycols are commonly used as
antifreeze agents. Freeze protection must be maintained to 15°F
below the lowest expected entering loop temperature. For
example, if the lowest expected entering loop temperature is
30°F, the leaving loop temperature would be 22°F to 25°F.
Therefore, the freeze protection must be at 15°F
(30°F-15°F=15°F).
14 |
EC Series Heat Pumps — 8733841499 (2024/05)
To Next Page
