Lennox ECOLEAN EAC 0091 S Installation, Operating And Maintenance page 32

2.- INSTALLATION
2.5.- UNIT INSTALLATION
11.- For cooling or heat pump units the hydraulic system must contain the following components pump, buffer tank,
expansion device, safety valve, water filter, flow switch.
12.- To obtain the total water system pressure drop add the unit pressure drop + water pipework + fittings and
terminal unit pressure drops the water pump can be selected to provide the correct water flow across the
heat exchanger.
13.- A water balancing valve is advised to ensure correct water flow.
If the outside temperature in the area where the EcoLean
below 5°C, it is very important to take the following precautions to avoid that water in the circuit
freezing, that may produce damage to the components.
-If unit has to work under low outside temperatures:
∗
Do not disconnect power supply in order that water pump starts when detects water temperatures
below +5 ºC (only Hydraulic and Hydronic models).
∗
If the outside temperature where the system is to be installed or the water outlet temperature is likely
to drop below 5ºC, it is very important to use glycol anti-freeze.
The amount of anti-freeze required will vary depending on the minimum ambient temperature or the
water outlet temperature.
When the percentage of glycol increases the standard pump flow decreases, the pressure drop
increases and the cooling and thermal capacities drop. As a result the minimum flow must be
multiplied by the coefficient shown in the table:
MINIMUM AMBIENT TEMPERATURE
OR WATER OUTLET TEMPERATURE
FROM +5ºC TO 0ºC
FROM 0ºC TO -5ºC
FROM -5ºC TO -10ºC
FROM -10ºC TO -15ºC
Example: 10 % glycol in EAC0091SKHN
Minimum flow: 1,19 m 3 /h x 1.02
Pressure drop x 1.07
System capacity x 0.99
Also is advisable to use the option "evaporator anti freeze protection"
Failure to follow this advice, may result in damage to the installation.
Optionally, an immersion heater can be supplied complete with safety thermostat and pressure switch fitted
in the buffer tank of the cooling only chiller. A similar option is available for heat pump versions with the
added advantage of a supplementary heating source (Hydronic version units).
IMPORTANT
PRESSURE
ETHYLENE
DROP
GLYCOL %
10 % 1,05
20 % 1,10
30 % 1,15
1,18
35 %
31
TM
unit is to be installed is likely to drop
WATER
CAPACITIES
FLOW
COOL
1,02 0,99
1,05 0,98
1,08 0,97
1,10 0,96
HEAT
0,994
0,993
0,99
0,987