SMC Networks HRS Series - Operation at Low Ambient Temperature or Low Circulating Fluid Temperature

DOC1001322
Chapter 3 Transport and Setting Up
HRS Series 3.2 Installation
3-5
● Location without adequate space for maintenance as required.
● Location that is exposed to splash of water that is higher than IPX4.
● For the product installation or operation in accordance with UL standards, see below.
 Thermo-chiller installation at high altitude of 1000 meters or more
Due to the lower air density, the heat radiation efficiencies of the devices in the product will be lower at an
altitude of 1000m or higher. For this reason, the maximum ambient temperature for the thermo-chiller
operation and the cooling capacity will be reduced.
For product installation at a place of high altitude of 1000 meters or more, select a thermo-chiller of the
applicable capacity referring to the table below.
1. Max. ambient temp.: Use the product in lower ambient temperature than the described value at each
altitude.
2. Cooling capacity correction coefficient: Coefficient to calculate the cooling capacity at each altitude
For the product operation at an altitude of 1800 meters,
the cooling capacity = “8.4 Cooling Capacity” x 0.8.
 Installation/Operation in accordance with the UL standard
The product cannot be used in the environment shown below:
● Environment at an altitude of 2000 meters or more
● Environment at a pollution degree of 3 or more
3.2.2 Operation at low ambient temperature or low circulating fluid
temperature
(1) Circulating fluid
In order to avoid freezing of the circulating fluid, use aqueous solution of ethylene glycol.
Ambient temperature (°C)
Recommended circulating fluids
10 to 45
Tap water, ethylene glycol aqueous solution 15(wt.)%
-5 to 10
Ethylene glycol aqueous solution 15(wt.)%
Circulating fluid
temperature(°C)
Recommended circulating fluids
10 to 35
Tap water, ethylene glycol aqueous solution 15(wt.)%
5 to 10
Ethylene glycol aqueous solution 15(wt.)%
(2) And following instructions must be executed. If following instructions are not executed, not
only Thermo-chiller alarm will be generated, but also damage of the product can result.
- Power has to be supplied to the Thermo-chiller all the time.
- Turn on anti-freezing function (set parameter: SE.10) all the time.
Refer to “KEY-LOCK, START-UP operating method, ANTI-FREEZING and
WARMING-UP”(P.5-42) for the setting.
- When the power supply to the Thermo-chiller is stopped for a long period of time,
discharge all the circulating fluid in the Thermo-chiller and customer's device and
piping. When the Thermo-chiller is refilled with the circulating fluid, supply the fluid
at normal temperature.
Altitude [m]
1. Max. ambient
temp. [
o
C]
2. Cooling capacity
correction coefficient
Less than 1000m
45
1.00
1000m or more - Less than 1500m
42
0.85
1500m or more - Less than 2000m
38
0.80
2000m or more - Less than 2500m
35
0.75
2500m or more - Less than 3000m
32
0.70