EarthLinked GSTE-119, Installation, Operation & Maintenance Manual

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SWH-IOM (08/10) Page 21
6. Operation
The GSTE storage water heater operates in conjunction with the other components of the
EarthLinked
®
system. Entire system operational functions are detailed in EarthLinked
®
system
manuals. The following operational functions pertain only to the storage water heater.
HHK-1872 Temperature Control Setting
The temperature control setting on the storage water tank/heater, ETI Model HHK-1872, is set
at the time of start-up. For optimum
Commercial Water Heating (CWH) system performance,
the temperature control setting should be limited to a maximum water temperature rise
through the compressor unit of 60F. The following lists the maximum temperature control
set points, based on the cold water supply temperature:
Cold Water Supply Temperature, °F Max. Temperature Control Set Point, °F
55 and above 110
45 105
40 100
Freeze Protection
In the event that the compressor unit and GSTE storage water heater system is to be shut
down for extended periods of time with surrounding air temperature below 32°F, the system is
to be drained of water, to prevent freezing damage to the compressor unit, storage water
heater and other interconnected piping components.
Hydronic Heating and Chilled Water Cooling Systems
When the GSTE storage water heater is applied to hydronic systems and anti-freeze solution
is utilized, ETI recommends the preferred use of propylene glycol (non-toxic) in the appropriate
mixture percentage with water. Ethylene glycol solution is also an acceptable anti-freeze.
GSTE as Booster Heater
When the GSTE storage water heater is applied as a booster heater in tandem with a storage
water tank (which stores water at 110F maximum) for the purpose of raising the water
temperature, the thermostat controlling the electric heating element can be adjusted to the
appropriate water temperature utilizing the following thermostat markings:
Thermostat Marking Temperature, °F
Minimum 110
HOT 120
A 130
B 140
C 150
VERY HOT 160