Steffes ThermElect Hydronic 9150 Instruction Manual

Technical Data Sheet
9100 ThermElect Hydronic
Models 9150 and 9180
2-Year Limited Manufacturer’s Warranty
Stees | 3050 Highway 22 North | Dickinson, North Dakota 58601-9413 | 701-483-5400 Rev 3
Clearances and Dimensions
Storage Module (53kW and 80kW)
• Back = 8 inches
• Bottom = 1 inch (from combustible material)
• Right Side = 12 inches
• Top = 8 inches (from combustible material)
• Left Side & Front = 36 inches (for ease in servicing)
Adhere to clearances and provide appropriate
ventilation to maintain no greater than 85oF air
temperature in area where unit is installed.
Some electrical codes may require a greater
front clearance depending on operating
voltages and other factors.
Placement
The minimum area required for the installation of the system is 100 square feet per unit. This area must remain free of
debris and room air should be maintained at less than 85o Fahrenheit / 29o Celsius. It is the responsibility of the installer
and system designer to provide appropriate ventilation to control temperature in area where unit is placed.
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51"
9180 - 98"
9150 - 77"
40 1
16"
80KW
STORAGE
MODULE
34"
12" MINIMUM
CLEARANCE
8" MINIMUM
CLEARANCE
36" MINIMUM
CLEARANCE
36" MINIMUM
CLEARANCE
12" MINIMUM
CLEARANCE
8" MINIMUM
CLEARANCE
36" MINIMUM
CLEARANCE
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1"
CLEARANCE
REQUIRED
NOTE:

Load Management
The ThermElect is a commercial Electric Thermal Storage (ETS) heating system. It uses Demand Free, O-Peak electricity to
provide a low cost heating solution for commercial, industrial, and large residential applications. ETS equipment is designed to
store electricity, as heat, during hours when energy costs are lower and kW demand charges are not incurred. The ThermElect’s
thermal mass consists of a high-density ceramic brick capable of vast heat storage.
The ThermElect system is designed to operate under any one of three load control strategies.
1. On-Peak/O-Peak Signal: ThermElect responds to external load control device (contact closure) and charges during
o-peak periods. Auxiliary contact is provided on the ThermElect for controlling external loads. If using the Stees
Time Clock Module for peak control, the direct wiring shown here is not necessary.
2. 4-20 Milli-Amp (1-5 Volt DC): ThermElect responds to external load management device and monitors energy usage
so as not to exceed the maximum allowable rate of consumption (kW).
3. Pulse Monitoring: ThermElect monitors pulse inputs from the power company’s electric meter and proportionally
charges when demand free power is available.
Typical System Plumbing
Single Temperature Zone Multiple Temperature Zone
NOTE: There are many additional ways to connect plumbing and regulate temperature from the primary loop onward.
Utility On-Peak/O-Peak Connections
Terminal Block Code Designations
RP = Peak Control Input Common
P = Peak Control Input
AP = Anticipated Peak (Pre-Peak) Control Input
COM = Peak Control Output Common
NC = Peak Control Output (Normally Closed)
NO = Peak Control Output (Normally Open)
4-20 Milli-Amp or
Pulse Monitoring
Connections -
-
-
- +
Aux Duct
+ ++
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Pulse
4-20ma Not
Used
Duct
Sensor

Low Voltage Wall Thermostat, Sensor, and Compressor Connections
• A low voltage (24VAC) room thermostat
can be used for room temperature
control with the ThermElect Hydronic
system. If so, Stees recommends using
a digital thermostat. To initiate a heat call,
the system needs a switch closure from
R to H. This energizes the primary loop
pump outputs.
• In heat pump applications, the Honeywell
brand thermostat is recommended and
shown in the wiring schematic.
• An outdoor temperature sensor is
included with the system to provide
outdoor temperatures for automatic
charge control (regulation of stored heat).
Heat Pump Application
Terminal Block Code Designations
R= Low Voltage Hot
C = Low Voltage Common
Y= Compressor/Stage 1 Heat Call
Y2 = Compressor Output
G= Fan Call
O = Reversing Valve Input
O2 = Reversing Valve Output
W = Stage 2 Heat Call
H = Hydronic Heat
OS = Outdoor Temperature Sensor
SC = Outdoor Temperature Sensor Common
DS = Duct Temperature
Hydronic Heating Single Zone System
Primary Water Loop Plumbing
The ThermElect Hydronic System must be plumbed with a
primary water loop consisting of a minimum of 12’ of 1.25”
pipe and its own circulatory pump. The primary loop serves
to regulate heat transfer from the unit’s heat exchanger.
Primary loop must be powered by ThermElect control system
as shown in gure on the right.

Specications
Stees | 3050 Highway 22 North | Dickinson, North Dakota 58601-9413 | 701-483-5400 Rev 3
Model 9150
53kW Storage Module
Model 9180
80kW Storage Module
Input Voltage 277/480 347/600 277/480 347/600
Phase 3 3 3 3
Number of Wires 4 4 4 4
Charging Input (kW) 50.4 53.3 75.6 80.0
Elements - Quantity
Elements - Watts Each
12
4,200
12
4,444
18
4,200
18
4,444
Amps - Core Charging 60.65 51.23 90.97 76.84
Max. Pump & Blower Load (AMPS)
Tentative 2.3 1.9 2.3 1.9
Minimum Circuit Ampacity 78.69 66.41 116.59 98.43
Blowers/System Control Voltage*240V/208V
Storage Capacity - kWh***
Storage Capacity - BTU
290
989,480
440
1,501,280
Pipe Size (Inlet/Outlet) 1 ½”
Required Primary Loop Minimum of 12’ of 1 ½” pipe required in primary loop plumbing
Output Water Temperature
(selection range) 50oF to 185oF
Maximum Working Pressure
20 PSIG requires 30 PSI Pressure Relief Valve
60 PSIG requires 75 PSI Pressure Relief Valve (Standard)
125 PSIG requires 150 PSI Pressure Relief Valve
Flow Rate (Primary Loop) 1 GPM per 10,000 BTU of required output at 20oF Temperature Rise
(Not to exceed 30 GPM)
Internal Pressure Drop
(assuming 50% glycol mix)
.7 ft @ 15 GPM 1.8 ft @ 25 GPM
1.2 ft @ 20 GPM 2.5 ft @ 30 GPM
Approximate Heater Module Weight
(lbs) 900 970
Approximate Insulation
Block/Elements/Other Weight (lbs) 330 400
Approximate Brick Weight (lbs) 3,440 5,160
Number of Brick 192 288
Approximate Installed Weight (lbs)** 4,670 6,530
* Supply via step-down transformer - eld installation.
** Add approximately 500 lbs to arrive at shipping weight.
*** Storage capacity is based on a maximum core temperature of 1,400 degrees Fahrenheit.