Spec Sheet

Single Phase Soft Starters
Page 9
Example Heat Pumps
Example
HP
Equipment
Tonnage
[kW]
No SureStart With SureStart
Normal
Operation
Accessory
Pumps
Normal
Operation
w/Accessory
Pumps
Continuous
Power
Starting
Amps
Starting
Power
Starting
Amps
Starting
Power
(A) (kW) (A) (kW)
(A) (A) (A)
(kW)
Column A Column B Column C Column D Column E
Model 026 2 [1.5] 52 6.8 18.2 2.4 7.4 1.0 8.4 1.7
Model 038 3 [2.2] 82 10.7 28.7 3.7 10.7 1.0 11.7 2.4
Model 049 4 [3.0] 96 12.5 33.6 4.4 14.3 2.0 16.3 3.4
Model 064 5 [3.7] 118 15.3 41.3 5.4 19.6 2.0 21.6 4.5
Model 072 6 [4.5] 150 19.5 52.5 6.8 22.2 2.0 24.2 5.0
Example Generators
Generator
Model Size
(kW)
Rated Output
(Running Amps)
240V 1ph
Residential Surge
Capability
(LRA @ 30%
Voltage Dip)
240V 1ph
Column F Column G
7 29 46
10 42 63
13 54 95
16 67 117
18 75 133
20 83 145
25 104 138
30 125 205
35 146 225
45 188 292
Generator Sizing Methods
If SureStart is used in systems which are powered
through an inverter setup fed from alternate renewable
energy sources like photovoltaic cells or generators, a
new installation will easily benefi t from lower demands
on inrush requirements through lower inverter and solar
panel sizing. Depending on kW rating of the installation,
this could easily lead to potential savings higher than
cost of the SureStart device itself.
The following are two methods of sizing the generator
to show the reduction effect of a SureStart upon
generator size in each method. These are for example
only and do not account for other potential equipment
loads such as lighting and appliances. It may be
advisable to average the two for the most conservative
approach. These are examples only and a professional
should select and size a generator for your home using
guidelines from the generator manufacturer.
Power (kW) Rating Method
Multiply the Power (kW) rating of the compressor by 2.5
times for the generator capacity required for SureStart
and 6 times without the SureStart.
Model 064 without SureStart:
Equipment kW = 3.7 therefore 3.7 kW * 6 = 22.2 kW
Generator Size kW (Column G) = 25 kW
Model 064 with SureStart:
Equipment kW = 3.7 therefore 3.7 kW * 2.5 = 9.3 kW
Generator Size kW (Column G) = 10 kW
So the reduction is over 60% with SureStart due to the
reduction in LRA.
Locked Rotor/Start Power Rating Method
When more detailed compressor data is available the
Locked Rotor/Start power method can be more precise.
Using locked rotor current and starting power, select a
generator by rounding up to the nearest generator size.
Model 064 without SureStart:
Startup Amps (Column A) = 118, Start Power (Column B)
= 15.3 kW
Generator Size kW (Column G) = 16 kW with 117 amp
LRA capability.
Model 064 with SureStart:
Startup Amps (Column C) = 41.3, Start Power (Column D)
= 5.4 kW
Generator Size kW (Column G) = 7 kW with 46 amp
LRA capability.
So the reduction is a little more than 50% with SureStart
due to the reduction in LRA.
Warning! Always consult with the generator
manufacturer for specifi c sizing guidelines.