TW Series Water to Water
 Polybutylene or Polyethelene with insulation
 Ground loop pumping package (GLP)
 Ground loop connection kit.
 P/T Plugs
Load side connection
low voltage control connection
 Vibration Pad
 Line Voltage disconnect
After completing the installation, and before energizing
the unit, the following system checks should be made:
Verify that the supply voltage to the heat pump is in
accordance with the nameplate ratings.
Make sure that all electrical connections are tight
Check the electrical fusing and wiring for the correct
DANGER: Ensure cabinet and Electrical Box
are properly grounded.
Verify that the low voltage wiring between the
thermostat and the unit is correct.
Verify that the water piping is complete and correct.
Check that the water flow is correct, and adjust if
Figure # 11
Verify that vibration isolation has been provided.
Unit is serviceable. Be certain that all access panels
are secured in place.
Always check incoming line voltage power supply
and secondary control voltage for adequacy.
Transformer primaries are dual tapped for 208 and
230 volts. Connect the appropriate tap to ensure a
minimum of 18 volts secondary control voltage. 24
volts is ideal for best operation.
Long length thermostat and control wiring leads
may create voltage drop. Increase wire gauge or up-
size transformers may be required to insure
minimum secondary voltage supply.
We recommends the following guidelines for wiring
between a thermostat and the unit: 18 GA up to 60
foot, 16 GA up to 100 ft and 14 GA up to 140 ft.
Do not apply additional controlled devices to the
control circuit power supply without consulting the
factory. Doing so may void equipment warranties.
Check with all code authorities on installation
System Checkout | 15