– 10 –
P/N SCM2-0111
Model
SCM
Air to Water Heat Pump — Installation, Operation & Maintenance Manual
Section 6: electrical connections
(continued)
Figure 10
SpacePak Heat Pump/Chiller field wiring — Multiple air han-
dlers (see Figure 11, page 11 for ladder wiring diagram)
Multiple air handler applications
• See Figure 10, page 10.
• For multiple air handler applications, provide a
3-way valve to control water flow to the air handler.
• When the zone thermostat activates the SCM,
the valve will be activated by the SpacePak air
handler.
• The valve load must not exceed 20 va at 24
VAC. If the valve load is higher, connect a relay
coil to the air handler terminals. Feed 24 VAC
power to the valve through the relay from a
separate 24-VAC transformer.
• As an option, the air handlers can be installed on
secondary circuits with a zone pump for each air
handler.
