Bulletin 30-015.003
Copyright © 2017 Unico Inc.
Page 9
Water Connections
If you are installing the hot water coil, remove the side
coil access panel. Slide the coil into the cabinet if not
already installed at the factory and reinstall the door
panel. After removing plugs in the inlet and outlet holes,
caulk around connections to prevent leakage.
IL00176a.cvx
TO BOILER
COIL
FROM PUMP/BOILER
VENT
DRAIN
COIL
BOILER \ WATER
HEATER
Figure 13 Water Piping Schematic
Pump and pipe sizing should be based on proper flow
rate. Refer to Bulletin 20-019 for water coil capacities
based on flow rate.
Sweat the water connections, then fill the system. Install
a vent valve at the highest point and a drain valve at the
lowest point of the water system (refer to Fig. 11). Fill
and bleed the air from the system. If unit is in an
unconditioned space care must be taken to prevent the
water from freezing. Use a glycol-water antifreeze
solution with a freezing point below the coldest
temperature expected
As an alternate to an anti-freeze solution, the water can
be continuously circulated to prevent freezing. If the
coil will not be used for an extended period of time
during cold temperatures, drain the system then flush
with a glycol solution.
Wiring
WARNING!
DISCONNECT ELECTRICAL SUPPLY BE-
FORE WIRING UNIT TO PREVENT
INJURY OR DEATH FROM ELECTRICAL
SHOCK.
All electrical wiring must comply with all local codes
and ordinances. Make electrical connection in
accordance with the wiring diagram shown in Fig. 12.
Refer to separate control box manual for additional
wiring instructions.
The vertical unit uses the EC motor and SCB control as
standard. The vertical unit is sold as 230V or 115V
power. The wiring schematic in this manual is for 230V.
For 115 V wiring, refer to the control box manual. Use
a separate 1ph, 60/50 Hz power supply with a 15 amp
fuse or breaker and appropriate wire gauge per local
code.
1.
Connect the power supply to terminals L1 and L2/N
of the terminal block.
The low voltage transformer is factory wired for a
primary voltage of 230V. If power supply is 208V,
move the switch on the control board to the 208
setting.
2.
Connect the ground to the ground terminal.
3.
Plug the motor cable to the motor.
4.
Connect the anti-frost wires if using a refrigerant
coil.
5.
Connect the thermostat wires.
6.
Connect the condensing unit wires.
