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ZH 036, 048, 060
Electrical Connections
POWER SUPPLY
Do not apply power or close disconnect switch until
installation is complete. Refer to start-up directions. Refer
closely to unit wiring diagram.
Refer to unit nameplate for minimum circuit ampacity
and maximum fuse size.
1- Units are factory-wired for 240, 460, or 575 volt supply.
For 208V supply
, remove the insulated terminal cover
from the 208V terminal on the control transformer. Move
the wire from the transformer 240V terminal to the 208V
terminal. Place the insulated terminal cover on the
unused 240V terminal.
2- Route power through the side or bottom power
entry area. For bottom power entry, a bottom
power entry kit must be used. Connect power
wiring to K1/K3 contactors in control box. See
figure 7. On units equipped with electric heat, route
power wiring to TB2; see parts arrangement for
location. See unit wiring diagram.
K1
FIGURE 7
POWER WIRING
CONNECT FIELD-
SUPPLIED WIRING
TO K1/K3
K3
Y, G, J, M
VOLT ONLY
CONTROL WIRING
A - Thermostat Location
Room thermostat mounts vertically on a standard 2” X 4”
handy box or on any non-conductive flat surface.
Locate thermostat approximately 5 feet (1524 mm)
above the floor in an area with good air circulation at
average temperature. Avoid locating the room
thermostat where it might be affected by:
-drafts or dead spots behind doors and in corners
-hot or cold air from ducts
-radiant heat from sun or appliances
-concealed pipes and chimneys
IMPORTANT - Unless field thermostat wires are rated
for maximum unit voltage, they must be routed away
from line voltage wiring.
B - Control Wiring
1- Route thermostat cable or wires from subbase to
control panel (refer to unit dimensions to locate
bottom and side power entry).
Use18 AWG wire for all applications using remotely
installed electro-mechanical and electronic
thermostats.
2- Install thermostat assembly in accordance with
instructions provided with thermostat.
3- Connect thermostat wiring to low voltage leads in
control box. Wire as shown in figure 8 for
electro-mechanical and electronic thermostats. If
using other temperature control devices or energy
management systems see instructions and wiring
diagram provided by manufacturer.
IMPORTANT-Terminal connections at the wall plate or
subbase must be made securely. Loose control wire
connections may allow unit to operate but not with proper
response to room demand.
FIGURE 8
24 VOLT FIELD WIRING WITH ELECTRONIC AND
ELECTRO-MECHANICAL THERMOSTATS
TO CMC1; DO NOT
REMOVE FACTORY
INSTALLED WIRES
NOT ALL TERMINALS
ARE FOUND ON ALL
THERMOSTATS
Note - On electro-mechanical thermo
stats set anticipator at 0.1 amps.
Jumper terminals R and
OC when thermostat has
no night setback terminals.
A2 THERMOSTAT
UNIT CONTROL AREA
