Page 53
All wiring connections are made by jackplug connec
tions to the commercial controls harness in unit (see fig
ures 61 and 62). Plug P4 in the economizer connects to
Jack J3 in the unit to make connection.
The night kit is used only with the C11 wiring diagram.
It cannot be used with any other control system op
tions or control damage will result. This system is de
signed for use with optional CMC3-1 time clock and
night thermostat.
Night (setback relay) kit allows CHA16 units without
REMD16M economizer to automatically set back"
the thermostat to reduce energy consumption during
times when the building is not occupied. The night kit
achieves this by disconnecting thermostat S1 and
connecting a night thermostat during periods when
the building is not occupied. The night thermostat can
then be adjusted with a lower setpoint as needed for
unoccupied heating.
FIGURE 61
J3
NIGHT KIT
PLUG P4
NIGHT KIT RELAY
NIGHT KIT INSTALLED IN FILTER
SECTION OF 12.5 TON AND SMALLER UNITS
FIGURE 62
J24
J3
J33
NIGHT KIT
PLUG P4
NIGHT KIT RELAY
NIGHT KIT INSTALLED IN FILTER
SECTION OF 15 TON AND LARGER UNITS
6 - C3 Wiring Diagram
Flexstat L2F-N for units without economizer or warm-
up. Setback is built in. Wiring connections are made
to the unit's low voltage terminal strip.
NOTE - Flexstat (C3 and C4 diagrams) was discontin
ued as a control system option in July 1989 and is not
shown in the CHA16-1853. However, Flexstat remains
a valid matchup to commercial CHA16 units of all sizes
until inventories are depleted. You may find some
CHA16-1853 units using it.
7 - C4 Wiring Diagram
Flexstat L2F-N is for units with an economizer and
warm-up. Setback is built in. Thermostat wiring con
nections are made to unit's low voltage terminal strip
while warm up kit plugsin" to the unit's control har
ness.
8 - C5 Wiring Diagram
Prostat T5010 for units without economizer or warm-
up. Setback is built in. Wiring connections are made
to the unit's low voltage terminal strip.
9 - C6 Wiring Diagram
Prostat T5010 for units with economizer and warm-
up. Setback is built in.Thermostat wiring connections
are made to the unit's low voltage terminal strip while
the warm up kit plugsin" to the unit's control harness
10 - C7-3 Wiring Diagram
W7400 control system for units. See figure 6463. Re
quires W7400 relay kit and economizer. Warm up and
setback are built in. Thermostat T7400 wiring con
nections are made to the unit's low voltage terminal
strip. W7400 control module jackplugs J17/P17
connect to the unit control harness at jackplug
J16/P16. W7400 relay kit plug P5 connects to unit
jack J3 and relay kit jack J5 connects to warm up kit
plug P8. Another plug equipped in the W7400 relay
kit, Jackplug J23/P23, is used in LVAV applications
only.
WARNING
Connect only relay kits designed for this control
system. Relay kits designed for other control sys
tems are not compatible and control damage or
failure will result. For example, do not connect a
w973 relay kit to this control system.
The W7400 is used only with the C73 control system
option. It cannot be used with any other control sys
tem option or control damage will result.
FIGURE 64
W7400
CONTROL SYSTEM
Control Module
Relay Kit
J17
P17
J5
P5
J23/P23
LVAV
APPLICATION
ONLY
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