Johnson Controls AV*(C) Series installation manual Section VII Line Power Connections

536636-UIM-D-1211

TABLE 5: Heat Relays
Input	Heat Relay Output
W1	HT1
W2	HT1 and HT2
W1 and W2	HT1 and HT2 and HT3

The control energizes the first stage of electric heat immediately, the second stage 10 seconds after the call for second stage heat, and the third stage 20 seconds after the call for third stage heat.

Depending on the heat kit installed in the air handler, the control pro- vides the flexibility to configure the amount of heat delivered with the first stage heating call. As an example, when the control’s W1 input is connected to the room thermostat’s first stage heat signal, a call for first stage heat will energize one heating element (HT1). If the control’s W2 input is connected to the room thermostat’s first stage heat signal, a call for first stage heat will energize two heating elements (HT1 and HT2). With either configuration, the control will energize three heating ele- ments (HT1, HT2, and HT3) when it receives a first and second stage heat input from the thermostat.

Limit Switch and Lockout Operation

Limit Switch Operation

If the HEAT ENABLE jumper is in the HEAT position and the limit switch opens (fault code 1), the control will immediately de-energize all electric heat relay outputs and energize the blower (if it wasn’t already ener- gized). When the limit switch closes, the control will re-energize electric heat according to the thermostat inputs using normal timings.

Fan On Lock Condition

If the limit switch opens multiple times during a single call for electric heat (fault code 3) or if the limit switch opens for a long duration (fault code 4), the control will energize the blower until power is removed from the control. The control will cycle the heat outputs on and off as the limit re-closes and opens. The constant fan operation will signal the home- owner that a problem has occurred and a service call is required.

Soft Lockout

If the limit switch opens for a second long duration period during a sin- gle call for heat (fault code 5), the control will keep the blower locked on and lock out the heat outputs for one hour. The control will only reset this one hour lockout when the power is removed from the control. After the one hour period has passed, the control will re-energize electric heat according to the thermostat inputs using normal timings. The blower will remain locked on from the first long duration limit opening.

Hard Lockout

The control has a hard lockout condition during which the control will keep all heat outputs de-energized until power is removed from the con- trol. The control de-energizes the blower five minutes after entering the hard lockout condition.

If the limit switch closes and re-opens during the one hour soft lockout period, the control will enter a hard lockout condition and continue to indicate a fault code 5.

If the limit switch opens twice when no call for electric heat is present (fault code 2), the control will enter a hard lockout condition.

If the limit switch opens multiple times soon after a soft lockout reset (fault code 6), the control will enter a hard lockout condition.

Wiring Related Faults

If the control receives a simultaneous call for heating and cooling (fault code 7), the control will perform both heating and cooling operations.

SECTION VII: LINE POWER

CONNECTIONS

Power may be brought into the unit through the supply air end of the unit (top when unit is vertical) or the left side panel. Use the hole appro- priate to the unit’s orientation in each installation to bring conduit from the disconnect. The power lead conduit should be terminated at the electrical control box. Refer to Tables 11, 12, 14 and 15 to determine proper wire sizing. To minimize air leakage, seal the wiring entry point at the outside of the unit.

All electrical connections to air handlers must be made with copper con- ductors. Direct connection of aluminum wiring to air handlers is not approved.

If aluminum conductors are present, all applicable local and national codes must be followed when converting from aluminum to copper con- ductors prior to connection to the air handler.

If wire other than uncoated (non-plated), 75° C ambient, copper wire is used, consult applicable tables of the National Electic Code (ANSI/ NFPA 70). The chosen condutor and connections all must meet or exceed the amperage rating of the overcurrent protector (circuit breaker or fuse) in the circuit.

Additionally, existing aluminum wire within the structure must be sized correctly for the application according to National Electric Code and local codes. Caution must be used when sizing aluminum rather than copper conductors, as aluminum conductors are rated for less current than copper conductors of the same size.

TYPICAL WIRING WITHOUT ELECTRIC HEAT

GND. LUG	GND.
	LUG

POWER

SUPPLY

1 PHASE ELECTRIC HEAT

WITH CIRCUIT BREAKER

& BREAKER BAR REMOVED

MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN

GND. LUG	GND.
	LUG
POWER
SUPPLY 1
POWER
SUPPLY 2
POWER
SUPPLY 3
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS

ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

3 PHASE (10 - 15 KW)

GND. LUG	GND.
	LUG
POWER
SUPPLY	TERMINAL
	BLOCK
ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

SINGLE SOURCE (2.5 - 10 KW)

GND. LUG	GND.
	LUG
POWER
SUPPLY
	TERMINAL
	BLOCK

CONNECT TRANSFORMER LEADS WITH WIRE NUTS (TYPICAL ALL HEAT KITS)

1 PHASE ELECTRIC HEAT WITH CIRCUIT BREAKER AS SHIPPED FROM FACTORY SINGLE SOURCE

(2.5 - 25 KW) - 25 KW SHOWN

GND. LUG	GND.
	LUG

POWER

SUPPLY

(JUMPER BAR)

MAY BE 1, 2, OR 3

CIRCUIT BREAKERS

POWER WIRING (208/230-1-60)

FIGURE 15: Line Power Connections

Johnson Controls Unitary Products 11