Johnson Controls AV*(C) Series Section Iv Electric Heater Installation, Drain Connections

536636-UIM-D-1211

DRAIN CONNECTIONS

All drain lines should be trapped a minimum of three inches, should be pitched away from unit drain pan and should be no smaller than the coil drain connection.

For Upflow, Downflow and Horizontal right hand applications the kits can be installed without modification.

Field modification is required for Horizontal left hand airflow application only. Follow instructions with heater kits for modification.

Threaded drain connection should be hand-tightened, plus no more than 1/16 turn.

Route the drain line so that it does not interfere with accessibility to the coil, air handling system or filter and will not be exposed to freezing temperatures. See Figures 2 and 3 for drain connection locations.

NOTICE

When the coil is installed in an attic or above a finished ceiling, an auxiliary drain pan should be provided under the coil if specified by local building codes.

Coils should be installed level or pitched slightly toward the drain end. Suggested pitch should not exceed 1/4 inch per foot of coil.

The coil is provided with a secondary drain that should be trapped and piped to a location that will give the occupant a visual warning that the primary drain is clogged. If the secondary drain is not used it must be capped. When an exterior secondary drain pan is used that secondary drain should br piped to a location that will give the occupant a visual warning that the primary drain is clogged.The drain pan connections are designed to ASTM Standard D 2466 Schedule 40. Use 3/4" PVC or steel threaded pipe. Since the drains are not subject to any pressure it is not necessary to use Schedule 40 pipe for drain lines.

DO NOT use teflon tape, “pipe dope” or other sealants. The use of a sealant may cause damage and premature failure of hte drain pan

SECTION IV: ELECTRIC HEATER INSTALLATION

If the air handler requires electric heat, install the electric heat kit according to the installation instructions included with the kit. After installing the kit, mark the air handler nameplate to designate the heater kit that was installed. If no heater is installed, mark the name plate appropriately to indicate that no heat kit is installed.

The HEAT/ENABLE jumper (See Figure 10) must be moved to the HEAT position to enable operation of the heater.

Use only 4HK heater kits, as listed on Air Handler name plate and in these instructions. Use data from Tables 10 and 13 for information on required minimum motor speed tap to be used for heating operation, maximum over-current protection device required and minimum electri- cal supply wiring size required – for listed combination of Air Handler and Heater Kit.

NOTICE

If a heat kit with a circuit breaker is installed in the air handler, the cir- cuit breaker cover cladding must be removed to gain access to the sheet metal cover plate. Some local codes may require that the circuit breaker remain visible. If so, do not re-install circuit breaker cover cladding.

SECTION V: LOW VOLTAGE CONTROL CONNECTIONS

This air handler can be connected to the wall thermostat and outdoor air conditioner or heat pump using either conventional low voltage (24 VAC) thermostat wiring OR using four-wire digital communications wir- ing. To use conventional low voltage wiring, see the section below enti- tled “Conventional Low Voltage Control Wiring”. To use four-wire communications control wiring, see the section below entitled “Control Wiring using Communicating Controls”.

The Communicating System consists of several intelligent communicat- ing components including the Communicating Thermostat Control (touch-screen wall thermostat), variable speed air handler, air condi- tioner (15 and 18 SEER premium air conditioners) or heat pump (13, 15 and 18 SEER premium heat pumps), which continually communicate with each other via a four-wire connection called the A-R-Gnd or C-B bus. Commands, operating conditions, and other data are passed con- tinually between components over the A-R-Gnd or C-B bus. See Figure 13. The result is a new level of comfort, versatility, and simplicity.

In order to use this air handler in full communications (COMM) mode, it MUST be installed with the matching touch-screen Communicating Control (wall thermostat) and an outdoor air conditioner or heat pump with a fully communicating control.

This air handler may also be used along with the Communicating Ther- mostat Control and a non-communicating outdoor air conditioner through the addition of a communicating Outdoor Aux Control board to the outdoor unit. This system allows full communication between the air handler and thermostat and limited communication to the outdoor unit.

This air handler may also be used along with the Communicating Ther- mostat Control and a non-communicating outdoor air conditioner or heat pump using COMM between the air handler and thermostat and conventional 24V wiring to the outdoor unit. This system allows full communication between the air handler and thermostat but no digital communication with the outdoor unit. See Figure 14.

HEAT ENABLE JUMPER

HUMIDIFIER OUT PUT

THERMOSTAT CONNECTIONS

EAC OUTPUT

AC/HP JUMPER

HUMIDSTAT

JUMPER

BLOWER SPEED JUMPERS

SPARE JUMPER

CONTINUOUS FAN JUMPER

FIGURE 11: Air Handler Control Board – Communications Connections

Johnson Controls Unitary Products 7