Heating Operation Errors

356214-XIM-A-0108

on delay for heating, the UCB will energize the blower motor.

If the second stage of heat is required, heater con- tactor (7M) will be energized. Note that on the 54 KW, 240V heater, heater contactors (7M & 8M) will be energized and on the 72 KW, 240V heater, heater contactors (8M & 9M) will be energized. After completing the specified fan on delay for heating, the UCB will energize the blower motor.

b.The thermostat will cycle the electric heat to satisfy the heating requirements of the conditioned space.

NOTE: All 50 Hz heaters are provided with manual reset backup protection limits. These will de- energize the heaters should the primary limit fail to open or the contactors fail to open in a failure mode.

TEMPERATURE LIMIT

If the UCB senses zero volts from the high temperature limit, the indoor blower motor is immediately energized.

This limit is monitored regardless of unit operation sta- tus, i.e. the limit is monitored at all times.

If the temperature limit opens three times within one hour, it will lock-on the indoor blower motor and a flash code is initiated (See Table 24).

SAFETY CONTROLS

The unit control board monitors the temperature limit switch of electric heat units.

The control circuit includes the following safety con- trols:

1.Temperature Limit Switch (TLS 1, 2).

This control is located inside the heater compart- ment and is set to open at the temperature indi- cated in the Limit Control Setting Table 19. It resets automatically. The limit switch operates when a high temperature condition, caused by inadequate supply air flow occurs, thus shutting down the heater and energizing the blower.

2.Temperature Limit Switch (TLS 3, 4, 5 and 6).

This control is located inside the heater compart- ment and is set to open at the temperature indi-

cated in the Limit Control Setting Table 19. It is a manual reset limit. These limit switches will de- energize the heaters should the primary limit fail to open or the contactors fail to open in a failure mode.

TABLE 19: LIMIT CONTROL SETTING

UNIT		HEATER	TEMPERATURE LIMIT	TEMPERATURE
UNIT	VOLTAGE	HEATER	SWITCH 1, 2	LIMIT SWITCH 3, 4, 5,
(Tons)		kW	OPENS, ºF	6 OPENS, ºF
			OPENS, ºF	6 OPENS, ºF

		18	120	170

15, 20,	415	36	120	170
15, 20,
25
		54	120	170



		72	120	170

FLASH CODES

The UCB will initiate a flash code associated with errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 24.

RESET

Remove the call for heating by lowering the thermostat setting lower than the conditioned space temperature. This resets any flash codes.

HEAT ANTICIPATOR SETPOINTS

It is important that the anticipator setpoint be correct. Too high of a setting will result in longer heat cycles and a greater temperature swing in the conditioned space. Reducing the value below the correct setpoint will give shorter "ON" cycles and may result in the low- ering of the temperature within the conditioned space. Refer to Table 20 for the required heat anticipator set- ting.

TABLE 20: ELECTRIC HEAT ANTICIPATOR SETPOINTS

HEATER	VOLTAGE	SETTING, AMPS
KW	VOLTAGE	TH1	TH2
KW		TH1	TH2
18		0.29	-
36	380/415-3-50	0.29	0.29
54	380/415-3-50	0.29	0.29
54		0.29	0.29
72		0.29	0.29

GAS HEATING SEQUENCE OF OPERATIONS

The following sequence describes the operation of the gas heat section.

Johnson Controls Unitary Products

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