5188236-BIM-A-0316
Johnson Controls Unitary Products 55
area the roll-out switch will open, the ICB will close both the
main and pilot gas valves and flash a code (Table 31). The ICB
will not retry the ignition sequence during the same call for heat.
Flame Sense Circuit
The flame sensor is mounted on the left hand side of the burner
assembly and is positioned such that the pilot flame surrounds
the tip of the sensor. On a call for heat the ICB checks for the
flame sense circuit to be open. If open, then the ICB initiates the
purging and ignition sequence. Once the pilot flame is present,
the ICB monitors the flame sense circuit for pilot flame stability.
If the pilot flame is unstable or lost completely, then the ICB will
immediately close both the pilot and main gas valves. The ICB
will retry the purging and ignition sequence. If the flame is
unstable or lost more than 16 times during the same call for
heat, then the ICB will lock out furnace operation for 5 minutes.
Flash Codes or Error Messages
The UCB will initiate a flash code associated with errors within
the system. Refer to flash a code on the Simplicity Lite Control
(See Table 31) or sent error message to the LCD Simplicity SE
Control.
Resets
Remove the call for heating by lowering the thermostat setting
lower than the conditioned space temperature. This resets any
lock outs.
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 lowering of the temperature within the
conditioned space.
Start-up (Cooling)
Prestart Check List
After installation has been completed:
1. Check the electrical supply voltage being supplied. Be sure
that it is the same as listed on the unit nameplate.
2. Set the room thermostat to the off position.
3. Turn unit electrical power on.
4. Set the room thermostat fan switch to on.
5. Check indoor blower rotation.
• If blower rotation is in the wrong direction. Refer to
Phasing Section in general information section.
• Check blower drive belt tension.
6. Check the unit supply air (CFM). See “CHECKING
SUPPLY AIR CFM” on page 48.
7. Measure evaporator fan motor's amp draw.
8. Set the room thermostat fan switch to off.
9. Turn unit electrical power off.
Operating Instructions
1. Turn unit electrical power on.
2. Set the room thermostat setting to lower than the room
temperature.
3. Compressor will energize after the built-in time delay (five
minutes).
Post Start Check List
1. Verify proper system pressures.
2. Measure the temperature drop across the evaporator coil.
3. Measure the system Amperage draw across all legs of 3
phase power wires.
4. Measure the condenser fan amp draw.
Shut Down
1. Set the thermostat to highest temperature setting.
2. Turn off the electrical power to the unit.
Start-up (Gas Heat)
Pre-start Check List
Complete the following checks before starting the unit.
1. Check the type of gas being supplied. Be sure that it is the
same as listed on the unit nameplate.
2. Make sure that the vent and combustion air hoods have
been properly installed.
Table 23: Single Stage Gas Heat Limit Control Setting
Unit
(Tons)
Capacity, MBH Limit Control Opens, °F
Input Output Direct Drive Belt Drive
3 50 40 240 240
3 100 80 170 210
4 75 60 210 240
4 125 100 165 210
5 100 80 170 210
5 125 100 165 210
Table 24: 2 Stage Gas Heat Limit Control Setting
Unit
(Tons)
1st Stage
Capacity
2nd Stage
Capacity
Limit Control Opens,
°F
Input
(MBH)
Output
(MBH)
Input
(MBH)
Output
(MBH)
Direct
Drive
Belt
Drive
3 45 36 75 61 210 240
3 69 55 115 92 200 200
4 45 36 75 61 210 240
4 75 60 125 101 165 210
5 45 36 75 61 210 210
5 75 60 125 101 165 210
Table 25: Gas Heat Anticipator Setpoints
Gas Valve Anticipator Setpoints
Honeywell VR8204M 0.60 amp
White-Rogers 36E36 0.54 amp
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