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826081-XIM-C-0214
Johnson Controls Unitary Products
35
area the rollout switch will open, the ICB will close both the
main and pilot gas valves and flash a code (Table 25). 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.
Resets
Remove the call for heating by lowering the thermostat setting
lower than the conditioned space temperature. This resets any
flash codes.
Heat Anticipator Setpoints
Gas Valve
Anticipator Setpoint
Honeywell VR8204M
0.60 amp
White-Rodgers 36E36
0.54 amp
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 flow rate. See “CHECKING
SUPPLY AIR FLOW RATE” on page page 30.
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.
Operating Instructions
TO LIGHT PILOT AND MAIN BURNERS:
1.
Turn “off” electric power to unit.
Table 21: Limit Control Setting
Unit
(Tons)
Capacity, MBH
Limit Control Opens, °F
Input
Output
Direct Drive
Belt Drive
3
15 (50)
12 (40)
115 (240)
-
4
22 (75)
18 (60)
99 (210)
-
5, 6.3
29 (100)
29 (80)
-
99 (210)
Table 22: Gas Heat Anticipator Setpoints
This furnace is equipped with an intermittent pilot and
automatic re-ignition system. DO NOT attempt to
manually light the pilot.