5300477-UIM-A-0317
12
Johnson Controls Unitary Products
Delay Profiles
The Delay Profiles are shown in Table 15 for each Delay jumper set-
ting.
The levels shown in the Pre-Run, Short-Run, and Run Periods are a
percentage of the blower speed corresponding to the thermostat call.
The Post-Run and Off Delay levels are derived from the level of the pre-
vious state, not the blower speed corresponding to the thermostat call.
If in Delay Profile B and in the Short-Run Period (82% of capacity) and
the thermostat call is removed, this causes the control to enter the Post-
Run state. The Post-Run state level for Delay Profile B is 100% of the
previous level, so the level during the Post-Run state is 82%.
HEATING SEQUENCE OF OPERATION
(Units equipped with optional electric heat kit)
1.
On a call for heating, the wall thermostat sends a 24V “W” signal to
“W1” on the unit. The indoor blower then runs at the selected heating
speed. The 24V signal also goes to the sequencer(s) or relays in the
electric heat kit and turns on the electric heating elements. All 6HK
460V heat kits are single stage and only need an input on the “W1”
connection. A 24VAC input on “W2” has no functionality.
2.
When the demand for heating is removed, the wall thermostat
removes the “W” signal. When the 24V signal is removed from the
electric heat kit, the heating elements turn off. The indoor blower
continues to run until the electric heat blower off time delay expires.
This function is built into the indoor blower control board.
3.
See Table 9 for blower off delay times.
Electric Heat Limit Switch Operation
The 6HK three phase heat kits utilize a normally closed fusible link. If
the fusible link opens, it must be replaced with the appropriate OEM
part and the cause must be investigated and corrected. The 460V 6HK
three phase heat kit limit switch(s) is an auto reset low voltage switch
that disconnects the line voltage power to the heat kit elements if an
over-temperature condition should occur.
Table 11:
Delay Profile Descriptions
Delay
Profile
Period
Cooling
Level%
Time in State
(Minutes)
A
Pre-Run
Bypass
Bypass
Short-Run
Bypass
Bypass
Run
100
No Limit
Post-Run*
100
1
Off Delay*
Bypass
Bypass
B
Pre-Run
50
2
Short-Run
82
5
Run
100
No Limit
Post-Run*
100
1
Off Delay*
Bypass
Bypass
C
Pre-Run
Bypass
Bypass
Short-Run
Bypass
Bypass
Run
100
No Limit
Post-Run*
100
1
Off Delay*
50
1
D
Pre-Run
Bypass
Bypass
Short-Run
63
1.55
Run
100
No Limit
Post-Run*
100
1
Off Delay*
63
0.5
Table 12:
Thermostat Signals
Signal
State
Board Function
G
ON
Indoor blower instant on
OFF
Indoor blower off
W1
ON
Indoor blower instant on
Electric heat first stage on (if so equipped)
OFF
Electric heat first stage off (if so equipped)
Indoor blower off after off delay
G & W1
ON
Indoor blower instant on in heating speed
Electric heat first stage on (if so equipped)
W OFF
Electric heat first stage off (if so equipped)
Indoor blower switches to continuous fan speed
G & Y1
ON
Outdoor fan instant on
Indoor blower instant on in LOW cooling speed
Compressor on
Y1 OFF
Compressor instant off
Outdoor fan instant off
Indoor blower switches to continuous fan speed
after 60 seconds
G & Y1
OFF
Compressor instant off
Outdoor fan instant off
Indoor blower off after 60 second delay
Table 13:
Recommended Blower Speed for Electric Heat
Model
Heater kW
10
15
18
20
25
PCE6B36
C (ML)
A (HI)
--
--
--
PCE6B48
D (LO)
C (ML)
B (MH)
A (HI)
--
PCE6B60
D (LO)
D (LO)
C (ML)
B (MH)
A (HI)
NOTES:
The recommended HEAT speed selections above will give approximately a 45 degree temperature rise at 0.3" static with 460V power supply. If lower or higher
heating airflow is desired, or if duct static or voltage are different than specified, other speed taps may be used.
