Johnson Controls TM9V*MP installation manual Danger, UIM-C-0712, Adjustment Of Temperature Rise

701379-UIM-C-0712

ADJUSTMENT OF TEMPERATURE RISE

DANGER

The temperature rise, or temperature difference between the return air and the supply (heated) air from the furnace, must be within the range shown on the furnace rating plate and within the application limitations shown in Table 7 “ELECTRICAL AND PERFORMANCE DATA”.

The supply air temperature cannot exceed the “Maximum Supply Air Temperature” specified in these instructions and on the furnace rating plate. Under NO circumstances can the furnace be allowed to operate above the Maximum Supply Air Temperature. Operating the furnace above the Maximum Supply Air Temperature will cause pre- mature heat exchanger failure, high levels of Carbon Monoxide, a fire hazard, personal injury, property damage, and/or death.

After about 5 minutes of operation, determine the furnace temperature rise. Take readings of both the return air and the heated air in the ducts, about six feet (1.83 m) from the furnace where they will not be affected by radiant heat. Increase the blower speed to decrease the temperature rise; decrease the blower speed to increase the rise.

VARIABLE SPEED MOTORS

The variable speed motor must be configured so the blower will provide a sufficient airflow so that the furnace operates with in the temperature rise range on the rating plate and within the application limitations shown in Table 7 in these Instructions.

ADJUSTMENT OF FAN CONTROL SETTINGS

Heating Indoor Fan Off Delay

This furnace is equipped with a time-on/time-off heating fan control. The fan on delay is fixed at 30 seconds. The fan off delay has 4 settings (60, 90, 120 and 180 seconds). The fan off delay is factory set to 120 sec- onds. The fan-off setting must be long enough to adequately cool the furnace, but not so long that cold air is blown into the heated space. The fan-off timing may be adjusted by positioning the jumper on two of the four pins as shown in Figure 41.

BLOWER OFF	HI HEAT DELAY	CONTINUOUS FAN
	JUMPER
DELAY JUMPER		SPEED JUMPER

LAST

CFM

STATUS

STAGING

SPEED FAN VSHI HI LO LO

NEUTRALS

ERROR

180

120

15 10 OFF 60 90

20

LOW VOLTAGE

TERMINALS

Y1

Y Y2

W W1

W2

HUM

R

LINE

G

C

XFMR

BLOWER SPEED

O

JUMPERS

EAC

DHUM

X/L

ADJ COOL RELAY HEAT

HEAT

D

D

D

YES

C

C

C

B

B

B

PUMP

A

A

A

NO

DHUM?

JUMPER

HEATPUMP

DEHUMIDISTAT

COOLING

JUMPER

PROFILE JUMPER

FIGURE 42: Furnace Control Board

Johnson Controls Unitary Products 33