White Rodgers 1F58-72 Operation Maintenance, Attach Thermostat to Subbase

ATTACH THERMOSTAT TO SUBBASE

1.Remove cover from thermostat base by gripping the base in one hand and with the fingers of the other hand, pull lightly at the top or bottom of the cover.

2.Carefully remove the shipping protective packing from the mercury switches.

3.Attach thermostat base to subbase. Be sure that all captive screws are tightened snugly, because they serve as electrical connections between thermostat and subbase (see fig. 4).

4.Snap cover onto thermostat and set temperature lever to desired setpoint. Turn on electrical power.

FAN			SYSTEM
AUTO	ON	COOL OFF HEAT EMER.
CHECK
LIGHT		G	Y
AUX		R		E
HEAT
	W2			B
EMER
HEAT		X1	L	O

Mounting screw	KEEP THIS AREA	Hole
	CLEAR OF WIRES!	in wall Mounting screw

Figure 3. Thermostat subbase

CHECK	AUTO		Mounting
		FAN	screws
LIGHT			ON
			COOLSYSTEM
			OFF	HEAT
AUX
HEAT
Captive terminal
screws
EMER
HEAT

50	60	70		Subbase
		80
		90	90	Captive terminal
				screws
			80
			70	Thermostat
			60
			50

Cover

Figure 4. Attach thermostat to subbase

OPERATION &

MAINTENANCE

The chart below shows the how the system functions when the system and fan switches are in various positions.

SUBBASE SWITCH POSITIONS

SYSTEM FUNCTION

FAN

SYSTEM

Emer

Aux

Fan

Rev

Heat

Heat

Compr.

Emer

Aux

COMPONENT OPERATION

Auto

On

Cool

Off

Heat

Emer

Relay

Valve

Relay

Relay

Contact

Light

Light

No heat - no cool - no fan - no lights

B

Heat Mode: stage 1 calling. Fan relay and com-

pressor contactor energized by thermostat.

Heat Mode: both stages calling. Fan relay, com-

B

pressor contactor, and auxiliary heat relay are

energized. Aux. light on.

Emergency Heat Mode: stage 1 calling. Emergency

G

B

heat relays energized. Compressor locked out at

thermostat. Emer. light on.

Emergency Heat Mode: both stages calling. Emer-

G

B

gency and auxiliary heat relays energized. Compres-

sor locked out at thermostat. Emer. and aux. lights on.

O

Cool Mode: Compressor contactor and fan relay

energized.

Fan relay energized. Fan runs continuously,

regardless of system switch position.

When check light is wired to a malfunction switch in

the heat pump system, check light will come on when

the malfunction switch contacts close, regardless of

system switch position.

Indicates switch position on thermostat subbase

O Reversing valve energized if connected to the O terminal.

and system function at those switch positions.

B Reversing valve energized if connected to B terminal.

G See fig. 2 (fan caution)

4