Rheem RHMV2421MNACJA Service Manual page 185

 Auxiliary heater control 1
Operation
Heater on
Heater off
• Temperature of heater on (Thon): Adjustable by function number 62 (Operating temperature
switching of external heaters).
• All control temperatures will shift by adjusting "Thon".
Tr-Ts ≥ -1.8°F
(-1°C)
Tr-Ts ≥ -18°F
(-10°C)
A
*: When room temperature stays in this zone for a specific time, auxiliary heater is turned on. For
details, refer to function number 71.
Example: When set temperature (Ts) is 72°F (22°C) (Factory setting),
• and room temperature (Tr) increases above 53.6°F (12°C), signal output is on.
• and room temperature (Tr) increases above 69.8°F (21°C), signal output is off.
• and room temperature (Tr) decreases below 66.2°F (19°C), signal output is on.
• and room temperature (Tr) decreases below 50°F (10°C), signal output is off.
 Auxiliary heater control 2
Control that excludes "A" from
Operation
Heater on
Heater off
• Temperature of heater on (Thon): Adjustable by function number 62 (Operating temperature
switching of external heaters).
• All control temperatures will shift by adjusting "Thon".
Tr-Ts ≥ -1.8°F
(-1°C)
*: When room temperature stays in this zone for a specific time, auxiliary heater is turned off. For
details, refer to function number 71.
4-4. Details of function
Heater is on as shown in following diagram of heating temperature.
• Heater is off as shown in following diagram of heating temperature.
• Other than heating mode
• Error occurred
• Forced thermostat off
• Fan stop protection
Tr-Ts
Off
Tr-Ts (=Thon) < -5.4°F (-3°C)
On
Tr-Ts < -21.6°F
Off
"Auxiliary heater control 1"
Heater is on as shown in following diagram of heating temperature.
• Heater is off as shown in following diagram of heating temperature.
• Other than heating mode
• Error occurred
• Forced thermostat off
• Fan stop protection
Tr-Ts
Off
*
Tr-Ts (=Thon) < -5.4°F (-3°C)
On
Condition
*
Tr: Room temperature
Ts: Set temperature
Thon: Heater on temperature
(-12°C)
on page 05-37.
Condition
- (05-37) -
Tr: Room temperature
Ts: Set temperature
Thon: Heater on temperature
4. External input and output